feat: add Check for Updates command to native menu and Cmd+K palette

- Add APP_CHECK_FOR_UPDATES constant and menu item in menu.rs (between About and Settings)
- Wire onCheckForUpdates handler through useMenuEvents and useAppCommands
- Add test for app-check-for-updates dispatch

src-tauri/src/menu.rs

@@ -23,6 +23,7 @@ const NOTE_TRASH: &str = "note-trash";
 const EDIT_FIND_IN_VAULT: &str = "edit-find-in-vault";
 const VIEW_GO_BACK: &str = "view-go-back";
 const VIEW_GO_FORWARD: &str = "view-go-forward";
+const APP_CHECK_FOR_UPDATES: &str = "app-check-for-updates";
 
 const CUSTOM_IDS: &[&str] = &[
     APP_SETTINGS,
@@ -44,6 +45,7 @@ const CUSTOM_IDS: &[&str] = &[
     VIEW_ZOOM_RESET,
     VIEW_GO_BACK,
     VIEW_GO_FORWARD,
+    APP_CHECK_FOR_UPDATES,
 ];
 
 /// IDs of menu items that should be disabled when no note tab is active.
@@ -56,10 +58,15 @@ fn build_app_menu(app: &App) -> MenuResult {
         .id(APP_SETTINGS)
         .accelerator("CmdOrCtrl+,")
         .build(app)?;
+    let check_updates_item = MenuItemBuilder::new("Check for Updates...")
+        .id(APP_CHECK_FOR_UPDATES)
+        .build(app)?;
 
     Ok(SubmenuBuilder::new(app, "Laputa")
         .about(None)
         .separator()
+        .item(&check_updates_item)
+        .separator()
         .item(&settings_item)
         .separator()
         .services()
@@ -269,6 +276,7 @@ mod tests {
             "view-zoom-reset",
             "view-go-back",
             "view-go-forward",
+            "app-check-for-updates",
         ];
         for id in &expected {
             assert!(CUSTOM_IDS.contains(id), "missing custom ID: {id}");

src/hooks/useAppCommands.ts

@@ -122,6 +122,7 @@ export function useAppCommands(config: AppCommandsConfig): CommandAction[] {
     onSearch: config.onSearch,
     onGoBack: config.onGoBack,
     onGoForward: config.onGoForward,
+    onCheckForUpdates: config.onCheckForUpdates,
     activeTabPathRef: config.activeTabPathRef,
     handleCloseTabRef: config.handleCloseTabRef,
     activeTabPath: config.activeTabPath,

src/hooks/useMenuEvents.test.ts

@@ -19,6 +19,7 @@ function makeHandlers(): MenuEventHandlers {
     onSearch: vi.fn(),
     onGoBack: vi.fn(),
     onGoForward: vi.fn(),
+    onCheckForUpdates: vi.fn(),
     activeTabPathRef: { current: '/vault/test.md' } as React.MutableRefObject<string | null>,
     handleCloseTabRef: { current: vi.fn() } as React.MutableRefObject<(path: string) => void>,
     activeTabPath: '/vault/test.md',
@@ -161,6 +162,12 @@ describe('dispatchMenuEvent', () => {
     expect(h.onGoForward).toHaveBeenCalled()
   })
 
+  it('app-check-for-updates triggers check for updates', () => {
+    const h = makeHandlers()
+    dispatchMenuEvent('app-check-for-updates', h)
+    expect(h.onCheckForUpdates).toHaveBeenCalled()
+  })
+
   it('unknown event ID does nothing', () => {
     const h = makeHandlers()
     dispatchMenuEvent('unknown-event', h)

src/hooks/useMenuEvents.ts

@@ -19,6 +19,7 @@ export interface MenuEventHandlers {
   onSearch: () => void
   onGoBack?: () => void
   onGoForward?: () => void
+  onCheckForUpdates?: () => void
   activeTabPathRef: React.MutableRefObject<string | null>
   handleCloseTabRef: React.MutableRefObject<(path: string) => void>
   activeTabPath: string | null
@@ -58,6 +59,7 @@ function dispatchActiveTabEvent(id: string, h: MenuEventHandlers): boolean {
 function dispatchOptionalEvent(id: string, h: MenuEventHandlers): boolean {
   if (id === 'view-go-back') { h.onGoBack?.(); return true }
   if (id === 'view-go-forward') { h.onGoForward?.(); return true }
+  if (id === 'app-check-for-updates') { h.onCheckForUpdates?.(); return true }
   return false
 }