feat: Phase O Windows-native integration + settings search

- Taskbar progress bar: renderer pushes summarizeQueue aggregate over a new
  taskbar:progress channel (App store subscription); setProgressBar normal/error
- System tray (src/main/tray.ts) + minimize-to-tray (Settings.minimizeToTray);
  close hides to tray, isQuitting guards real exits; icon via getAppIconPath()
  (build/icon.ico added to extraResources)
- Jump list: app.setUserTasks "Open AeroFetch" (thumbnail toolbar deferred)
- Settings search: filters the ~11 SettingsView cards live by text match

Overlay badge deferred (needs a drawn NativeImage). typecheck + test (192) +
build all clean. Roadmap: Phase O COMPLETE.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/main/tray.ts

@@ -0,0 +1,55 @@
+/**
+ * System tray + minimize-to-tray (Phase O). When Settings.minimizeToTray is on,
+ * closing the window hides it to the tray instead of quitting; the tray's "Quit"
+ * really exits. The tray gives the app a background presence (a natural home for
+ * the watched-source sync) and a quick show/quit menu.
+ */
+import { app, Tray, Menu, nativeImage, type BrowserWindow } from 'electron'
+import { getAppIconPath } from './binaries'
+
+let tray: Tray | null = null
+// True once the user has chosen to really quit (tray menu, or app.quit from the
+// updater) — lets the window 'close' handler tell "hide to tray" from "exit".
+let quitting = false
+
+export function isQuitting(): boolean {
+  return quitting
+}
+
+export function markQuitting(): void {
+  quitting = true
+}
+
+function show(getWindow: () => BrowserWindow | null): void {
+  const win = getWindow()
+  if (!win) return
+  if (win.isMinimized()) win.restore()
+  win.show()
+  win.focus()
+}
+
+/** Create the tray icon + menu once. No-op if it already exists or the icon is missing. */
+export function createTray(getWindow: () => BrowserWindow | null): void {
+  if (tray) return
+  const icon = nativeImage.createFromPath(getAppIconPath())
+  // Without a usable icon a Windows tray entry is invisible/unclickable, which is
+  // worse than no tray — so skip it rather than ship a dead tray.
+  if (icon.isEmpty()) return
+
+  tray = new Tray(icon)
+  tray.setToolTip('AeroFetch')
+  tray.setContextMenu(
+    Menu.buildFromTemplate([
+      { label: 'Show AeroFetch', click: () => show(getWindow) },
+      { type: 'separator' },
+      {
+        label: 'Quit AeroFetch',
+        click: () => {
+          quitting = true
+          app.quit()
+        }
+      }
+    ])
+  )
+  tray.on('click', () => show(getWindow))
+}