[PM-33518] feat: Add isInAppUpgradeAvailableFlow to PremiumStateManager

[SaintPatrck]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-33518

📔 Objective

Add a consolidated isInAppUpgradeAvailableFlow to PremiumStateManager that combines isInAppBillingSupportedFlow and the MobilePremiumUpgrade feature flag into a single observable signal.

Stacked on PM-33517 PR (settings/premium management)

Changes

• Add isInAppUpgradeAvailableFlow: StateFlow<Boolean> to PremiumStateManager interface
• Implement in PremiumStateManagerImpl by combining billing support and feature flag flows
• Add unit tests for the new flow covering all flag/billing combinations

[github-actions]

🤖 Bitwarden Claude Code Review

Overall Assessment: APPROVE

This PR adds isInAppUpgradeAvailable(): Boolean to PremiumStateManager, a synchronous getter that returns true when both BillingRepository.isInAppBillingSupportedFlow.value and the MobilePremiumUpgrade feature flag are enabled. The most recent commit intentionally converted the API from a StateFlow<Boolean> to a simple getter. Unit tests cover all four boolean combinations of the two inputs, and the test fixture adds a getFeatureFlag mock that mirrors the existing flow-based mock. KDoc is present on the new interface member.

Code Review Details

No findings.

[github-actions]

Checkmarx One – Scan Summary & Details – 06af60e4-33f6-4a2b-b424-0f8823a034fd

Great job! No new security vulnerabilities introduced in this pull request

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.81%. Comparing base (985562e) to head (b4dd755).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6795      +/-   ##
==========================================
+ Coverage   85.58%   85.81%   +0.23%     
==========================================
  Files         830      859      +29     
  Lines       61506    62519    +1013     
  Branches     8590     8602      +12     
==========================================
+ Hits        52641    53652    +1011     
+ Misses       5900     5898       -2     
- Partials     2965     2969       +4     

Flag	Coverage Δ
app-data	17.01% <100.00%> (-0.34%)	⬇️
app-ui-auth-tools	20.32% <0.00%> (-0.01%)	⬇️
app-ui-platform	15.91% <0.00%> (+0.39%)	⬆️
app-ui-vault	26.37% <0.00%> (+0.48%)	⬆️
authenticator	6.66% <0.00%> (-0.01%)	⬇️
lib-core-network-bridge	4.20% <0.00%> (-0.01%)	⬇️
lib-data-ui	1.00% <0.00%> (-0.01%)	⬇️

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