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/main/ipc.ts

@@ -3,6 +3,7 @@ import fontList from 'font-list'
 import { homedir } from 'os'
 import { statSync } from 'fs'
 import { Ipc, type AppInfo, type LayoutMeta, type PtyCreateOptions } from '../shared/ipc'
+import { t } from '../shared/i18n'
 import type { HostKeyAction, SessionOpenOptions, SshConnection, SshConnectionInput } from '../shared/connections'
 import { getLayout, listLayouts, saveLayout, deleteLayout } from './layouts'
 import { startPolling, stopPolling } from './sysinfo'
@@ -64,7 +65,7 @@ export function registerIpc(): void {
     broadcast: (channel, ...args) => broadcast(channel, ...args),
     getConnection: (connectionId) => {
       const found = connectionsStore.listConnections().find((c) => c.id === connectionId)
-      if (!found) throw new Error(`连接书签不存在 (${connectionId})`)
+      if (!found) throw new Error(t('main.ipc.connectionMissing', { id: connectionId }))
       return found
     },
     getSecret: (conn, field) => connectionsStore.getSecret(conn, field),