feat: massive chat reliability + UX pass (web/desktop/mobile/vscode) (#593)

## Added Features
- Add VS Code save-as-image flow for assistant messages via webview bridge + native save dialog.
- Add hourly desktop update checks after startup.
- Add new tool output display mode: `Changes` (auto-expand edit/write/patch only; keep activity expanded; mode guidance text).
- Add GitHub PR attachment flow in chat input with PR picker + attached PR chip/details.
- Add mobile overlay presentation for GitHub Issue and PR pickers (shared with desktop picker content).

## Fixes
- Save-gate project icon updates until explicit Save; allow icon removal with same save-gated behavior.
- Restore clickable chat action buttons in sticky header mode (desktop + Firefox hit-target issue).
- Clamp sticky user messages to bounded chat height and allow internal scrolling.
- Prevent drawer context crash during iPad/tablet orientation switching.
- Improve text-selection action menu placement on narrow screens.
- Move assistant message time into clock tooltip; keep duration display clean.
- Hide `Link GitHub Issue` row in VS Code chat input area (GitHub flow is not yet ready there).
- Remove laggy close animation in text-selection popover; keep open motion/positioning behavior.
- Fetch branches when picker opens and cache empty; show loading state instead of false “No branches found”.
- Fix share-image export metadata rendering (theme background resolution, timestamp rendering, footer alignment).
- Scope MCP services status/toggles to active directory to avoid cross-project leakage.
- Improve long user-message clamp behavior (40% cap variant, hidden scrollbar, scroll shadows, expansion detection).
- Fix desktop `Check for Updates` menu handler; prevent duplicate checks; show clear success/error toasts.
- Stabilize long user-message scrolling behavior (follow-up hardening).
- Avoid premature web update failure on slower servers.
- Restore user message image previews + fullscreen gallery navigation payload.
- Repair desktop chat drag-and-drop image attachments when native drop coords are missing.
- Move GitHub issue linking entry into Add attachment menu.
- Align header context usage percentage visuals with context panel.
- Align `@` file search with active project in all runtimes.
- Route `@` file discovery through OpenCode SDK `find.files`; remove legacy `/api/fs/search` reliance.
- Make chat `@` mention behavior consistent with files-style behavior.
- Keep status-row todos in stable order after status changes; add compact status icons; replace noisy priority labels.

## Refactors / UX Consistency
- Simplify chat attachment model and remove project file picker path.
- Keep composer focused on `@` mention file flow.
- Use direct `Attach files` action in VS Code instead of attachment dropdown path.
- Unify issue/PR picker behavior between desktop and mobile overlays.

packages/web/src/api/files.ts

@@ -21,18 +21,6 @@ type WebDirectoryListResponse = {
   entries?: WebDirectoryEntry[];
 };
 
-type WebFileSearchResponse = {
-  root?: string;
-  directory?: string;
-  count?: number;
-  files?: Array<{
-    name?: string;
-    path?: string;
-    relativePath?: string;
-    extension?: string;
-  }>;
-};
-
 const toDirectoryListResult = (fallbackDirectory: string, payload: WebDirectoryListResponse): DirectoryListResult => {
   const directory = normalizePath(payload?.directory || payload?.path || fallbackDirectory);
   const entries = Array.isArray(payload?.entries) ? payload.entries : [];
@@ -78,35 +66,28 @@ export const createWebFilesAPI = (): FilesAPI => ({
       params.set('directory', directory);
     }
 
-    params.set('q', payload.query);
+    params.set('query', payload.query);
+    params.set('dirs', 'false');
+    params.set('type', 'file');
 
     if (typeof payload.maxResults === 'number' && Number.isFinite(payload.maxResults)) {
       params.set('limit', String(payload.maxResults));
     }
-    if (payload.includeHidden) {
-      params.set('includeHidden', 'true');
-    }
 
-    const response = await fetch(`/api/fs/search?${params.toString()}`);
+    const response = await fetch(`/api/find/file?${params.toString()}`);
 
     if (!response.ok) {
       const error = await response.json().catch(() => ({ error: response.statusText }));
       throw new Error((error as { error?: string }).error || 'Failed to search files');
     }
 
-    const result = (await response.json()) as WebFileSearchResponse;
-    const files = Array.isArray(result?.files) ? result.files : [];
+    const result = (await response.json()) as string[];
+    const files = Array.isArray(result) ? result : [];
 
-    return files
-      .filter((file): file is { path: string; relativePath?: string } =>
-        Boolean(file && typeof file.path === 'string')
-      )
-      .map((file) => ({
-        path: normalizePath(file.path),
-        preview: typeof file.relativePath === 'string' && file.relativePath.length > 0
-          ? [normalizePath(file.relativePath)]
-          : undefined,
-      }));
+    return files.map((relativePath) => ({
+      path: normalizePath(`${directory}/${relativePath}`),
+      preview: [normalizePath(relativePath)],
+    }));
   },
 
   async createDirectory(path: string): Promise<{ success: boolean; path: string }> {