🔍 feat: Enhance Conversation Search to Include Message Content

[devilb2103]

Summary

Added global search functionality that searches through both conversation titles and message content.

Instead of modifying the existing getConvosByCursor function, a new dedicated searchConversations method was created to maintain separation of concerns:

• getConvosByCursor → Lightweight conversation listing (unchanged, title-only search)
• searchConversations → Global search across titles + message content

Changes:

• Added searchConversations() method in api/models/Conversation.js that queries both Conversation and Message MeiliSearch indexes in parallel
• Updated api/server/routes/convos.js to use searchConversations when search param is provided, otherwise falls back to getConvosByCursor

Change Type

• New feature (non-breaking change which adds functionality)

Testing

1. Ensure MeiliSearch is configured and running
2. Create conversations with various titles and message content
3. Test regular listing (no search) → should work as before
4. Test search functionality:
   • Terms in conversation titles → should return matches
   • Terms in message content → should now return matches
   • Terms in both → should return deduplicated results
5. Test with archived conversations (isArchived=true)

Test Configuration:

• MeiliSearch enabled with SEARCH=true
• Existing indexed conversations and messages

Checklist

• My code adheres to this project's style guidelines
• I have performed a self-review of my own code
• I have commented in any complex areas of my code
• My changes do not introduce new warnings
• Local unit tests pass with my changes