feat: add visual todo list panel

- Add TodoPanel component to display TodoWrite tool calls
- Create todos Svelte store to track todo state
- Emit todo-update Tauri event when TodoWrite is called
- Add todo button to status bar (next to session history)
- Display todos with status icons, progress bar, and completion count
- Real-time updates as I work through tasks

Closes #132

src/routes/+page.svelte

@@ -35,6 +35,7 @@
   import CloseAppConfirmModal from "$lib/components/CloseAppConfirmModal.svelte";
   import MemoryBrowserPanel from "$lib/components/MemoryBrowserPanel.svelte";
   import { debugConsoleStore } from "$lib/stores/debugConsole";
+  import { initializeTodoListener, cleanupTodoListener } from "$lib/stores/todos";
 
   let initialized = false;
   let updateNotification: UpdateNotification | undefined = $state(undefined);
@@ -445,6 +446,9 @@
       // Initialize Discord RPC
       await initializeDiscordRpc();
 
+      // Initialize todo listener
+      await initializeTodoListener();
+
       // Listen for window close requests
       const unlisten = await listen("window-close-requested", () => {
         handleCloseRequest();
@@ -461,6 +465,7 @@
     if (initialized) {
       cleanupTauriListeners();
       cleanupNotificationSync();
+      cleanupTodoListener();
       stopDiscordRpc();
       window.removeEventListener("keydown", handleGlobalKeydown);
       initialized = false;