feat: add LifeTrack detail screen

[ucguy4u]

Summary

• add a LifeTrack detail screen with milestone accordions, action item status updates, and requirement input handling
• wire track cards and routing so /life-track/:trackId opens the detail view from the list screen
• cover milestone rendering, status mutation, text/bool persistence, and injected document/date pickers with widget tests

Validation

• flutter analyze lib/features/life_track lib/core/routing/app_router.dart test/features/life_track/presentation/screens/track_detail_screen_test.dart
• flutter test --no-pub test/features/life_track/presentation/screens/track_detail_screen_test.dart

Closes #346

[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]

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

[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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