feat: wire up deeplink2 plugin with desktop app

[devin-ai-integration]

Summary

This PR wires up the deeplink2 plugin to handle deep link URLs in the desktop app. When a deep link URL (e.g., hypr://notification?key=xyz) is received by the OS, the plugin now parses it and emits a DeepLinkEvent that the frontend listens for and navigates accordingly.

Changes:

• Added tauri-plugin-deep-link dependency to hook into OS-level deep link events
• Modified plugins/deeplink2/src/lib.rs to listen for deep link URLs via on_open_url and emit DeepLinkEvent
• Updated apps/desktop/src/routes/__root.tsx to listen for DeepLinkEvent and navigate to the appropriate route
• Updated /notification route to validate the key search param from NotificationSearch

Review & Testing Checklist for Human

• Verify notification route behavior: The notification route currently logs the search params and redirects to /app/main. Confirm this is the intended behavior or if additional handling is needed for the key param.
• Test deep link end-to-end: Build the desktop app and test that clicking a hypr://notification?key=test link opens the app and triggers the navigation. This requires OS-level deep link registration.
• Verify deep link URL format: The parser expects URLs like hypr://notification?key=xyz. Confirm this matches the format used when creating notifications with URLs.

Test Plan

1. Build the desktop app
2. Register the hypr:// scheme with the OS (should happen automatically via Tauri config)
3. Create a notification with a URL like hypr://notification?key=test123
4. Click the notification and verify the app opens and navigates correctly
5. Check console logs for "notification deeplink received" with the correct search params

Local Testing

• Desktop app builds and runs successfully (ONBOARDING=0 pnpm -F desktop tauri dev)
• All CI checks pass (fmt, linux CI, macOS CI)

Notes

• The e2e tests failed due to missing binary (environment issue, not related to these changes)
• Session: https://app.devin.ai/sessions/ae8763e8d8ff4621b6d6c9b8b40d3d46
• Requested by: @yujonglee

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