Task 15 of the slice plan. Strategy §4.1 immediate-reward
toast. celebrate(noteId) deterministically picks one of the
4 reward copies via SHA-256(noteId)[0] % 4, then forwards to
the injected send() callback (which Task 30 wires to a real
electron Notification). Skips silently when isSupported() is
false (denied OS permission), and swallows send() errors so
that capture path never fails because of a notification quirk.
Verification: `npx vitest run tests/unit/NotificationService.test.ts`
3 passed.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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