feat(web): show hidden directories in workspace browser (#1331)

* feat(web): show hidden directories in workspace browser

Add optional includeHidden param to the machine list-directory RPC so the
WorkspaceBrowser can toggle hidden (dot-prefixed) entries. Default remains
filtered for backward compatibility; the toggle persists via localStorage.

* fix(web): disable show-hidden toggle while directory loading

Prevent overlapping list-directory requests with opposite includeHidden
values; the toggle is now disabled while a directory load is active.

web/src/lib/locales/en.ts

@@ -898,6 +898,7 @@ export default {
   'browse.goUp': 'Go up',
   'browse.empty': 'No subdirectories found',
   'browse.refresh': 'Refresh',
+  'browse.showHidden': 'Show hidden',
   'browse.startSession': 'Start Session',
   'browse.nav': 'Browse',
   'browse.noRootTitle': 'Workspace browsing is off',

web/src/lib/locales/zh-CN.ts

@@ -902,6 +902,7 @@ export default {
   'browse.goUp': '返回上层',
   'browse.empty': '未找到子目录',
   'browse.refresh': '刷新',
+  'browse.showHidden': '显示隐藏项',
   'browse.startSession': '启动会话',
   'browse.nav': '浏览',
   'browse.noRootTitle': '未启用 workspace 浏览',