feat: improve chat streaming UX and add Mermaid diagram rendering (#438)

* feat: show current branch in empty chat state

* fix: display current git branch for worktrees and update them with branch change

* refactor: improve read tool output parsing with structured data

* feat: add support for message part delta events

* fix(chat): improve streaming rendering, scroll behavior, and assistant action visibility

* feat: Add mermaid diagram support to chat markdown rendering

* fix: update table download functionality to include success notification and remove unused MarkdownRenderer import

* refactor: streamline Streamdown component props for improved readability

* fix: preserve Streamdown code-block markers and use native Tauri cache clearing

* feat: add context overview panel to view conversation details

packages/ui/src/lib/desktop.ts

@@ -487,3 +487,18 @@ export const fetchDesktopInstalledApps = async (
     return { apps: [], success: false, hasCache: false, isCacheStale: false };
   }
 };
+
+export const clearDesktopCache = async (): Promise<boolean> => {
+  if (!isTauriShell() || !isDesktopLocalOriginActive()) {
+    return false;
+  }
+
+  try {
+    const tauri = (window as unknown as { __TAURI__?: TauriGlobal }).__TAURI__;
+    await tauri?.core?.invoke?.('desktop_clear_cache');
+    return true;
+  } catch (error) {
+    console.warn('Failed to clear cache', error);
+    return false;
+  }
+};