fix(tv): guard fullscreen back handling

[ucguy4u]

Summary

Follow-up to the v0.0.5 release prep merge. This PR adds the remaining IPTV fullscreen Back handling and stabilizes focused widget tests against the current player settings/drawer UI.

Changes

• Add route/back handling for fullscreen IPTV playback on mobile and embedded TV screen bodies.
• Update IPTV drawer/app-bar tests to invoke stable UI callbacks instead of brittle hit-test coordinates.
• Update player background-mode tests for the current Player settings → Listen only action.
• Add the missing PiP preference hook to the backgrounding coordinator spy.

Testing

• cd packages/feature_iptv && flutter analyze lib test --no-fatal-infos --no-fatal-warnings
• cd packages/feature_iptv && flutter test test/iptv/presentation/screens/iptv_screen_test.dart test/iptv/presentation/tv/iptv_tv_screen_test.dart test/iptv/iptv_cast_ui_test.dart test/iptv/iptv_cast_notifier_test.dart test/presentation/widgets/video_player_widget_background_modes_test.dart --reporter=compact
• cd packages/platform_player && flutter analyze lib/src/services/flutter_chrome_cast_controller.dart test/flutter_chrome_cast_controller_test.dart --no-fatal-infos --no-fatal-warnings
• cd packages/platform_player && flutter test test/flutter_chrome_cast_controller_test.dart --reporter=compact
• cd app && flutter analyze lib/core/app/tv_router.dart lib/main_tv.dart test/core/app/tv_router_test.dart test/main_tv_debug_playlist_test.dart --no-fatal-infos --no-fatal-warnings
• cd app && flutter test test/core/app/tv_router_test.dart test/main_tv_debug_playlist_test.dart --reporter=compact
• git diff --check

[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
packages/feature_iptv	1.17 MB	bundled	WARN: 1-3 MB requires PR size justification

[github-actions]

🚀 PR Quick Check Summary

Check	Status	Description
PR Validation	✅ success	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.

View Details

[github-actions]

🚀 PR Quick Check Summary

Check	Status	Description
PR Validation	✅ success	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.

View Details

[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