314 Improve Tutorial UX

[ZanderCowboy]

Summary

Closes #314

• Replaces the blocking showcase-based tutorial sandbox with dismissible contextual tips on the real home screen
• Users can interact with the app freely while tips are shown; each tip is dismissed independently
• Removes showcaseview, the dedicated TutorialPage, and the linear ProductTourStep journey
• Drawer "Show app tips" replays tips in place without swapping to demo data
• Migrates legacy tour progress into the new dismissed-tip bitmask storage

Test plan

• Fresh install: welcome modal offers Skip tips / Show tips; choosing Show tips displays the first banner on home
• Dismiss each tip and confirm the next appears; app remains fully interactive throughout
• Skip tips from welcome modal marks onboarding complete with no banners
• Drawer refresh replays tips from the start on home
• Existing users mid-legacy-tour see reasonable tip resume after upgrade

Breaking changes

• Removed TutorialPageRoute and tutorial sandbox flow
• Removed showcaseview dependency

Platform	Screenshot / video
Android	pending
iOS	pending

[codecov]

Codecov Report

❌ Patch coverage is 83.07692% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.53%. Comparing base (96fbfed) to head (5d514c7).
⚠️ Report is 6 commits behind head on develop.

Files with missing lines	Patch %	Lines
.../implementations/utils/app_tips_storage_codec.dart	76.19%	5 Missing ⚠️
...ore/lib/src/application/product/product_event.dart	0.00%	3 Missing ⚠️
.../services/implementations/app_storage_service.dart	66.66%	2 Missing ⚠️
...ntrollers/implementations/app_tips_controller.dart	95.83%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #398      +/-   ##
===========================================
- Coverage    82.53%   82.53%   -0.01%     
===========================================
  Files           52       52              
  Lines         1638     1649      +11     
===========================================
+ Hits          1352     1361       +9     
- Misses         286      288       +2     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
83.2% Coverage on New Code
0.7% Duplication on New Code

See analysis details on SonarQube Cloud