Make build label open Play Store

[arpitagarwal1301]

Fixes #3852

• Make the build label in the navigation drawer a full-row accessible button.
• Open the app's Play Store listing, with an HTTPS fallback when no market app is available.
• Add focused coverage for the click target, market intent, and fallback behavior.

Verification

• ./gradlew checkCode assembleLocalDebug
• ./gradlew :app:testLocalDebugUnitTest --tests 'org.groundplatform.android.ui.home.HomeScreenFragmentTest'
• git diff --check

Limitations

• The external Play Store transition was not exercised on a physical device or emulator; intent behavior is covered with Robolectric.

[codecov]

Codecov Report

❌ Patch coverage is 68.42105% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.38%. Comparing base (f5984d1) to head (ac3106d).

Files with missing lines	Patch %	Lines
...oundplatform/android/ui/home/HomeScreenFragment.kt	73.33%	4 Missing ⚠️
...a/org/groundplatform/android/ui/home/HomeDrawer.kt	50.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3854      +/-   ##
============================================
+ Coverage     67.34%   67.38%   +0.03%     
- Complexity     1836     1839       +3     
============================================
  Files           407      407              
  Lines         10742    10755      +13     
  Branches       1416     1418       +2     
============================================
+ Hits           7234     7247      +13     
+ Misses         2763     2762       -1     
- Partials        745      746       +1     

Files with missing lines	Coverage Δ
...a/org/groundplatform/android/ui/home/HomeDrawer.kt	79.05% <50.00%> (-0.40%)	⬇️
...oundplatform/android/ui/home/HomeScreenFragment.kt	71.57% <73.33%> (+3.72%)	⬆️

... and 1 file with indirect coverage changes

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