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/ui/src/stores/useMcpStore.ts

@@ -25,6 +25,14 @@ const normalizeDirectory = (directory: string | null | undefined): string | null
 
 const toKey = (directory: string | null | undefined): string => normalizeDirectory(directory) ?? '__global__';
 
+const getMcpApiClient = (directory: string | null | undefined) => {
+  const normalized = normalizeDirectory(directory);
+  if (!normalized) {
+    return opencodeClient.getApiClient();
+  }
+  return opencodeClient.getScopedApiClient(normalized);
+};
+
 export const computeMcpHealth = (status: McpStatusMap | null | undefined): McpHealth => {
   const entries = Object.entries(status ?? {});
   const connected = entries.filter(([, s]) => s?.status === 'connected').length;
@@ -73,8 +81,8 @@ export const useMcpStore = create<McpStore>()(
       }
 
       try {
-        const api = opencodeClient.getApiClient();
-        const result = await api.mcp.status(directory ? { directory } : undefined);
+        const api = getMcpApiClient(directory);
+        const result = await api.mcp.status();
         const data = (result.data ?? {}) as McpStatusMap;
 
         set((state) => ({
@@ -93,18 +101,17 @@ export const useMcpStore = create<McpStore>()(
 
     connect: async (name, directory) => {
       const normalized = normalizeDirectory(directory ?? useDirectoryStore.getState().currentDirectory);
-      const api = opencodeClient.getApiClient();
-      await api.mcp.connect({ name, ...(normalized ? { directory: normalized } : {}) }, { throwOnError: true });
+      const api = getMcpApiClient(normalized);
+      await api.mcp.connect({ name }, { throwOnError: true });
       await get().refresh({ directory: normalized, silent: true });
     },
 
     disconnect: async (name, directory) => {
       const normalized = normalizeDirectory(directory ?? useDirectoryStore.getState().currentDirectory);
-      const api = opencodeClient.getApiClient();
-      await api.mcp.disconnect({ name, ...(normalized ? { directory: normalized } : {}) }, { throwOnError: true });
+      const api = getMcpApiClient(normalized);
+      await api.mcp.disconnect({ name }, { throwOnError: true });
       await get().refresh({ directory: normalized, silent: true });
     },
 
   }))
 );
-