fixing lines overlapping

src/main/config.ts

@@ -10,6 +10,7 @@ import { join } from 'node:path'
  *                         and FONT SIZE live here (as CSS vars), not in the JSON
  * Effective value = config.json over config.default.json, merged key by key.
  */
+/** View a changed file opens in. 'diff' is the full-screen side-by-side overlay. */
 export type DiffMode = 'original' | 'updated' | 'diff'
 /** Soft wrap of long lines: never, always, or only in Markdown files. */
 export type WordWrap = 'off' | 'on' | 'markdown'
@@ -55,7 +56,7 @@ export interface HelderConfig {
 export const DEFAULTS: HelderConfig = {
   ai: { command: 'claude', autoLaunch: true },
   editor: { autoSave: false, tabSize: 4, wordWrap: 'markdown' },
-  git: { confirmDiscard: true, confirmStage: false, confirmUnstage: false, defaultDiffMode: 'diff', refreshInterval: 10000 },
+  git: { confirmDiscard: true, confirmStage: false, confirmUnstage: false, defaultDiffMode: 'updated', refreshInterval: 10000 },
   files: { exclude: [], followGitignore: false },
   terminal: {
     shell: null,