feat: prevent adminless group [WPB-25246]

[e-maad]

WPB-25246 [Web] Admin Replacement Modal (Flow 1)

Summary

This PR introduces a safeguard for cases where the last admin of a group attempts to leave, ensuring groups are never left without an admin.

Changes Included

• Added a new LeaveGroupAdminModal

  • Shown when the final admin tries to leave a group
  • Requires the user to either:
    • promote another participant to admin, or
    • delete the group

• Added Zustand-based modal state management

  • Handles modal visibility
  • Tracks selected participant
  • Manages loading state

• Implemented AdminSearchInput

  • Searchable participant selector for admin promotion
  • Supports optional clearing of group content

• Added supporting styles and utilities

  • Modal/component styling
  • User filtering utility for search behavior

• Integrated modal into existing leave-group flow

  • Added feature flag checks
  • Added eligible participant filtering for admin promotion

• Added new i18n strings

  • Covers modal copy and related actions/messages

Result

Prevents groups from being left without an admin and improves the overall group management experience.

[codecov]

Codecov Report

❌ Patch coverage is 62.13592% with 39 lines in your changes missing coverage. Please review.
✅ Project coverage is 45.87%. Comparing base (4b93781) to head (174c795).
⚠️ Report is 56 commits behind head on dev.

Files with missing lines	Patch %	Lines
...s/Modals/LeaveGroupAdminModal/AdminSearchInput.tsx	0.00%	19 Missing ⚠️
...dals/LeaveGroupAdminModal/LeaveGroupAdminModal.tsx	75.86%	5 Missing and 2 partials ⚠️
...pt/components/Modals/LeaveGroupAdminModal/utils.ts	0.00%	6 Missing ⚠️
...s/webapp/src/script/view_model/ActionsViewModel.ts	77.27%	4 Missing and 1 partial ⚠️
...aveGroupAdminModal/useLeaveGroupAdminModalStore.ts	85.71%	1 Missing ⚠️
apps/webapp/src/script/view_model/MainViewModel.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #21364      +/-   ##
==========================================
+ Coverage   45.83%   45.87%   +0.04%     
==========================================
  Files        1698     1703       +5     
  Lines       43840    43943     +103     
  Branches     9127     9146      +19     
==========================================
+ Hits        20092    20159      +67     
- Misses      21472    21502      +30     
- Partials     2276     2282       +6     

Flag	Coverage Δ
app_webapp	44.11% <62.13%> (+0.05%)	⬆️
lib_api_client	51.74% <ø> (ø)
lib_core	58.91% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...rc/script/components/AppContainer/AppContainer.tsx	0.00% <ø> (ø)
...t/components/Modals/LeaveGroupAdminModal/styles.ts	100.00% <100.00%> (ø)
...s/api-client/src/team/feature/featureList.types.ts	100.00% <ø> (ø)
...aveGroupAdminModal/useLeaveGroupAdminModalStore.ts	85.71% <85.71%> (ø)
apps/webapp/src/script/view_model/MainViewModel.ts	0.00% <0.00%> (ø)
...s/webapp/src/script/view_model/ActionsViewModel.ts	25.56% <77.27%> (+9.33%)	⬆️
...pt/components/Modals/LeaveGroupAdminModal/utils.ts	0.00% <0.00%> (ø)
...dals/LeaveGroupAdminModal/LeaveGroupAdminModal.tsx	75.86% <75.86%> (ø)
...s/Modals/LeaveGroupAdminModal/AdminSearchInput.tsx	0.00% <0.00%> (ø)

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[github-actions]

🔗 Download Full Report Artifact

🧪 Playwright Test Summary

• ✅ Passed: 15
• ❌ Failed: 0
• ⏭ Skipped: 0
• 🔁 Flaky: 0
• 📊 Total: 15
• ⏱ Total Runtime: 130.4s (~ 2 min 10 sec)

[screendriver]

Please add tests for "last admin leaves" branches: eligible users, no eligible users, and self-exclusion case.

[e-maad]

I planned to add them in next PR as this PR is already huge.
I will add in this PR.

[screendriver]

This change introduces new branching behavior in leaveConversation plus a new modal/store flow, but I don’t see corresponding tests.

Please add tests for:

1. feature flag off -> existing leave flow unchanged
2. feature flag on + user is not last admin -> existing leave flow unchanged
3. feature flag on + user is last admin + eligible users exist -> modal opens
4. eligible users list excludes self (to avoid self-promotion no-op)
5. promote selected user -> role assignment called before leave
6. no eligible users -> “no eligible users” modal variant and no leave action shown
7. role assignment failure -> leave is not executed and loading state resets

This is a high-risk path (permissions + destructive actions), so deterministic tests are needed before merge

[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