fix: enhance mention documents

[AnishSarkar22]

Description

• Unified mentioned documents and sidebar document handling (when using checkboxes).
• Improved user message rendering with mention chips for referenced documents.
• Added syncEditorState function to manage editor state and mentioned documents.

Motivation and Context

FIX #

Screenshots

API Changes

• This PR includes API changes

Change Type

• Bug fix
• New feature
• Performance improvement
• Refactoring
• Documentation
• Dependency/Build system
• Breaking change
• Other (specify):

Testing Performed

• Tested locally
• Manual/QA verification

Checklist

• Follows project coding standards and conventions
• Documentation updated as needed
• Dependencies updated as needed
• No lint/build errors or new warnings
• All relevant tests are passing

High-level PR Summary

This PR unifies document mention handling by consolidating the sidebarSelectedDocumentsAtom and mentionedDocumentsAtom into a single source of truth. The sidebar checkbox selection now updates the same atom as the inline @mention editor, eliminating duplicate state tracking. The editor has been enhanced with selection persistence to handle chip insertion when focus shifts (e.g., clicking a sidebar checkbox), and user messages now render inline mention chips instead of displaying them as separate badges. A new syncEditorState function ensures the editor state and mentioned documents stay synchronized throughout the user interaction lifecycle.

⏱️ Estimated Review Time: 30-90 minutes

💡 Review Order Suggestion

Order	File Path
1	surfsense_web/atoms/chat/mentioned-documents.atom.ts
2	surfsense_web/components/assistant-ui/inline-mention-editor.tsx
3	surfsense_web/components/assistant-ui/thread.tsx
4	surfsense_web/components/assistant-ui/user-message.tsx
5	surfsense_web/components/layout/ui/sidebar/DocumentsSidebar.tsx
6	surfsense_web/app/dashboard/[search_space_id]/new-chat/[[...chat_id]]/page.tsx

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