Refactor show sign out confirmation dialogs

[shobhitagarwal1612]

Fixes #3438

This PR resolves, "HomeScreenFragment.showSignOutConfirmationDialogs creates new mutable states and composables on every click, bypassing recomposition entirely."

Verified the changes by opening the user details dialog and adding test coverage.

Screen_recording_20260227_120145.webm

@andreia-ferreira PTAL?

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[codecov]

Codecov Report

❌ Patch coverage is 93.18182% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.11%. Comparing base (e8ede9e) to head (e917538).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...oundplatform/android/ui/home/UserAccountDialogs.kt	87.50%	0 Missing and 2 partials ⚠️
...oundplatform/android/ui/home/HomeScreenFragment.kt	90.90%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3583      +/-   ##
============================================
+ Coverage     71.09%   71.11%   +0.01%     
- Complexity     1625     1629       +4     
============================================
  Files           337      338       +1     
  Lines          9096     9114      +18     
  Branches       1001     1003       +2     
============================================
+ Hits           6467     6481      +14     
- Misses         2030     2031       +1     
- Partials        599      602       +3     

Files with missing lines	Coverage Δ
...undplatform/android/ui/home/HomeScreenViewModel.kt	76.78% <100.00%> (+10.11%)	⬆️
...oundplatform/android/ui/home/HomeScreenFragment.kt	72.00% <90.90%> (-4.53%)	⬇️
...oundplatform/android/ui/home/UserAccountDialogs.kt	87.50% <87.50%> (ø)

... and 1 file with indirect coverage changes

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