Add system notifications + sounds

[ThallesP]

as the title suggests, it adds notifications when agents terminates to run. it also does push notifications (no idea on what those are called on the desktop side).

the sound is a copyright free one (new notification - 3 from https://pixabay.com/sound-effects/search/notification/).

Note

Add system notifications and completion sounds for agent turn settlement

• Adds a notification pipeline in __root.tsx that detects newly settled agent turns (success/error/interrupted), deduplicates across snapshot syncs, and dispatches system notifications and/or audio when the app is backgrounded.
• Adds notification and sound settings to the Settings page (_chat.settings.tsx): toggle system notifications (with permission request), choose Off/Default/Custom completion sound, upload/validate custom audio, test playback, and restore defaults.
• Stores custom notification sounds in IndexedDB via notificationSoundStorage.ts, with object URL caching and cleanup.
• Extends AppSettingsSchema with five new notification fields (enableSystemNotifications, enableCompletionSound, notificationSoundSelection, etc.), with backward-compatible defaults so existing persisted settings are unaffected.
• Behavioral Change: notifications and sounds only fire while the app is backgrounded (document hidden or window unfocused); historical turns at load time are seeded into the dedupe state and suppressed.

^{Macroscope summarized d49ae01.}

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[ThallesP]

no idea if a limit is necessary, dont want to blow up user's IndexedDB (even if he really wants to). Life would be so much easier if I could just read a path at runtime but unfortunately browsers thinks thats a security nightmare (wdym I can't read a .env path on your local file system??!?)

[ThallesP]

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[UtkarshUsername]

#976 is being worked on with comments from Julius

[ThallesP]

thanks missed that somehow

[ThallesP]

#976 is being worked on with comments from Julius

@UtkarshUsername I see no sound notification though, maybe I can focus on sound only after that's merged? Is that something desired?

[UtkarshUsername]

@UtkarshUsername I see no sound notification though, maybe I can focus on sound only after that's merged? Is that something desired?

I am not sure if that's something the maintainers want, but you can try and see after that one is merged