feat(ui): streamline workspace settings and remove sharing

Unify compact workspace controls and panel transitions, move directory actions into the context menu, and remove backlink UI.

Reorganize settings with searchable sections, per-setting resets, shortcut search, and accurate save feedback.

Remove sharing UI, APIs, authentication helpers, and storage code; provide a transactional cleanup script with retirement tests. Reject directories during orphan image cleanup and cover mixed-batch preservation.

web/vite.config.ts

@@ -33,21 +33,11 @@ export default defineConfig({
         this.emitFile({ type: 'asset', fileName: 'sw.js', source })
       },
     },
-    // 开发服务器中把分享地址 /s/{token} 交给分享页入口（生产环境由 Go 服务处理）
-    {
-      name: 'rawmark-share-route',
-      configureServer(server) {
-        server.middlewares.use((req, _res, next) => {
-          if (req.url?.startsWith('/s/')) req.url = '/share.html'
-          next()
-        })
-      },
-    },
   ],
   build: {
     rolldownOptions: {
-      // demo.html 为免登录的编辑器演示页，供自动化性能/交互测试使用；share.html 为只读分享页（/s/{token}）
-      input: { index: 'index.html', demo: 'demo.html', share: 'share.html' },
+      // demo.html 为免登录的编辑器演示页，供自动化性能/交互测试使用
+      input: { index: 'index.html', demo: 'demo.html' },
     },
   },
   worker: { format: 'es' },