fix(desktop): make the Windows app icon match native icon size

The shipped artwork bakes in the macOS-style ~10% transparent margin
(content covered only ~80% of the canvas), so the taskbar/titlebar icon
rendered visibly smaller than neighboring Windows apps, which draw
full-bleed.

- Regenerate assets/icon.ico full-bleed (~95% coverage) from the same
  art, with the standard 16-256px frames. This feeds both the exe stamp
  (set-exe-identity via rcedit) and the installer.
- On Windows, resolve the BrowserWindow icon from the full-bleed ico
  (resources/icon.ico, shipped via extraResources) before falling back
  to the padded apple-touch PNG.

macOS is untouched: the dock icon and icon.icns keep the padded art,
which is correct there.

apps/desktop/electron/main.ts

@@ -681,7 +681,15 @@ const WINDOW_BUTTON_POSITION = {
 // (pure + unit-testable); computeNativeOverlayWidth() applies it per platform.
 // It's only the pre-layout fallback — the renderer measures the exact overlay
 // width live via the Window Controls Overlay API.
+// The apple-touch PNG bakes in the macOS-style ~10% margin, which is correct
+// for the dock but renders visibly smaller than neighboring taskbar icons on
+// Windows, where icons are full-bleed. Windows prefers the full-bleed
+// assets/icon.ico (shipped to resources/ via extraResources) and only falls
+// back to the padded PNG if the ico is missing.
 const APP_ICON_PATHS = [
+  ...(IS_WINDOWS
+    ? [path.join(process.resourcesPath ?? '', 'icon.ico'), path.join(APP_ROOT, 'assets', 'icon.ico')]
+    : []),
   path.join(APP_ROOT, 'public', 'apple-touch-icon.png'),
   path.join(APP_ROOT, 'dist', 'apple-touch-icon.png'),
   path.join(unpackedPathFor(APP_ROOT), 'dist', 'apple-touch-icon.png')