Frontend audit: Bug fixes and refinements

[ManishMadan2882]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  Bug Fixes & UI Improvements
• Separated attachment ID for Redux operations to prevent state conflicts between UI removal and backend task tracking
• Fixed popup components (Sources, Tools) and toast notifications to use proper z-index and positioning
• Updated ShareConversationModal to use consistent button styling and layout
• Renamed components for consistency: ConnectorTreeComponent → ConnectorTree, FileTreeComponent → FileTree
• Removed unused CreateAPIKeyModal and SaveAPIKeyModal files and related models

Features & Enhancements

• Implemented auto-clear functionality for invalid sources from localStorage on preference slice initialization

• Enhanced preferenceApi with validation logic to detect and remove stale source references

• Fixed "Delete All Conversations" modal close button behavior for better UX

• Implemented "play one at a time" functionality for TTS to prevent multiple audio streams playing simultaneously

• implemented LRU cache for the audio

• Added key to the ConversationMesages and ConversationBubble to trigger an implicit remount(this fixes a bug, where the playing state of one message was displayed on another conversation after switching)

• Cleaning the Text message for TTS (cleans markdown symbols and emojis, skips code blocks and mermaid flowcharts)

• Why was this change needed? (You can also link to an open issue here)
  Enhancement, UX, Quality

[vercel]

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[codecov]

Codecov Report

❌ Patch coverage is 3.44828% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 42.70%. Comparing base (9b2383b) to head (7b0d4fe).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
application/utils.py	3.84%	25 Missing ⚠️
application/api/user/attachments/routes.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2112      +/-   ##
==========================================
+ Coverage   42.28%   42.70%   +0.41%     
==========================================
  Files         136      137       +1     
  Lines        9315     9458     +143     
==========================================
+ Hits         3939     4039     +100     
- Misses       5376     5419      +43     

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