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

src/main/diagnostics.ts

@@ -1,3 +1,4 @@
+import { mkdirSync } from 'node:fs'
 import { app, crashReporter, dialog, shell, BrowserWindow, type WebContents } from 'electron'
 import { formatErr, getLogDir, getLogPath, initLogger, log, logger } from './logger'
 
@@ -26,10 +27,22 @@ let fatalDialogOpen = false
  * native crashes, and the log file should exist before anything can fail. */
 export function initDiagnostics(isDev: boolean): void {
   // app.getPath('logs') is ~/Library/Logs/<name> on macOS, so the name must be
-  // set before we ask for the path or the folder is called "Electron".
+  // set first or the folder is called "Electron". The name later becomes the
+  // project's own, hence the paths are read here and pinned to "Helder".
   app.setName('Helder')
+  let pinErr: unknown = null
+  try {
+    for (const name of ['userData', 'logs'] as const) {
+      const dir = app.getPath(name)
+      mkdirSync(dir, { recursive: true }) // setPath throws on a directory that does not exist yet
+      app.setPath(name, dir)
+    }
+  } catch (e) {
+    pinErr = e // startup must survive this; the logger does not exist yet
+  }
 
   initLogger({ dir: app.getPath('logs'), mirror: isDev })
+  if (pinErr) logger.warn('session', 'could not pin the app paths — a rename may move them', { err: formatErr(pinErr) })
 
   // Native minidumps for crashes no JS handler can see. Local only — nothing is
   // uploaded anywhere (there is no server, and this is a personal tool).