Carve src/gui/app.go into the new src/ui package:
- run.go: process lifecycle (single instance, app/window, tray, startup
timing).
- mainwindow.go: view assembly + the app.Service event listener.
Route every widget update driven by Service events through fyne.Do so the
run goroutine (executeRun) no longer mutates Fyne widgets directly. Also
wrap serveSingleInstance's Show/RequestFocus, which runs on the Accept
goroutine. (Resolves refactoring problem #4.)
fyne.Do/DoAndWait only exist in Fyne v2.6+, so upgrade fyne.io/fyne/v2
v2.5.3 -> v2.6.3. Mark the tray Quit item IsQuit so Fyne's
addMissingQuitForMenu reuses it instead of appending a second, localized
Quit now that v2.6 ships Russian translations.
go build / go vet / go test -race all clean.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
mixeme
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