Add notification-to-chat prefill flow

[ucguy4u]

Summary

This PR introduces the missing in-app notification deep-link slice for Agent Skills.
Goal: let users jump from a scheduled reminder card back into Mind chat with the related reminder context prefilled.

Core outcome:

• added an Open in chat action on reminder cards
• wired the Mind chat route to accept a prefilled draft without auto-sending
• added widget coverage for notification navigation and composer prefilling

Changes

Code

• Added:
  • notification-to-chat prefill helper and notification screen action
  • widget test covering notification card navigation into chat
• Updated:
  • ChatScreen to accept an optional initial draft
  • /mind/chat route to pass the prefill query parameter into chat
  • existing chat metadata test to verify draft prefilling

Logic

• reminder cards build a prompt from title, message, and schedule context
• chat opens with the composer pre-populated and cursor placed at the end
• empty or missing reminder context still falls back safely to a normal chat route

API Changes (if any)

• None.

Database Changes (if any)

• None.

Observability / Logging

• None.

Performance Impact

• Latency: negligible
• Throughput: none
• Memory/CPU: negligible

Risks

• prompt wording for reminder context is heuristic and may need later UX refinement
• this only covers the in-app notification management path, not OS notification tap payloads
• Rollback plan:
  • revert this PR

Testing

• Unit tests:
  • flutter test test/features/agent_chat/presentation/screens/chat_screen_metadata_test.dart test/features/agent_chat/presentation/screens/notifications_screen_test.dart
• Integration tests:
  • none
• Manual testing:
  • not run

Deployment Notes

• Config changes:
  • none
• Order of deployment:
  • normal app rollout

Related Commits

• fix(agent-chat): prefill chat from reminder cards

Notes

• Addresses the notification deep-link acceptance slice under Add built-in Agent Skills pack and notification management #281 but does not close Add built-in Agent Skills pack and notification management #281; the broader built-in skill pack scope remains open.

[github-actions]

Plugin Module Size Gate

Policy: modules over 3 MB must be delivered as plugins; plugin modules over 5 MB must document cache management.

Module	Size	Type	Status
No changed Dart/Flutter modules detected	n/a	n/a	OK

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

🚀 PR Quick Check Summary

Check	Status	Description
PR Validation	❌ failure	Title format, docs, bundled model guardrail
Code Quality	✅ success	Analyze, formatting
Core Tests	✅ success	Core package unit tests

💡 Note: Full app tests, coverage reports, and security scans run on merge to main.

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