refactor: migrate conversation search folder 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 conversation search and folder ViewModels from Hilt call-site creation to Metro-backed factories.
• Covers message/user/app search, folder management, and move-to-folder wiring.
• Keeps existing screen contracts and assisted arguments behavior unchanged.

[codecov]

Codecov Report

❌ Patch coverage is 9.45946% with 67 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.93%. Comparing base (4c06c32) to head (6198c23).

Files with missing lines	Patch %	Lines
...ations/ConversationSearchFolderViewModelFactory.kt	0.00%	63 Missing ⚠️
...home/conversations/folder/ConversationFoldersVM.kt	0.00%	2 Missing ⚠️
...conversations/folder/MoveConversationToFolderVM.kt	0.00%	2 Missing ⚠️

❌ Your patch check has failed because the patch coverage (9.45%) 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    #4895      +/-   ##
===========================================
- Coverage    50.07%   49.93%   -0.15%     
===========================================
  Files          628      629       +1     
  Lines        22334    22397      +63     
  Branches      3427     3427              
===========================================
  Hits         11183    11183              
- Misses       10114    10177      +63     
  Partials      1037     1037              

Files with missing lines	Coverage Δ
...ui/home/conversations/folder/NewFolderViewModel.kt	100.00% <100.00%> (ø)
...onversations/promoteadmin/PromoteAdminViewModel.kt	94.91% <100.00%> (ø)
...i/home/conversations/search/SearchUserViewModel.kt	97.26% <100.00%> (ø)
...oconversation/AddMembersToConversationViewModel.kt	95.00% <100.00%> (ø)
...e/conversations/search/apps/SearchAppsViewModel.kt	98.07% <100.00%> (ø)
...ch/messages/SearchConversationMessagesViewModel.kt	100.00% <100.00%> (ø)
...home/conversations/folder/ConversationFoldersVM.kt	0.00% <0.00%> (ø)
...conversations/folder/MoveConversationToFolderVM.kt	0.00% <0.00%> (ø)
...ations/ConversationSearchFolderViewModelFactory.kt	0.00% <0.00%> (ø)

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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