refactor: migrate scoped message view models to metro [WPB-25946]

[Garzas]

https://wearezeta.atlassian.net/browse/WPB-25946

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PR Submission Checklist for internal contributors

• The PR Title

  • conforms to the style of semantic commits messages¹ supported in Wire's Github Workflow²
  • contains a reference JIRA issue number like SQPIT-764
  • answers the question: If merged, this PR will: ... ³

• The PR Description

  • is free of optional paragraphs and you have filled the relevant parts to the best of your ability

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What's new in this PR?

• Migrates scoped message and composer ViewModels from Hilt assisted factories to Metro-backed Resaca creation.
• Adds ScopedMessageViewModelFactory and graph accessors while preserving scoped lifecycle behavior.
• Keeps preview/Espresso fallback behavior in the shared scoped ViewModel helper.

[codecov]

Codecov Report

❌ Patch coverage is 11.94030% with 59 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.26%. Comparing base (4227187) to head (12efeb8).

Files with missing lines	Patch %	Lines
...ome/conversations/ScopedMessageViewModelFactory.kt	0.00%	57 Missing ⚠️
.../conversations/edit/MessageOptionsMenuViewModel.kt	0.00%	2 Missing ⚠️

❌ Your patch check has failed because the patch coverage (11.94%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4896      +/-   ##
===========================================
- Coverage    50.40%   50.26%   -0.14%     
===========================================
  Files          626      627       +1     
  Lines        22192    22246      +54     
  Branches      3427     3427              
===========================================
- Hits         11186    11183       -3     
- Misses        9969    10026      +57     
  Partials      1037     1037              

Files with missing lines	Coverage Δ
...ndroid/media/audiomessage/AudioMessageViewModel.kt	81.13% <100.00%> (ø)
...ui/home/conversations/CompositeMessageViewModel.kt	85.71% <100.00%> (-0.96%)	⬇️
...nversations/edit/MessageOptionsModalSheetLayout.kt	0.00% <ø> (ø)
...id/ui/home/conversations/messages/QuotedMessage.kt	0.00% <ø> (ø)
...ersations/messages/item/AssetLocalPathViewModel.kt	70.83% <100.00%> (ø)
...ndroid/ui/home/conversations/model/MessageTypes.kt	14.28% <ø> (ø)
...tions/model/messagetypes/audio/AudioMessageType.kt	0.00% <ø> (ø)
...e/conversations/typing/TypingIndicatorViewModel.kt	80.00% <100.00%> (-1.25%)	⬇️
...oser/actions/SelfDeletingMessageActionViewModel.kt	86.66% <ø> (-0.84%)	⬇️
...poser/attachments/IsFileSharingEnabledViewModel.kt	92.30% <100.00%> (ø)
... and 3 more

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud