v2.7.3: Fix URL parsing for bracket-wrapped URLs

Bug Fixes

URL Parsing Improvements

• Fixed issue where URLs wrapped in square brackets [https://example.com] were not being converted to clickable markdown links
• Resolved double-processing bug that caused malformed markdown rendering
• URLs like [https://forms.gle/oSTsvh6cDkjECL2VA] now correctly render as clickable links

Technical Details

• Implemented two-pass URL processing approach:
  • First pass: converts [URL] to [URL](URL)
  • Second pass: converts bare URLs while avoiding already-processed markdown
• Fixed regex pattern to prevent URL truncation at closing brackets

This fix ensures LLM responses with bracket-wrapped URLs render correctly in the chatbot interface.