Restore desktop notification sounds by default, add a persisted Play sound setting, and group notification permission and testing in a dedicated Notifications section.
Quitting the desktop app now shuts down the daemon it started, so
"restart the app" is a complete reset users can act on without first
learning what a daemon is. The old default kept it alive; the toggle
under Settings > Host still opts back in.
Existing installs already persisted `keepRunningAfterQuit: true` from
the old default, so a new default alone would only reach fresh installs.
A one-time migration resets it, and an explicit toggle afterwards
persists the migration flag and is never overridden again.
Only a desktop-managed daemon is stopped — one started with
`paseo daemon start` is left alone.
Move daemon management and release channel settings out of the renderer's
AsyncStorage and into a desktop-owned settings store persisted by the main
process. Adds a "Keep daemon running after quit" option, a daemon lifecycle
section in settings, and a one-time migration of legacy renderer-owned
desktop settings.
Glen Stampoultzis