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/sysinfo.ts

@@ -14,6 +14,7 @@
  */
 
 import { Ipc } from '../shared/ipc'
+import { t } from '../shared/i18n'
 import type { Client } from 'ssh2'
 import type { SysinfoMeta, SysinfoSample } from '../shared/sysinfo'
 
@@ -116,7 +117,7 @@ function pollOnce(id: string, state: PollState): void {
   if (state.stopped) return
   const client = clientProvider?.(id)
   if (!client) {
-    handleError(id, state, 'SSH 会话不存在或已断开')
+    handleError(id, state, t('main.sysinfo.sessionGone'))
     return
   }
 
@@ -124,7 +125,7 @@ function pollOnce(id: string, state: PollState): void {
     client.exec(COLLECT_CMD, (err: Error | undefined, stream) => {
       if (state.stopped) return
       if (err || !stream) {
-        handleError(id, state, err?.message || 'SSH exec 失败')
+        handleError(id, state, err?.message || t('main.sysinfo.execFailed'))
         return
       }
       let out = ''
@@ -220,7 +221,7 @@ function handleOutput(id: string, state: PollState, out: string): void {
       broadcastMeta(id, { hostname: parsed.hostname, os: parsed.osInfo })
     }
   } catch (err) {
-    handleError(id, state, `解析失败: ${(err as Error).message}`)
+    handleError(id, state, t('main.sysinfo.parseFailed', { message: (err as Error).message }))
     return
   }
   armNext(id, state)