feat: shortcut recorder, configurable terminal toolbar, offline changelog

- Global shortcut setting: press-to-record input (Esc cancels, Backspace
  clears); requires a modifier or F-key so plain typing can't be hijacked
- Terminal toolbar: three settings-gated buttons — session-log record
  (default off), open logs dir (default off), open working directory
  (default on, new; local sessions only, cwd tracked via cd/OSC 7)
- Input suggestions + command history now default off, with a one-time
  migration that resets persisted true values for existing installs
- Settings dialog: fix broken scrolling — antd v6 renamed the Tabs scroll
  container to .ant-tabs-body-holder; theme gallery drops its nested
  scroll (single outer scrollbar)
- Offline changelog: CHANGELOG.md at repo root bundled via ?raw; About tab
  reads it first, network sources stay as fallback; scripts/sync-changelog.cjs
  merges RELEASE_NOTES.md per release (release.cjs fails without an entry)
- commands.ts history prefs default aligned with new off-by-default

src/shared/settings.ts

@@ -40,6 +40,12 @@ export interface TerminalSettings {
   historyEnabled: boolean
   /** max entries kept in command history */
   historyLimit: number
+  /** terminal toolbar: session-log record button */
+  showRecButton: boolean
+  /** terminal toolbar: open logs folder button */
+  showOpenLogsButton: boolean
+  /** terminal toolbar: open working-directory button (local sessions only) */
+  showOpenCwdButton: boolean
   /** accent color for the active tab outline, rail indicator and SSH badges */
   tabAccentColor: string
 }
@@ -117,9 +123,12 @@ export const DEFAULT_SETTINGS: AppSettings = {
     autoWrap: true,
     copyOnSelect: false,
     pasteRiskConfirm: true,
-    suggestEnabled: true,
-    historyEnabled: true,
+    suggestEnabled: false,
+    historyEnabled: false,
     historyLimit: 100,
+    showRecButton: false,
+    showOpenLogsButton: false,
+    showOpenCwdButton: true,
     tabAccentColor: '#3fb950'
   },
   customThemes: [],