fix: show add LOI button when zoomed out

[arpitagarwal1301]

Fixes #3553

• Keep the Add LOI FAB available regardless of map zoom level.
• Preserve zoom-dependent LOI viewport filtering and map clustering behavior.
• Add focused coverage for the below-clustering-threshold case.

Verification

• ./gradlew checkCode
• ./gradlew :app:ktfmtCheck :app:testLocalDebugUnitTest --tests 'org.groundplatform.android.ui.home.mapcontainer.HomeScreenMapContainerViewModelTest'
• git diff --check

Limitations

• The behavior was not visually exercised on a device; the affected ViewModel state is covered by Robolectric.

[andreia-ferreira]

optional: can be slightly simplified with

Suggested change

	if (survey == null) listOf()
	else survey.jobs.filter { it.canDataCollectorsAddLois && it.getAddLoiTask() != null }
	survey?.jobs?.filter { it.canDataCollectorsAddLois && it.getAddLoiTask() != null } ?: listOf()

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.58%. Comparing base (4b17121) to head (231fb08).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3858      +/-   ##
============================================
+ Coverage     67.49%   67.58%   +0.08%     
- Complexity     1850     1853       +3     
============================================
  Files           410      410              
  Lines         10818    10818              
  Branches       1428     1425       -3     
============================================
+ Hits           7302     7311       +9     
  Misses         2768     2768              
+ Partials        748      739       -9     

Files with missing lines	Coverage Δ
...me/mapcontainer/HomeScreenMapContainerViewModel.kt	71.79% <100.00%> (+1.92%)	⬆️

... and 3 files with indirect coverage changes

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