refactor: persistence snapshot reads and mention filtering [WPB-8645]

[MohamadJaara]

https://wearezeta.atlassian.net/browse/WPB-8645

Why

Kalium-owned per-key FlowCache can make correctness-sensitive reads depend on replayed observation state. This PR removes that shared cache layer from persistence and adds narrow snapshot reads for fresh database decisions.

It also exposes member mention filtering so app-side callers can reuse an already observed member list without collecting the members flow again.

What changed

• Removed FlowCache and its database-builder wiring.
• Added narrow DAO snapshot APIs for team lookup, conversation last-read date, member admin checks, member count aggregates, and direct member reads.
• Updated correctness-sensitive repository/use-case paths to use snapshot reads instead of .first() on observed flows.
• Extracted MembersToMentionUseCase.filterConversationMembers(...) for app-side member snapshot reuse.
• Added/updated DAO and use-case regression coverage for fresh snapshot reads.

[github-actions]

Test Results

0 tests   - 5 737   0 ✅  - 5 594   0s ⏱️ - 4m 20s
0 suites  -   878   0 💤  -   143 
0 files    -   878   0 ❌ ±    0 

Results for commit 900781e. ± Comparison against base commit 2ca7e8e.

♻️ This comment has been updated with latest results.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 97.22222% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 61.59%. Comparing base (2f37b63) to head (03514a2).

Files with missing lines	Patch %	Lines
...lin/com/wire/kalium/persistence/dao/UserDAOImpl.kt	85.71%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #4177      +/-   ##
=============================================
- Coverage      61.60%   61.59%   -0.01%     
- Complexity      4033     4040       +7     
=============================================
  Files           2076     2077       +1     
  Lines          67813    67838      +25     
  Branches        6703     6703              
=============================================
+ Hits           41775    41788      +13     
- Misses         23369    23380      +11     
- Partials        2669     2670       +1     

Files with missing lines	Coverage Δ
...com/wire/kalium/persistence/dao/MetadataDAOImpl.kt	84.84% <100.00%> (ø)
.../kotlin/com/wire/kalium/persistence/dao/UserDAO.kt	97.24% <ø> (ø)
...um/persistence/dao/conversation/ConversationDAO.kt	85.71% <ø> (ø)
...ersistence/dao/conversation/ConversationDAOImpl.kt	80.80% <100.00%> (ø)
...om/wire/kalium/persistence/dao/member/MemberDAO.kt	77.98% <100.00%> (+7.14%)	⬆️
.../wire/kalium/persistence/db/UserDatabaseBuilder.kt	78.68% <100.00%> (-1.00%)	⬇️
...lin/com/wire/kalium/persistence/dao/UserDAOImpl.kt	58.36% <85.71%> (-0.36%)	⬇️

... and 5 files with indirect coverage changes

---

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[github-actions]

Bencher Report

Branch	mo/refactor/persistence-snapshot-reads
Testbed	ubuntu-latest

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Benchmark	Latency	microseconds (µs)
com.wire.kalium.benchmarks.logic.CoreLogicBenchmark.createObjectInFiles	📈 view plot ⚠️ NO THRESHOLD	885.71 µs
com.wire.kalium.benchmarks.logic.CoreLogicBenchmark.createObjectInMemory	📈 view plot ⚠️ NO THRESHOLD	349,378.99 µs
com.wire.kalium.benchmarks.persistence.MessageReadBenchmark.inboxPagingDeepPageBenchmark	📈 view plot ⚠️ NO THRESHOLD	127,755.91 µs
com.wire.kalium.benchmarks.persistence.MessageReadBenchmark.inboxPagingFirstPageBenchmark	📈 view plot ⚠️ NO THRESHOLD	121,821.49 µs
com.wire.kalium.benchmarks.persistence.MessageReadBenchmark.localMarkAsReadBenchmark	📈 view plot ⚠️ NO THRESHOLD	3,273.46 µs
com.wire.kalium.benchmarks.persistence.MessageReadBenchmark.messagePagingDeepPageBenchmark	📈 view plot ⚠️ NO THRESHOLD	27,081.33 µs
com.wire.kalium.benchmarks.persistence.MessageReadBenchmark.messagePagingFirstPageBenchmark	📈 view plot ⚠️ NO THRESHOLD	11,222.24 µs
com.wire.kalium.benchmarks.persistence.MessagesNoPragmaTuneBenchmark.messageInsertionBenchmark	📈 view plot ⚠️ NO THRESHOLD	1,218,356.84 µs
com.wire.kalium.benchmarks.persistence.MessagesNoPragmaTuneBenchmark.queryMessagesBenchmark	📈 view plot ⚠️ NO THRESHOLD	20,744.22 µs

🐰 View full continuous benchmarking report in Bencher

[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