Adds a better diff design and removes the select and copy feature

2026-09-10 08:36:42 +02:00
parent bb012702fe
commit 008adbfdb6
19 changed files with 582 additions and 2756 deletions
--- a/design_handoff_helder_inline_diff/03b-in-pane-diff.html
+++ b/design_handoff_helder_inline_diff/03b-in-pane-diff.html
@@ -0,0 +1,281 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="utf-8">
+<title>Helder — 3b · in-pane diff (design reference)</title>
+<link rel="preconnect" href="https://fonts.googleapis.com">
+<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+<link href="https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600;700&family=IBM+Plex+Sans:wght@400;500;600&display=swap" rel="stylesheet">
+<style>
+  body { margin: 0; background: #EFF0EE; padding: 40px; font-family: 'IBM Plex Sans', sans-serif; color: #171C22; }
+  @keyframes blink { 0%, 49% { opacity: 1; } 50%, 100% { opacity: 0; } }
+</style>
+</head>
+<body>
+<div data-screen-label="03b Diff in pane" style="width:1760px;height:1000px;background:#101720;border:1px solid #CDD1CD;border-radius:4px;overflow:hidden;display:flex;flex-direction:column;color:#E4E7E6">
+
+      <div style="height:44px;flex:none;background:#18202B;border-bottom:1px solid #232C39;display:flex;align-items:center;gap:18px;padding:0 14px">
+        <div style="display:flex;gap:8px;flex:none">
+          <span style="width:12px;height:12px;border-radius:9999px;background:#E8913A"></span>
+          <span style="width:12px;height:12px;border-radius:9999px;background:#6C7783"></span>
+          <span style="width:12px;height:12px;border-radius:9999px;background:#3A424C"></span>
+        </div>
+        <div style="display:flex;align-items:baseline;gap:10px;flex:none">
+          <span style="font:700 13px/1 'IBM Plex Mono',monospace;letter-spacing:.02em;color:#F4F5F4">helder<span style="color:#E8913A;animation:blink 1.1s steps(1,end) infinite">.</span></span>
+          <span style="font:400 12px/1 'IBM Plex Mono',monospace;color:#6C7783">bob</span>
+          <span style="font:400 12px/1 'IBM Plex Mono',monospace;color:#6C7783">·</span>
+          <span style="font:500 12px/1 'IBM Plex Mono',monospace;color:#E8913A">bob2</span>
+        </div>
+        <div style="display:flex;align-items:center;gap:7px;font:400 12px/1 'IBM Plex Mono',monospace;color:#6C7783;flex:1;min-width:0">
+          <span>agents</span><span>›</span><span>mail-checker</span><span>›</span>
+          <span style="color:#F4F5F4;font-weight:600">README.md</span>
+        </div>
+        <div style="display:flex;align-items:center;gap:4px;flex:none">
+          <span style="display:flex;align-items:center;gap:8px;padding:6px 9px;border-radius:2px;font:400 12px/1 'IBM Plex Sans',sans-serif;color:#BAC0C0">Search <span style="font:600 12px/1 'IBM Plex Mono',monospace;color:#E8913A;border:1px solid #232C39;border-radius:2px;padding:4px 6px">⌘F</span></span>
+          <span style="display:flex;align-items:center;gap:8px;padding:6px 9px;border-radius:2px;font:400 12px/1 'IBM Plex Sans',sans-serif;color:#BAC0C0">Fluid <span style="font:600 12px/1 'IBM Plex Mono',monospace;color:#E8913A;border:1px solid #232C39;border-radius:2px;padding:4px 6px">⌘L</span></span>
+          <span style="display:flex;align-items:center;gap:8px;padding:6px 9px;border-radius:2px;font:400 12px/1 'IBM Plex Sans',sans-serif;color:#6C7783">Hidden <span style="font:600 12px/1 'IBM Plex Mono',monospace;color:#6C7783;border:1px solid #232C39;border-radius:2px;padding:4px 6px">⌘.</span></span>
+          <span style="display:flex;align-items:center;gap:8px;padding:6px 9px;border-radius:2px;font:400 12px/1 'IBM Plex Sans',sans-serif;color:#BAC0C0">Note <span style="font:600 12px/1 'IBM Plex Mono',monospace;color:#E8913A;border:1px solid #232C39;border-radius:2px;padding:4px 6px">⌘N</span></span>
+          <span style="display:flex;align-items:center;gap:8px;padding:6px 9px;border-radius:2px;background:rgba(232,145,58,.10);font:500 12px/1 'IBM Plex Sans',sans-serif;color:#F4F5F4">Git <span style="font:600 12px/1 'IBM Plex Mono',monospace;color:#E8913A;border:1px solid rgba(232,145,58,.35);border-radius:2px;padding:4px 6px">⌘G</span></span>
+          <span style="width:26px;height:26px;margin-left:6px;border:1px solid #232C39;border-radius:2px;display:flex;align-items:center;justify-content:center;font:600 12px/1 'IBM Plex Mono',monospace;color:#6C7783">?</span>
+        </div>
+      </div>
+
+      <div style="flex:1;min-height:0;display:flex;position:relative">
+
+        <!-- source control -->
+        <div style="width:300px;flex:none;background:#18202B;border-right:1px solid #232C39;display:flex;flex-direction:column">
+          <div style="height:46px;flex:none;box-sizing:border-box;padding:0 12px;display:flex;gap:8px;align-items:center;border-bottom:1px solid #232C39">
+            <div style="flex:1;min-width:0;height:30px;background:#101720;border:1px solid #232C39;border-radius:2px;padding:0 9px;display:flex;align-items:center;font:400 12px/1 'IBM Plex Sans',sans-serif;color:#E4E7E6">runs mail check once an hour</div>
+            <div style="width:30px;height:30px;flex:none;border:1px solid #232C39;border-radius:2px;display:flex;align-items:center;justify-content:center;font:400 15px/1 'IBM Plex Mono',monospace;color:#BAC0C0">↑</div>
+          </div>
+          <div style="padding:14px 12px 6px;font:700 10px/1 'IBM Plex Mono',monospace;letter-spacing:.14em;text-transform:uppercase;color:#6C7783;display:flex;justify-content:space-between">
+            <span>staged changes</span><span style="color:#E8913A">3</span>
+          </div>
+          <div style="display:flex;flex-direction:column">
+            <div style="height:22px;display:flex;align-items:center;gap:7px;padding:0 12px;font:400 11px/1 'IBM Plex Mono',monospace;color:#6C7783;overflow:hidden"><span style="flex:none">▤</span><span style="overflow:hidden;text-overflow:ellipsis;white-space:nowrap">agents/mail-checker</span></div>
+            <div style="height:26px;display:flex;align-items:center;gap:8px;padding:0 12px 0 10px;background:#232C39;border-left:2px solid #E8913A"><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#8FBFB4;width:12px">M</span><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#101720;background:#BAC0C0;border-radius:2px;padding:4px 5px">md</span><span style="font:500 12px/1 'IBM Plex Sans',sans-serif;color:#F4F5F4;overflow:hidden;text-overflow:ellipsis;white-space:nowrap">README.md</span></div>
+            <div style="height:22px;display:flex;align-items:center;gap:7px;padding:0 12px;font:400 11px/1 'IBM Plex Mono',monospace;color:#6C7783;overflow:hidden"><span style="flex:none">▤</span><span style="overflow:hidden;text-overflow:ellipsis;white-space:nowrap">scheduler</span></div>
+            <div style="height:26px;display:flex;align-items:center;gap:8px;padding:0 12px 0 12px;border-left:2px solid transparent"><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#8FBFB4;width:12px">M</span><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#101720;background:#F8C793;border-radius:2px;padding:4px 5px">yml</span><span style="font:400 12px/1 'IBM Plex Sans',sans-serif;color:#BAC0C0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap">scheduler.yaml</span></div>
+            <div style="height:22px;display:flex;align-items:center;gap:7px;padding:0 12px;font:400 11px/1 'IBM Plex Mono',monospace;color:#6C7783;overflow:hidden"><span style="flex:none">▤</span><span style="overflow:hidden;text-overflow:ellipsis;white-space:nowrap">state</span></div>
+            <div style="height:26px;display:flex;align-items:center;gap:8px;padding:0 12px 0 12px;border-left:2px solid transparent"><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#8FBFB4;width:12px">M</span><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#101720;background:#A8D6CB;border-radius:2px;padding:4px 5px">tsv</span><span style="font:400 12px/1 'IBM Plex Sans',sans-serif;color:#BAC0C0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap">skill-usage.tsv</span></div>
+          </div>
+          <div style="margin:16px 12px 0;border-top:1px solid #232C39"></div>
+          <div style="padding:14px 12px 6px;font:700 10px/1 'IBM Plex Mono',monospace;letter-spacing:.14em;text-transform:uppercase;color:#6C7783;display:flex;justify-content:space-between">
+            <span>changes</span><span style="color:#E8913A">3</span>
+          </div>
+          <div style="display:flex;flex-direction:column">
+            <div style="height:22px;display:flex;align-items:center;gap:7px;padding:0 12px;font:400 11px/1 'IBM Plex Mono',monospace;color:#6C7783;overflow:hidden"><span style="flex:none">▤</span><span style="overflow:hidden;text-overflow:ellipsis;white-space:nowrap">.</span></div>
+            <div style="height:26px;display:flex;align-items:center;gap:8px;padding:0 12px 0 12px;border-left:2px solid transparent"><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#F0B476;width:12px">M</span><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#101720;background:#BAC0C0;border-radius:2px;padding:4px 5px">md</span><span style="font:400 12px/1 'IBM Plex Sans',sans-serif;color:#BAC0C0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap">CLAUDE.md</span></div>
+            <div style="height:22px;display:flex;align-items:center;gap:7px;padding:0 12px;font:400 11px/1 'IBM Plex Mono',monospace;color:#6C7783;overflow:hidden"><span style="flex:none">▤</span><span style="overflow:hidden;text-overflow:ellipsis;white-space:nowrap">scripts</span></div>
+            <div style="height:26px;display:flex;align-items:center;gap:8px;padding:0 12px 0 12px;border-left:2px solid transparent"><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#F0B476;width:12px">M</span><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#101720;background:#BAC0C0;border-radius:2px;padding:4px 5px">md</span><span style="font:400 12px/1 'IBM Plex Sans',sans-serif;color:#BAC0C0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap">README.md</span></div>
+            <div style="height:26px;display:flex;align-items:center;gap:8px;padding:0 12px 0 12px;border-left:2px solid transparent"><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#F0B476;width:12px">M</span><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#101720;background:#EFBCB0;border-radius:2px;padding:4px 5px">sh</span><span style="font:400 12px/1 'IBM Plex Sans',sans-serif;color:#BAC0C0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap">check-docs-rot.sh</span></div>
+          </div>
+          <div style="flex:1"></div>
+          <div style="padding:12px;border-top:1px solid #232C39;font:400 11px/1.5 'IBM Plex Mono',monospace;color:#6C7783">3 staged · 3 unstaged</div>
+        </div>
+
+        <!-- explorer -->
+        <div style="width:288px;flex:none;background:#18202B;border-right:1px solid #232C39;display:flex;flex-direction:column;overflow:hidden">
+          <div style="height:46px;flex:none;display:flex;align-items:center;justify-content:space-between;padding:0 12px;border-bottom:1px solid #232C39;font:700 10px/1 'IBM Plex Mono',monospace;letter-spacing:.14em;text-transform:uppercase;color:#6C7783"><span>explorer</span><span>bob</span></div>
+          <div style="flex:1;min-height:0;padding:6px 0;display:flex;flex-direction:column;font:400 13px/1 'IBM Plex Sans',sans-serif;overflow:hidden">
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 12px;color:#F4F5F4"><span style="color:#E8913A;width:8px">⌄</span><span style="color:#828D9A">▤</span>agents</div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 28px;color:#BAC0C0"><span style="color:#6C7783;width:8px">›</span><span style="color:#828D9A">▤</span>knowledge-researcher</div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 28px;color:#BAC0C0"><span style="color:#6C7783;width:8px">›</span><span style="color:#828D9A">▤</span>lead-agent</div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 28px;color:#F4F5F4"><span style="color:#E8913A;width:8px">⌄</span><span style="color:#828D9A">▤</span>mail-checker</div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 60px;color:#BAC0C0"><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#101720;background:#BAC0C0;border-radius:2px;padding:4px 5px">md</span><span>PROMPT.md</span><span style="flex:1"></span></div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 58px;color:#F4F5F4;background:#232C39;border-left:2px solid #E8913A"><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#101720;background:#BAC0C0;border-radius:2px;padding:4px 5px">md</span><span style="font-weight:500">README.md</span><span style="flex:1"></span><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#8FBFB4">M</span></div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 60px;color:#BAC0C0"><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#101720;background:#BAC0C0;border-radius:2px;padding:4px 5px">md</span><span>STATE.md</span><span style="flex:1"></span></div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 28px;color:#BAC0C0"><span style="color:#6C7783;width:8px">›</span><span style="color:#828D9A">▤</span>ok-monitor</div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 28px;color:#BAC0C0"><span style="color:#6C7783;width:8px">›</span><span style="color:#828D9A">▤</span>sterrenkijker</div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 28px;color:#BAC0C0"><span style="color:#6C7783;width:8px">›</span><span style="color:#828D9A">▤</span>tony</div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 44px;color:#BAC0C0"><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#101720;background:#BAC0C0;border-radius:2px;padding:4px 5px">md</span><span>README.md</span><span style="flex:1"></span></div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 12px;color:#BAC0C0"><span style="color:#6C7783;width:8px">›</span><span style="color:#828D9A">▤</span>assets</div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 12px;color:#BAC0C0"><span style="color:#6C7783;width:8px">›</span><span style="color:#828D9A">▤</span>data</div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 12px;color:#BAC0C0"><span style="color:#6C7783;width:8px">›</span><span style="color:#828D9A">▤</span>docker</div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 12px;color:#BAC0C0"><span style="color:#6C7783;width:8px">›</span><span style="color:#828D9A">▤</span>logs</div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 12px;color:#F4F5F4"><span style="color:#E8913A;width:8px">⌄</span><span style="color:#828D9A">▤</span>scheduler</div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 28px;color:#BAC0C0"><span style="color:#6C7783;width:8px">›</span><span style="color:#828D9A">▤</span>prompts</div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 44px;color:#BAC0C0"><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#101720;background:#BAC0C0;border-radius:2px;padding:4px 5px">md</span><span>README.md</span><span style="flex:1"></span></div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 44px;color:#BAC0C0"><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#101720;background:#BAC0C0;border-radius:2px;padding:4px 5px">md</span><span>runs-2026H2.md</span><span style="flex:1"></span></div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 44px;color:#BAC0C0"><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#101720;background:#BAC0C0;border-radius:2px;padding:4px 5px">md</span><span>runs.md</span><span style="flex:1"></span></div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 44px;color:#BAC0C0"><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#101720;background:#F8C793;border-radius:2px;padding:4px 5px">yml</span><span>scheduler.yaml</span><span style="flex:1"></span><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#8FBFB4">M</span></div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 44px;color:#BAC0C0"><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#101720;background:#EFBCB0;border-radius:2px;padding:4px 5px">sh</span><span>test.sh</span><span style="flex:1"></span></div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 44px;color:#BAC0C0"><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#101720;background:#EFBCB0;border-radius:2px;padding:4px 5px">sh</span><span>tick.sh</span><span style="flex:1"></span></div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 12px;color:#BAC0C0"><span style="color:#6C7783;width:8px">›</span><span style="color:#828D9A">▤</span>scripts</div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 12px;color:#F4F5F4"><span style="color:#E8913A;width:8px">⌄</span><span style="color:#828D9A">▤</span>state</div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 44px;color:#BAC0C0"><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#101720;background:#C3A6CE;border-radius:2px;padding:4px 5px">json</span><span>mail-state.json</span><span style="flex:1"></span></div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 44px;color:#BAC0C0"><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#101720;background:#C3A6CE;border-radius:2px;padding:4px 5px">json</span><span>read-counts.json</span><span style="flex:1"></span></div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 44px;color:#BAC0C0"><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#101720;background:#BAC0C0;border-radius:2px;padding:4px 5px">md</span><span>README.md</span><span style="flex:1"></span></div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 44px;color:#BAC0C0"><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#101720;background:#A8D6CB;border-radius:2px;padding:4px 5px">tsv</span><span>skill-usage.tsv</span><span style="flex:1"></span><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#8FBFB4">M</span></div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 28px;color:#BAC0C0"><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#101720;background:#BAC0C0;border-radius:2px;padding:4px 5px">md</span><span>CLAUDE.md</span><span style="flex:1"></span><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#8FBFB4">M</span></div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 28px;color:#BAC0C0"><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#101720;background:#BAC0C0;border-radius:2px;padding:4px 5px">md</span><span>GUARDRAILS.md</span><span style="flex:1"></span></div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 28px;color:#BAC0C0"><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#101720;background:#BAC0C0;border-radius:2px;padding:4px 5px">md</span><span>LOOP.md</span><span style="flex:1"></span></div>
+            <div style="height:24px;display:flex;align-items:center;gap:7px;padding:0 12px 0 28px;color:#BAC0C0"><span style="font:600 10px/1 'IBM Plex Mono',monospace;color:#101720;background:#BAC0C0;border-radius:2px;padding:4px 5px">md</span><span>MEMORY.md</span><span style="flex:1"></span></div>
+          </div>
+        </div>
+
+        <!-- editor · diff -->
+        <div style="flex:1;min-width:0;background:#101720;display:flex;flex-direction:column;overflow:hidden">
+          <div style="height:46px;flex:none;display:flex;align-items:center;border-bottom:1px solid #232C39">
+            <span style="width:46px;flex:none;text-align:center;font:700 10px/1 'IBM Plex Mono',monospace;letter-spacing:.14em;text-transform:uppercase;color:#6C7783">bob</span>
+            <div style="flex:1;min-width:0;display:flex;align-items:center;gap:12px;padding:0 12px">
+              <span style="font:700 10px/1 'IBM Plex Mono',monospace;letter-spacing:.14em;text-transform:uppercase;color:#6C7783">modified</span>
+              <span style="font:500 12px/1 'IBM Plex Mono',monospace;color:#8FBFB4">+2</span>
+              <span style="font:500 12px/1 'IBM Plex Mono',monospace;color:#C4741F">−2</span>
+              <span style="flex:1"></span>
+              <div style="display:flex;border:1px solid #232C39;border-radius:2px;overflow:hidden">
+                <span style="padding:5px 12px;font:500 11px/1 'IBM Plex Sans',sans-serif;color:#171C22;background:#E8913A">Actual</span>
+                <span style="padding:5px 12px;font:400 11px/1 'IBM Plex Sans',sans-serif;color:#BAC0C0;border-left:1px solid #232C39">Original</span>
+                <span style="padding:5px 12px;font:400 11px/1 'IBM Plex Sans',sans-serif;color:#BAC0C0;border-left:1px solid #232C39">Preview</span>
+                <span style="padding:5px 12px;font:400 11px/1 'IBM Plex Sans',sans-serif;color:#BAC0C0;border-left:1px solid #232C39">Diff</span>
+              </div>
+            </div>
+          </div>
+          <div style="flex:1;min-height:0;display:flex;overflow:hidden">
+            <div style="width:46px;flex:none;border-right:1px solid #232C39;display:flex;flex-direction:column;padding-top:8px;font:600 10px/1 'IBM Plex Mono',monospace;color:#8FBFB4">
+              <span style="height:110px"></span>
+              <span style="height:20px;display:flex;align-items:center;justify-content:center;background:#232C39">M</span>
+              <span style="height:340px"></span>
+              <span style="height:20px;display:flex;align-items:center;justify-content:center;color:#C4741F">M</span>
+            </div>
+            <div style="flex:1;min-width:0;display:grid;grid-template-columns:44px 1fr;align-content:start;font:400 13px/20px 'IBM Plex Mono',monospace;padding:8px 0">
+          <span style="text-align:right;padding-right:12px;color:#5A6472">1</span><span style="padding-right:18px;color:#F4F5F4;text-wrap:pretty"># mail-checker — how I dispatch it</span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">2</span><span></span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">3</span><span style="padding-right:18px;color:#BAC0C0;text-wrap:pretty">This file is for me (Bob), the dispatcher. It says when to run this agent and how. The agent's own prompt is <span style="color:#A8D6CB">[`PROMPT.md`](PROMPT.md)</span>. I do not read that file myself.</span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">6</span><span></span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">7</span><span style="padding-right:18px;color:#F4F5F4;text-wrap:pretty">## What it does</span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">8</span><span></span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">9</span><span style="padding-right:18px;color:#BAC0C0;text-wrap:pretty">It works through imported mails that no AI has looked at yet. Per mail it does three things:</span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">11</span><span></span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">12</span><span style="padding-right:18px;color:#BAC0C0;text-wrap:pretty">1. Judges whether Jonathan should actually read it.</span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">13</span><span style="padding-right:18px;color:#BAC0C0;text-wrap:pretty">2. Cleans the body into readable Markdown.</span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">14</span><span style="padding-right:18px;color:#BAC0C0;text-wrap:pretty">3. Makes a todo when the mail asks for a concrete action.</span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">15</span><span></span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">16</span><span style="padding-right:18px;color:#BAC0C0;text-wrap:pretty">New people it meets get a Vault note, so Blijnder remembers them.</span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">17</span><span></span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">18</span><span style="padding-right:18px;color:#F4F5F4;text-wrap:pretty">## The hard boundary</span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">19</span><span></span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">20</span><span style="padding-right:18px;color:#BAC0C0;text-wrap:pretty">It reads, cleans, classifies and records. It never replies to a mail, never deletes a mail, and never chooses a recipient. Nothing that it touches leaves Blijnder, and there is no exception to that.</span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">23</span><span></span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">24</span><span style="padding-right:18px;color:#BAC0C0;text-wrap:pretty">Between 2026-08-22 and 2026-08-27 there was one: an invoice went to the administration through a script of its own. Skynet does that job now (skynet#41), thus the workspace gave it up (bob#371). The agent is mute again, and the outbound gate refuses every command that would speak for it.</span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">28</span><span></span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">29</span><span style="padding-right:18px;color:#F4F5F4;text-wrap:pretty">## When to dispatch</span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">30</span><span></span>
+          <span style="text-align:right;padding-right:12px;color:#8FBFB4;background:rgba(143,191,180,.12);border-left:2px solid #8FBFB4">31</span><span id="changed-line" style="padding-right:18px;color:#F4F5F4;background:rgba(143,191,180,.12);text-wrap:pretty">- The scheduler fires it. Job <span style="color:#F0B476">`mail-checker-ronde`</span>, every hour, on the hour.</span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">32</span><span style="padding-right:18px;color:#BAC0C0;text-wrap:pretty">- Jonathan asks for a mail sweep.</span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">33</span><span style="padding-right:18px;color:#BAC0C0;text-wrap:pretty">- The mail step of my tick shows unchecked mail piling up.</span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">34</span><span></span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">35</span><span style="padding-right:18px;color:#F4F5F4;text-wrap:pretty">## How to dispatch</span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">36</span><span></span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">37</span><span style="padding-right:18px;color:#BAC0C0;text-wrap:pretty">Send a subagent the <span style="color:#F4F5F4;font-weight:600">path</span>, not the content:</span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">38</span><span></span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">39</span><span style="padding-right:18px;color:#6C7783;text-wrap:pretty">```</span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">40</span><span style="padding-right:18px;color:#BAC0C0;text-wrap:pretty">Agent tool → "Read agents/mail-checker/PROMPT.md and follow it."</span>
+          <span style="text-align:right;padding-right:12px;color:#5A6472">41</span><span style="padding-right:18px;color:#6C7783;text-wrap:pretty">```</span>
+            </div>
+            <div style="width:16px;flex:none;border-left:1px solid #232C39;display:flex;flex-direction:column;align-items:center;padding-top:8px">
+              <span style="height:104px"></span>
+              <span style="width:4px;height:4px;background:#6C7783"></span>
+              <span style="height:64px"></span>
+              <span style="width:4px;height:4px;background:#8FBFB4"></span>
+              <span style="height:184px"></span>
+              <span style="width:4px;height:4px;background:#6C7783"></span>
+              <span style="height:118px"></span>
+              <span style="width:4px;height:4px;background:#C4741F"></span>
+            </div>
+          </div>
+        </div>
+
+        <!-- agent -->
+        <div style="width:480px;flex:none;background:#101720;border-left:1px solid #232C39;display:flex;flex-direction:column;overflow:hidden">
+          <div style="flex:1;min-height:0;padding:14px 16px;display:flex;flex-direction:column;gap:12px;overflow:hidden;font:400 13px/1.6 'IBM Plex Sans',sans-serif;color:#BAC0C0">
+            <div style="font:400 12px/1.6 'IBM Plex Mono',monospace;color:#6C7783;text-wrap:pretty">98:| <span style="color:#F0B476">[`check-docs-rot.sh`](check-docs-rot.sh)</span> | It checks my rule files for references that are not correct any more: a script or a flag that does not exist, a dead markdown link, an orphan script, an</div>
+            <div style="font:400 12px/1.6 'IBM Plex Mono',monospace;color:#6C7783">└ Allowed by auto mode classifier</div>
+            <div style="display:flex;gap:10px"><span style="color:#6C7783">●</span><span style="text-wrap:pretty">The column is gone. <span style="color:#F0B476;font-family:'IBM Plex Mono',monospace">CLAUDE.md</span> now names which agents exist, and nothing about their clock.</span></div>
+            <div style="text-wrap:pretty"><span style="font-weight:600;color:#F4F5F4">Why it was there.</span> The table was written as one map with three columns, and <span style="color:#F0B476;font-family:'IBM Plex Mono',monospace">check-docs-rot.sh</span> section L then enforced the third against the cron lines. That made the coupling real: each change of a schedule broke the check until somebody opened a pull request on the root.</div>
+            <div style="text-wrap:pretty"><span style="font-weight:600;color:#F4F5F4">What changed.</span> The table is two columns. Below it stands one rule: when a job runs, and whether it runs at all, stands in <span style="color:#F0B476;font-family:'IBM Plex Mono',monospace">scheduler/scheduler.yaml</span> and only there. Section L still holds the table against <span style="color:#F0B476;font-family:'IBM Plex Mono',monospace">agents/</span> in both directions, and it no longer reads a clock.</div>
+            <div style="text-wrap:pretty"><span style="font-weight:600;color:#F4F5F4">The check is cleaner now.</span> It reported <span style="color:#F0B476;font-family:'IBM Plex Mono',monospace">knowledge-researcher</span> and <span style="color:#F0B476;font-family:'IBM Plex Mono',monospace">sterrenkijker</span> as wrong; both were this same duplication, and both are gone.</div>
+            <div style="text-wrap:pretty">Five files stand changed and uncommitted. <span style="color:#F0B476;font-family:'IBM Plex Mono',monospace">CLAUDE.md</span> is a root file, so it needs a pull request when you commit it.</div>
+            <div style="font:400 12px/1.6 'IBM Plex Mono',monospace;color:#6C7783">✳ Churned for 2m 49s · done 8:10 AM</div>
+          </div>
+          <div style="margin:0 16px 12px;height:44px;flex:none;background:#101720;border:2px solid #E8913A;box-shadow:0 0 0 2px rgba(232,145,58,.22);border-radius:2px;display:flex;align-items:center;gap:8px;padding:0 12px">
+            <span style="font:400 13px/1 'IBM Plex Mono',monospace;color:#E8913A">›</span>
+            <span style="width:1px;height:16px;background:#E8913A;animation:blink 1.1s steps(1,end) infinite"></span>
+    
+        <!-- hover: original of the whole file, same scroll -->
+        <!-- id added for the demo script -->
+        <div id="original-overlay" style="display:none;position:absolute;z-index:20;top:0;right:0;bottom:0;width:496px;background:#101720;border-left:2px solid #C4741F;box-shadow:0 4px 16px rgba(23,28,34,.10);flex-direction:column;overflow:hidden">
+          <div style="height:46px;flex:none;display:flex;align-items:center;gap:12px;padding:0 14px;border-bottom:1px solid #232C39;background:#18202B">
+            <span style="font:700 10px/1 'IBM Plex Mono',monospace;letter-spacing:.14em;text-transform:uppercase;color:#C4741F">original</span>
+            <span style="font:400 11px/1 'IBM Plex Mono',monospace;color:#6C7783">before this change · same scroll</span>
+            <span style="flex:1"></span>
+            <span style="font:400 11px/1 'IBM Plex Mono',monospace;color:#6C7783">hold hover</span>
+          </div>
+          <div style="flex:1;min-height:0;display:grid;grid-template-columns:35px 1fr;align-content:start;font:400 10.3px/20px 'IBM Plex Mono',monospace;padding:8px 0;overflow:hidden">
+              <span style="text-align:right;padding-right:9px;color:#5A6472">1</span><span style="padding-right:11px;color:#F4F5F4;text-wrap:pretty"># mail-checker — how I dispatch it</span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">2</span><span></span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">3</span><span style="padding-right:11px;color:#BAC0C0;text-wrap:pretty">This file is for me (Bob), the dispatcher. It says when to run this agent and how. The agent's own prompt is <span style="color:#A8D6CB">[`PROMPT.md`](PROMPT.md)</span>. I do not read that file myself.</span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">6</span><span></span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">7</span><span style="padding-right:11px;color:#F4F5F4;text-wrap:pretty">## What it does</span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">8</span><span></span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">9</span><span style="padding-right:11px;color:#BAC0C0;text-wrap:pretty">It works through imported mails that no AI has looked at yet. Per mail it does three things:</span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">11</span><span></span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">12</span><span style="padding-right:11px;color:#BAC0C0;text-wrap:pretty">1. Judges whether Jonathan should actually read it.</span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">13</span><span style="padding-right:11px;color:#BAC0C0;text-wrap:pretty">2. Cleans the body into readable Markdown.</span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">14</span><span style="padding-right:11px;color:#BAC0C0;text-wrap:pretty">3. Makes a todo when the mail asks for a concrete action.</span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">15</span><span></span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">16</span><span style="padding-right:11px;color:#BAC0C0;text-wrap:pretty">New people it meets get a Vault note, so Blijnder remembers them.</span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">17</span><span></span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">18</span><span style="padding-right:11px;color:#F4F5F4;text-wrap:pretty">## The hard boundary</span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">19</span><span></span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">20</span><span style="padding-right:11px;color:#BAC0C0;text-wrap:pretty">It reads, cleans, classifies and records. It never replies to a mail, never deletes a mail, and never chooses a recipient. Nothing that it touches leaves Blijnder, and there is no exception to that.</span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">23</span><span></span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">24</span><span style="padding-right:11px;color:#BAC0C0;text-wrap:pretty">Between 2026-08-22 and 2026-08-27 there was one: an invoice went to the administration through a script of its own. Skynet does that job now (skynet#41), thus the workspace gave it up (bob#371). The agent is mute again, and the outbound gate refuses every command that would speak for it.</span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">28</span><span></span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">29</span><span style="padding-right:11px;color:#F4F5F4;text-wrap:pretty">## When to dispatch</span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">30</span><span></span>
+              <span style="text-align:right;padding-right:9px;color:#C4741F;background:rgba(196,116,31,.14);border-left:2px solid #C4741F">31</span><span style="padding-right:11px;color:#E4E7E6;background:rgba(196,116,31,.14);text-wrap:pretty">- The scheduler fires it. Job <span style="color:#F0B476">`mail-checker-ronde`</span>, every 15 minutes.</span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">32</span><span style="padding-right:11px;color:#BAC0C0;text-wrap:pretty">- Jonathan asks for a mail sweep.</span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">33</span><span style="padding-right:11px;color:#BAC0C0;text-wrap:pretty">- The mail step of my tick shows unchecked mail piling up.</span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">34</span><span></span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">35</span><span style="padding-right:11px;color:#F4F5F4;text-wrap:pretty">## How to dispatch</span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">36</span><span></span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">37</span><span style="padding-right:11px;color:#BAC0C0;text-wrap:pretty">Send a subagent the <span style="color:#F4F5F4;font-weight:600">path</span>, not the content:</span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">38</span><span></span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">39</span><span style="padding-right:11px;color:#6C7783;text-wrap:pretty">```</span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">40</span><span style="padding-right:11px;color:#BAC0C0;text-wrap:pretty">Agent tool → "Read agents/mail-checker/PROMPT.md and follow it."</span>
+              <span style="text-align:right;padding-right:9px;color:#5A6472">41</span><span style="padding-right:11px;color:#6C7783;text-wrap:pretty">```</span>
+          </div>
+        </div>
+      </div>
+          <div style="padding:0 16px 12px;display:flex;flex-direction:column;gap:6px;font:400 11px/1.5 'IBM Plex Mono',monospace;color:#6C7783">
+            <div style="display:flex;align-items:center;gap:8px">
+              <span>[Opus 5 · 1M]</span>
+              <span style="color:#171C22;background:#E8913A;border-radius:2px;padding:3px 6px;font-weight:600">bob</span>
+              <span>|</span><span style="color:#A8D6CB">⑂ bob2</span>
+              <span style="flex:1"></span><span>/rc</span>
+            </div>
+            <div><span style="color:#E8913A">▸▸ auto mode on</span> (shift+tab to cycle) · ← for agents</div>
+          </div>
+          <div style="height:150px;flex:none;background:#101720;border-top:1px solid #232C39;padding:12px 16px;font:400 12px/1.7 'IBM Plex Mono',monospace;color:#BAC0C0">
+            <div><span style="color:#A8D6CB">[bob2]</span><span style="color:#828D9A">[~/code/bob]$</span> <span style="display:inline-block;width:7px;height:14px;background:#E8913A;vertical-align:-2px;animation:blink 1.1s steps(1,end) infinite"></span></div>
+          </div>
+        </div>
+      </div>
+
+      <div style="height:28px;flex:none;background:#18202B;border-top:1px solid #232C39;display:flex;align-items:center;gap:16px;padding:0 14px;font:400 11px/1 'IBM Plex Mono',monospace;color:#6C7783">
+        <span style="color:#E8913A">⑂ bob2</span>
+        <span style="color:#A8D6CB">+22</span><span style="color:#C4741F">−66</span>
+        <span style="flex:1"></span>
+        <span>agents/mail-checker/README.md</span>
+        <span>·</span><span>Ln 1, Col 1</span><span>·</span><span>UTF-8</span><span>·</span><span>LF</span><span>·</span><span style="color:#D4D9D8">Markdown</span>
+      </div>
+    </div>
+<script>
+  var row = document.getElementById('changed-line');
+  var overlay = document.getElementById('original-overlay');
+  row.addEventListener('mouseenter', function () { overlay.style.display = 'flex'; });
+  row.addEventListener('mouseleave', function () { overlay.style.display = 'none'; });
+</script>
+</body>
+</html>
--- a/design_handoff_helder_inline_diff/README.md
+++ b/design_handoff_helder_inline_diff/README.md
@@ -0,0 +1,245 @@
+# Handoff: Helder — in-pane diff (screen 3b)
+
+## Overview
+
+Helder is a desktop editor for working with Claude Code. This handoff covers **one screen**: the
+workspace with a modified file open in the editor pane, in **Actual** view.
+
+The idea behind the screen: the user always reads the **current** version of the file. A changed
+line is marked in place with a teal rule and a teal tint — nothing else moves, no split view, no
+`+`/`−` line pairs. When the user hovers a changed line, the **whole original file** slides in over
+the right-hand column (agent + terminal) at the **same scroll position**, so the two versions can be
+compared line by line. The overlay disappears on mouse-out. There is no mode to enter and no mode to
+leave.
+
+## About the design files
+
+`03b-in-pane-diff.html` in this folder is a **design reference created in HTML** — a prototype that
+shows the intended look and behaviour. It is not production code to copy.
+
+The task is to **recreate this design in the target codebase's own environment** (Electron + React,
+Tauri, SwiftUI, whatever Helder already uses) with that codebase's established patterns, components
+and styling layer. If no environment exists yet, choose the framework that fits the product and
+implement the design there.
+
+The HTML uses inline styles throughout because of how the design tool works. Do not treat that as a
+styling instruction — move the values into the codebase's own token/theme layer.
+
+## Fidelity
+
+**High fidelity.** Colours, type, spacing, row heights and states below are final and exact.
+Recreate the UI pixel-perfectly. The only intentionally loose part is the file-tree and
+source-control content, which is sample data.
+
+## Screen
+
+**Name:** Workspace — file modified, Actual view
+**Canvas:** 1760 × 1000 px (design size; the real window is resizable — see *Responsive behaviour*)
+**Purpose:** read and edit a file that has uncommitted changes, while Claude Code works in the right
+column; check what any changed line used to be without leaving the file.
+
+### Column layout (left → right)
+
+| Region | Width | Background | Divider |
+|---|---|---|---|
+| Source control | 300 px, fixed | `#18202B` | 1 px `#232C39` right |
+| Explorer | 288 px, fixed | `#18202B` | 1 px `#232C39` right |
+| Editor | flexible (692 px at 1760) | `#101720` | — |
+| Agent + terminal | 480 px, fixed | `#101720` | 1 px `#232C39` left |
+
+Vertical stack: title bar 44 px → body row (flex: 1) → status bar 28 px.
+
+### Title bar — 44 px, `#18202B`, 1 px `#232C39` bottom
+
+- Traffic lights: three 12 px circles, `#E8913A` / `#6C7783` / `#3A424C`, 8 px gap, 14 px from left.
+- Wordmark `helder.` — IBM Plex Mono 700 13 px `#F4F5F4`; **the period is `#E8913A` and blinks**
+  (see *Animation*).
+- Repo · worktree: `bob` `#6C7783` · `bob2` `#E8913A` 500, Plex Mono 12 px.
+- Breadcrumb: Plex Mono 12 px `#6C7783`, `›` separators, last crumb `#F4F5F4` 600.
+- Right cluster, each 6 px 9 px padding, Plex Sans 12 px label + Plex Mono 12 px 600 shortcut chip
+  (1 px `#232C39`, radius 2, padding 4 px 6 px): Search ⌘F · Fluid ⌘L · Hidden ⌘. (label and chip
+  `#6C7783` — the off state) · Note ⌘N · **Git ⌘G active**: background `rgba(232,145,58,.10)`, label
+  `#F4F5F4`, chip border `rgba(232,145,58,.35)`. Then a 26 × 26 `?` button, 1 px `#232C39`.
+
+### The 46 px header row
+
+All three panel headers sit on **one 46 px row** with their 1 px `#232C39` bottom borders on the
+same line. This alignment is deliberate — do not let any one of them grow.
+
+1. **Source control commit row** — 46 px, padding 0 12 px, flex, 8 px gap, centred.
+   Commit field: flex 1, height 30 px, `#101720`, 1 px `#232C39`, radius 2, padding 0 9 px,
+   Plex Sans 12 px `#E4E7E6`. Sample value: `runs mail check once an hour`.
+   Push button: 30 × 30, 1 px `#232C39`, radius 2, glyph `↑` Plex Mono 15 px `#BAC0C0`.
+2. **Explorer header** — 46 px, padding 0 12 px, space-between, Plex Mono 700 10 px, tracking
+   `.14em`, uppercase, `#6C7783`: `EXPLORER` … `BOB`.
+3. **Editor header** — 46 px. A 46 px-wide agent-rail cell first (centred `BOB`, same label style),
+   then: `MODIFIED` (Plex Mono 700 10 px uppercase `#6C7783`), `+2` `#8FBFB4`, `−2` `#C4741F` (both
+   Plex Mono 500 12 px), spacer, then the view switch.
+
+**View switch** — a single bordered group, 1 px `#232C39`, radius 2, `overflow: hidden`, each item
+5 px 12 px, Plex Sans 11 px, dividers 1 px `#232C39` between items:
+`Actual` (**active**: `#E8913A` fill, `#171C22` text, weight 500) · `Original` · `Preview` · `Diff`
+(inactive: `#BAC0C0`). Actual is the default and stays the default.
+
+### Source control panel
+
+Section header: padding 14 px 12 px 6 px, Plex Mono 700 10 px tracking `.14em` uppercase `#6C7783`,
+count on the right in `#E8913A`.
+Folder line: 22 px, `▤` + path, Plex Mono 11 px `#6C7783`, ellipsis on overflow.
+File row: 26 px, 8 px gap — status letter (Plex Mono 600 10 px, 12 px wide; **staged `#8FBFB4`,
+unstaged `#F0B476`**), file-type chip (Plex Mono 600 10 px, `#101720` text, radius 2, padding 4 px
+5 px; `md` `#BAC0C0`, `yml` `#F8C793`, `tsv` `#A8D6CB`, `sh` `#EFBCB0`, `json`/`php` `#C3A6CE`,
+`js` `#F0B476`), then the file name Plex Sans 12 px `#BAC0C0`.
+**Selected row:** background `#232C39`, 2 px `#E8913A` left border, left padding reduced by 2 px so
+the text does not shift, name `#F4F5F4` 500. Unselected rows carry `border-left: 2px solid
+transparent` so nothing moves on selection.
+Footer: 12 px padding, 1 px `#232C39` top, Plex Mono 11 px `#6C7783`, `3 staged · 3 unstaged`.
+
+### Explorer
+
+Rows are **24 px**. Folder: 8 px-wide chevron (`⌄` open `#E8913A`, `›` closed `#6C7783`), `▤`
+`#828D9A`, name Plex Sans 13 px (`#F4F5F4` when open, `#BAC0C0` when closed). Indent = 12 px + 16 px
+per level. Files use the same type chips as source control; a modified file shows a trailing `M`
+(Plex Mono 600 10 px `#8FBFB4`). Selected file: `#232C39`, 2 px `#E8913A` left border, name 500
+`#F4F5F4`.
+
+### Editor pane
+
+- **Agent rail** — 46 px, 1 px `#232C39` right. Holds per-block `M` markers aligned to the changed
+  region: a marker is Plex Mono 600 10 px, 20 px tall, centred; the active block is `#8FBFB4` on
+  `#232C39`, an unstaged block is `#C4741F` on transparent.
+- **Code grid** — `grid-template-columns: 44px 1fr`, `align-content: start`, padding 8 px 0,
+  Plex Mono 400 **13 px / 20 px**.
+  Line numbers: right-aligned, padding-right 12 px, `#5A6472`.
+  Line text: padding-right 18 px, `#BAC0C0`; markdown headings `#F4F5F4`; fenced-code markers
+  `#6C7783`; inline code and links `#F0B476`; a markdown link target `#A8D6CB`. Long lines **wrap**
+  (`text-wrap: pretty`) and keep their single line number — wrapped rows are how the pane behaves at
+  any width.
+- **Changed line (the core of this screen)** — line number `#8FBFB4` on `rgba(143,191,180,.12)` with
+  a **2 px `#8FBFB4` left border**; the text cell has the same `rgba(143,191,180,.12)` tint and text
+  `#F4F5F4`. No `+` glyph, no second row, no strikethrough. This is the current content, simply
+  marked as changed.
+- **Minimap strip** — 16 px, 1 px `#232C39` left, 4 × 4 px marks: `#6C7783` normal, `#8FBFB4` staged
+  change, `#C4741F` unstaged change.
+
+### Agent + terminal column (480 px)
+
+Conversation body: padding 14 px 16 px, 12 px gap, Plex Sans 13 px / 1.6 `#BAC0C0`; tool output and
+metadata in Plex Mono 12 px / 1.6 `#6C7783`; file paths and identifiers inline in Plex Mono `#F0B476`;
+lead-ins (`Why it was there.`) `#F4F5F4` 600.
+Prompt field: 44 px, `#101720`, **2 px `#E8913A` border + `0 0 0 2px rgba(232,145,58,.22)` ring**
+(the house focus state), radius 2, `›` `#E8913A`, 1 × 16 px `#E8913A` caret that blinks.
+Status lines: Plex Mono 11 px `#6C7783`; `bob` chip = `#E8913A` fill, `#171C22` text, radius 2;
+`⑂ bob2` `#A8D6CB`; `▸▸ auto mode on` `#E8913A`.
+Terminal: 150 px, 1 px `#232C39` top, Plex Mono 12 px / 1.7; prompt `[bob2]` `#A8D6CB`,
+`[~/code/bob]$` `#828D9A`, 7 × 14 px `#E8913A` blinking block cursor.
+
+### Status bar — 28 px, `#18202B`, 1 px `#232C39` top
+
+Plex Mono 11 px `#6C7783`, 16 px gap, 0 14 px padding: `⑂ bob2` `#E8913A` · `+22` `#A8D6CB` ·
+`−66` `#C4741F` · spacer · file path · `·` · `Ln 1, Col 1` · `UTF-8` · `LF` · language `#D4D9D8`.
+
+## Interactions & behaviour
+
+### The hover reveal (the one behaviour to get right)
+
+- **Trigger:** `mouseenter` anywhere on a changed line's text cell. **Dismiss:** `mouseleave`.
+  No click, no pin, no delay in the prototype. If you add a delay, keep it under 120 ms in and 0 ms
+  out — the gesture must feel like looking, not like opening something.
+- **What appears:** a panel pinned to the **top, right and bottom of the body row**, 496 px wide, so
+  it covers the whole agent + terminal column and nothing else. `#101720`, **2 px `#C4741F` left
+  border**, `box-shadow: 0 4px 16px rgba(23,28,34,.10)`, `overflow: hidden`, `z-index` above the
+  agent column.
+- **Panel header:** 46 px (the same 46 px as the editor header, so the first code line of both panes
+  starts at the same y), `#18202B`, 1 px `#232C39` bottom: `ORIGINAL` Plex Mono 700 10 px tracking
+  `.14em` `#C4741F`, then `before this change · same scroll` Plex Mono 11 px `#6C7783`, then
+  `hold hover` right-aligned in the same muted style.
+- **Panel body:** the **whole original file**, not a hunk — same lines, same order, same wrap points
+  and **the same vertical position for every line as in the editor pane**. In the prototype this is
+  achieved by scaling the type to the narrower column: `grid-template-columns: 35px 1fr`, font
+  `400 10.3px/20px` Plex Mono, gutter padding-right 9 px, text padding-right 11 px. The line-height
+  stays 20 px, so line *n* sits at the same y in both panes.
+  **In the real implementation, do it properly:** render the original text into the same layout the
+  editor uses and synchronise scroll offsets, so line *n* of the original is always level with line
+  *n* of the current file. The rule to satisfy: *the changed line and its previous version are on the
+  same horizontal line of the screen*.
+- **The old line inside the panel:** line number `#C4741F` on `rgba(196,116,31,.14)` with a 2 px
+  `#C4741F` left border; text cell same tint, text `#E4E7E6`. So: **teal = what is there now, amber
+  = what was there before.** Never green/red.
+- The editor keeps its own scroll while the overlay is open; the overlay follows it.
+
+### Other states
+
+- Hover on any list row (source control, explorer, menus): fill deepens one step
+  (`#18202B` → `#232C39`). No lift, no shadow, no opacity change, no scale on press.
+- Focus on a text field: 2 px `#E8913A` border + 2 px `rgba(232,145,58,.22)` ring.
+- Disabled: 40 % opacity, `cursor: not-allowed`.
+
+### Animation
+
+Only two things move:
+1. **The blinking period / caret** — `@keyframes blink { 0%,49% { opacity:1 } 50%,100% { opacity:0 } }`,
+   `1.1s steps(1, end) infinite`. Used on the wordmark period, the prompt caret and the terminal
+   cursor. Freeze under `prefers-reduced-motion`.
+2. **Colour transitions** — 160 ms `cubic-bezier(0.22, 1, 0.36, 1)`; 120 ms on small controls.
+
+No entrance animation, no slide, no fade for the overlay — it is there or it is not. No scroll
+reveal, no parallax.
+
+### Responsive behaviour
+
+Source control (300) and explorer (288) and the agent column (480) are fixed; the editor takes the
+rest. Below roughly 1400 px the design has not been specified — ask before inventing collapse
+behaviour. The hover panel is always 496 px and always anchored right.
+
+## State
+
+| State | Type | Notes |
+|---|---|---|
+| `activeView` | `'actual' \| 'original' \| 'preview' \| 'diff'` | Default `'actual'`. Persist per file. |
+| `hoveredChangedLine` | `lineNumber \| null` | Drives the overlay. Cleared on mouse-out and on scroll-end if the pointer leaves. |
+| `changedLines` | `Map<lineNumber, { current: string, previous: string, staged: boolean }>` | From the VCS diff of working tree vs HEAD/index. |
+| `originalText` | `string` | Full HEAD/index version of the open file, needed for the overlay. |
+| `editorScrollTop` | `number` | Mirrored into the overlay so the two panes stay in register. |
+| `selectedFile`, `stagedFiles`, `unstagedFiles` | — | Source control and explorer content. |
+
+Data needed: the file's working-tree content, its original content, and a line-level diff mapping
+current line numbers to previous content. The overlay must be able to render the original file
+immediately — pre-fetch it when a modified file is opened, not on hover.
+
+## Design tokens
+
+**Surfaces** `#101720` base · `#18202B` raised · `#232C39` selected/hover · `#3A424C` rule-strong
+**Text** `#F4F5F4` strong · `#E4E7E6` body-strong · `#BAC0C0` body · `#828D9A` dim · `#6C7783` muted ·
+`#5A6472` line numbers
+**Accent** `#E8913A` amber · `#C4741F` amber-deep (previous state) · `#F0B476` amber-soft (inline code)
+**Change** `#8FBFB4` current/changed, tint `rgba(143,191,180,.12)` · `#C4741F` previous, tint
+`rgba(196,116,31,.14)`
+**Syntax / chips** `#A8D6CB` string · `#F8C793` number-keyword · `#C3A6CE` structural · `#D8BEE4`
+directive · `#EFBCB0` selector · `#D4D9D8` property
+**Radius** 0 default · 2 px controls, chips, panels · 4 px window
+**Borders** 1 px `#232C39` hairline · 2 px accent, used only for the selection marker, the changed-line
+rule and a focused field
+**Shadow** dropdown `0 4px 16px rgba(23,28,34,.10)`; modal `0 16px 48px rgba(23,28,34,.18)`. Nothing else
+casts a shadow.
+**Row heights** 22 px meta · 24 px explorer · 26 px source-control file · 28 px status bar · 30 px menu ·
+34/38 px fields · 44 px title bar · 46 px panel headers
+**Type** IBM Plex Mono 400/500/600/700 — code, labels, all numbers; IBM Plex Sans 400/500/600 — UI
+text and prose. Code 13 px / 20 px. Labels 10 px, tracking `.14em`, uppercase. UI text 12–13 px.
+**Do not use** green or red for change, gradients, blur, emoji, white or pure black.
+
+## Assets
+
+None. No images, icons or fonts ship with this handoff. Both faces load from Google Fonts (IBM Plex
+Mono, IBM Plex Sans) — swap in the licensed binaries in the app. Every glyph in the design is a
+Unicode mark set in Plex Mono (`›` `⌄` `▤` `↑` `⑂` `·` `→` `▸▸` `✳` `└`); if the app already uses
+Lucide at stroke width 1.75, those are the sanctioned replacements for the folder and arrow marks.
+
+## Files
+
+- `03b-in-pane-diff.html` — the screen, standalone. Hover the teal line 31
+  (`- The scheduler fires it. Job \`mail-checker-ronde\`, every hour, on the hour.`) to see the
+  original overlay.
+- Source of truth in the design project: `Helder IDE.dc.html`, section **[ 03 ] Diff**, screen
+  **3b**. Section 3a in the same file shows the older full-screen side-by-side diff, kept for
+  reference; 3b replaces it for in-pane use.