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### What problem does this PR solve? This PR adds comprehensive **Right-to-Left (RTL) language support**, primarily targeting Arabic and other RTL scripts (Hebrew, Persian, Urdu, etc.). Previously, RTL content had multiple rendering issues: - Incorrect sentence splitting for Arabic punctuation in citation logic - Misaligned text in chat messages and markdown components - Improper positioning of blockquotes and “think” sections - Incorrect table alignment - Citation placement ambiguity in RTL prompts - UI layout inconsistencies when mixing LTR and RTL text This PR introduces backend and frontend improvements to properly detect, render, and style RTL content while preserving existing LTR behavior. #### Backend - Updated sentence boundary regex in `rag/nlp/search.py` to include Arabic punctuation: - `،` (comma) - `؛` (semicolon) - `؟` (question mark) - `۔` (Arabic full stop) - Ensures citation insertion works correctly in RTL sentences. - Updated citation prompt instructions to clarify citation placement rules for RTL languages. #### Frontend - Introduced a new utility: `text-direction.ts` - Detects text direction based on Unicode ranges. - Supports Arabic, Hebrew, Syriac, Thaana, and related scripts. - Provides `getDirAttribute()` for automatic `dir` assignment. - Applied dynamic `dir` attributes across: - Markdown rendering - Chat messages - Search results - Tables - Hover cards and reference popovers - Added proper RTL styling in LESS: - Text alignment adjustments - Blockquote border flipping - Section indentation correction - Table direction switching - Use of `<bdi>` for figure labels to prevent bidirectional conflicts #### DevOps / Environment - Added Windows backend launch script with retry handling. - Updated dependency metadata. - Adjusted development-only React debugging behavior. --- ### Type of change - [x] Bug Fix (non-breaking change which fixes RTL rendering and citation issues) - [x] New Feature (non-breaking change which adds RTL detection and dynamic direction handling) --------- Co-authored-by: 6ba3i <isbaaoui09@gmail.com> Co-authored-by: Ahmad Intisar <ahmadintisar@Ahmads-MacBook-M4-Pro.local> Co-authored-by: Ahmad Intisar <168020872+ahmadintisar@users.noreply.github.com> Co-authored-by: Liu An <asiro@qq.com>