Fix draw area issue

[andreia-ferreira]

Fixes #3400

Currently, when rotating the draw area task screen after the polygon was finished, the drawn polygon would be lost. This could also lead to a crash java.lang.IllegalStateException - Attempted to add last vertex after completing the drawing if the 'Add point' would show again during this issue and the user clicked it.

This was because the state was split between draftArea which held only the first vertex and draftUpdates, a no-replay SharedFlow. Since draftUpdates doesn't replay, the current feature was lost so the shape vanished and buttons reverted

Now draftArea carries the full geometry and buttons derive from sessionState, so both survive rotation. FeatureManager.setFeatures was updated so that a non-clustered feature whose tag already exists is updated instead of removed and re-added, which avoids potential flickering.

Before:

Screen_recording_20260630_162746.webm

After:

Screen_recording_20260630_160754.webm

@shobhitagarwal1612 PTAL?

[codecov]

Codecov Report

❌ Patch coverage is 71.42857% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.50%. Comparing base (345b674) to head (43d008f).

Files with missing lines	Patch %	Lines
...form/android/ui/map/gms/features/FeatureManager.kt	0.00%	9 Missing ⚠️
...acollection/tasks/polygon/DrawAreaTaskViewModel.kt	78.57%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3804      +/-   ##
============================================
+ Coverage     67.27%   67.50%   +0.22%     
- Complexity     1790     1798       +8     
============================================
  Files           405      405              
  Lines         10617    10625       +8     
  Branches       1353     1356       +3     
============================================
+ Hits           7143     7172      +29     
+ Misses         2781     2755      -26     
- Partials        693      698       +5     

Files with missing lines	Coverage Δ
...ollection/tasks/polygon/DrawAreaTaskMapFragment.kt	47.82% <ø> (-2.18%)	⬇️
...acollection/tasks/polygon/PolygonDrawingSession.kt	100.00% <100.00%> (ø)
...lection/tasks/polygon/PolygonDrawingSessionImpl.kt	94.23% <100.00%> (+0.48%)	⬆️
...dplatform/android/ui/map/gms/GoogleMapsFragment.kt	18.10% <ø> (+0.15%)	⬆️
...orm/android/ui/map/gms/features/MapsItemManager.kt	48.88% <100.00%> (+48.88%)	⬆️
...acollection/tasks/polygon/DrawAreaTaskViewModel.kt	81.37% <78.57%> (-0.94%)	⬇️
...form/android/ui/map/gms/features/FeatureManager.kt	18.96% <0.00%> (ø)

... and 3 files with indirect coverage changes

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