fix(webapp): Implement recovery mechanism for epoch number mismatch between CC and local state [WPB-23452]

[thisisamir98]

WPB-23452 [Web] Implement recovery mechanism for epoch number mismatch between CC and local web state

Summary

if we read the epoch number from core crypto in case welcome is processed sooner than reset conversation will exists on core crypto but epoch number will be 0, on this scenario user will have a local unestablished MLS conversation that does exists on core crypto but with epoch number of 0. the recover for this scenario had the issue of reading the epoch number from backend (latest epoch number) hence app was trying to send MLS messages while the conversation was not established on core crypto level.

Closing #20508 with this.

[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

[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 45.36%. Comparing base (be04bfb) to head (bb8ffb1).
⚠️ Report is 7 commits behind head on dev.

Files with missing lines	Patch %	Lines
...epositories/conversation/ConversationRepository.ts	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #20515      +/-   ##
==========================================
- Coverage   45.38%   45.36%   -0.02%     
==========================================
  Files        1636     1636              
  Lines       40343    40344       +1     
  Branches     8330     8330              
==========================================
- Hits        18310    18304       -6     
- Misses      20099    20104       +5     
- Partials     1934     1936       +2     

Flag	Coverage Δ
app_webapp	43.57% <0.00%> (-0.02%)	⬇️
lib_api_client	50.17% <ø> (ø)
lib_core	58.86% <ø> (ø)

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

Files with missing lines	Coverage Δ
...epositories/conversation/ConversationRepository.ts	49.10% <0.00%> (-0.04%)	⬇️

... and 2 files with indirect coverage changes

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[github-actions]

🔗 Download Full Report Artifact

🧪 Playwright Test Summary

• ✅ Passed: 9
• ❌ Failed: 0
• ⏭ Skipped: 4
• 🔁 Flaky: 1
• 📊 Total: 14
• ⏱ Total Runtime: 136.2s (~ 2 min 16 sec)

specs/CriticalFlow/oneOnOneCall-TC-8754.spec.ts (❌ 0 failed, ⚠️ 1 flaky)

• ⚠️ 1:1 Video call with device switch and screenshare (tags: TC-8754, crit-flow-web)