feat: multi-language interface (zh-CN/zh-TW/en/ja), multilingual offline changelog, settings robustness

i18n
- shared/i18n: dependency-free t() with flat per-namespace dictionaries
  (common/settings/workspace/terminal/ssh/panels/main), zh-CN fallback
- language picker in Settings -> System; antd ConfigProvider locale follows it
- main process tracks the language too: tray menu, close prompt, ssh/sftp/
  zmodem errors and the log TUI marker are translated; tray rebuilds on change

changelog
- CHANGELOG.md (zh-CN canonical) + .zh-TW/.en/.ja, bundled via ?raw and read
  per interface language with per-version fallback to zh-CN (no network)
- sync-changelog.cjs merges RELEASE_NOTES[.<lang>].md per release; release.cjs
  refuses to publish without a zh-CN entry for the version

settings robustness
- closeAction 'ask' survives the sanitizer (was silently coerced to 'tray',
  which made the 'ask every time' option dead)
- highlight rules are repaired instead of dropped: string priority, 0/1
  enabled, missing fg colour; unknown fields preserved
- load-time warnings are written to settings-warnings.log (deduped, capped)

terminal/UI
- configurable terminal toolbar: open working directory (default on), session
  log recording (off), open logs folder (off)
- global shortcut field records key combos (modifier or F-key required)
- input suggestions + command history default to off, with a one-time reset
  migration for existing installs
- settings dialog scrolling fixed (antd v6 renamed the tabs container), theme
  gallery nested scrollbar removed, joined segmented pickers with readable
  selected-state text

tests: settings-store.mjs (15 checks) added; commands-store.mjs updated for
the new off-by-default history setting

src/shared/i18n/dicts/en/main.ts

@@ -0,0 +1,56 @@
+/** Namespace: main (main-process strings: tray, close prompt, updater). Owner: main process. */
+const main: Record<string, string> = {
+  'main.tray.showWindow': 'Show main window',
+  'main.tray.closeAction': 'Close button action',
+  'main.tray.askEveryTime': 'Ask every time',
+  'main.tray.minimizeToTray': 'Minimize to tray',
+  'main.tray.exitDirectly': 'Exit directly',
+  'main.tray.exit': 'Exit',
+  'main.tray.balloonTitle': 'Minimized to tray',
+  'main.tray.balloonContent': 'Terminal sessions keep running in the background. Click the tray icon to restore the window.',
+  'main.tray.closeTitle': 'Close OpenTerminal',
+  'main.tray.closeMessage': 'Minimize to tray, or exit now?',
+  'main.tray.closeDetail': 'Minimizing to tray keeps your terminal sessions running.',
+  'main.tray.rememberChoice': 'Remember my choice, never ask again',
+
+  'main.updater.feedFailed': 'Domestic feed: {gitea}; GitHub: {github}',
+
+  'main.ssh.connectTimeout': 'Connection timed out ({host}:{port})',
+  'main.ssh.saveFingerprintFailed': 'Failed to save the host fingerprint: {detail}',
+  'main.ssh.hostKeyRejected': 'The user rejected the host key',
+  'main.ssh.connectFailed': 'Connection failed {host}:{port}: {detail}',
+  'main.ssh.shellOpenFailed': 'Could not open the SSH shell ({host}:{port}): {detail}',
+  'main.ssh.initFailed': 'SSH connection initialization failed ({host}:{port}): {detail}',
+  'main.ssh.readKeyFailed': 'Could not read the private key file {path}: {detail}',
+
+  'main.sftp.sessionGone': 'The SSH session does not exist or has disconnected',
+  'main.sftp.deleteFailed': 'Delete failed: {detail}',
+  'main.sftp.invalidMode': 'Invalid permission value: {mode}',
+  'main.sftp.invalidUidGid': 'Invalid uid/gid',
+  'main.sftp.commandExitCode': 'Command exited with code {code}',
+  'main.sftp.cancelled': 'Cancelled',
+
+  'main.zmodem.transferFailed': 'Transfer failed',
+  'main.zmodem.transferTimeout': 'Transfer timed out',
+  'main.zmodem.sendFailed': 'Sending failed',
+  'main.zmodem.uploadFailed': 'Upload failed',
+  'main.zmodem.receiveFailed': 'Receiving failed',
+  'main.zmodem.abnormal': 'ZMODEM transfer error',
+  'main.zmodem.cancelled': 'Cancelled',
+  'main.zmodem.offerTimedOut': 'No files selected, cancelled',
+  'main.zmodem.sessionInvalid': 'The session is no longer valid',
+  'main.zmodem.sessionCreateFailed': 'Could not establish the ZMODEM session',
+  'main.zmodem.noSaveDir': 'No save directory specified',
+  'main.zmodem.noFiles': 'No files selected',
+
+  'main.ipc.connectionMissing': 'Connection bookmark not found ({id})',
+
+  'main.sysinfo.sessionGone': 'SSH session is missing or disconnected',
+  'main.sysinfo.execFailed': 'SSH exec failed',
+  'main.sysinfo.parseFailed': 'Parse failed: {message}',
+  'main.pty.serviceNotReady': 'SSH session service is not initialised yet',
+  'main.pty.missingConnectionId': 'SSH session is missing its connectionId',
+  'main.log.tuiOmitted': 'full-screen (TUI) output omitted'
+}
+
+export default main