feat: generate stub .app bundle for Launchpad/Spotlight integration on macOS

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -13,6 +13,20 @@ The explicit URL form is required because Homebrew defaults to GitHub for tap
 names. When this repo is mirrored to GitHub at the public-flip, the URL becomes
 implicit and the tap command shortens to `brew tap seth/tap`.
 
+### Launchpad / Spotlight integration (macOS)
+
+`brew install` puts `glabels-qt` and `glabels-batch-qt` on your `$PATH` as CLI
+binaries. To get a Launchpad icon (and Spotlight matches), copy the bundled
+`.app` wrapper to `/Applications/`:
+
+```
+cp -R "$(brew --prefix glabels-qt)/glabels-qt.app" /Applications/
+```
+
+Re-run that one-liner after each `brew upgrade glabels-qt` so the wrapper
+points at the latest version. (Brew formulas can't write to `/Applications/`
+directly without elevation; the `cp` is the user's one-time step.)
+
 ## Formulae
 
 | Formula | Description |