[praxagent]

Comment on a passage of a note, and ask Prax with @prax. Prax side: praxagent/prax#272 (stacked on prax #270). Rebased onto main after #90 merged; merges cleanly with #91 in either order (checked locally).

What changes

Comments in the note view (Space page and Library panel).

• Select text and a Comment button appears beside it. The composer shows the passage; Ctrl/Cmd+Enter sends.
• The threads sit under the note, with reply, resolve or reopen, and delete. There is also a comment on the whole note, and resolved threads are hidden until you ask for them.
• Commented passages are highlighted with the CSS Custom Highlight API, which marks ranges without touching the rendered markdown. Where a browser lacks it, everything works without highlights.
• A thread whose passage was edited away says so.

@prax. "Prax is replying…" shows until his answer arrives, by the existing library-changed nudge or, as a fallback, by polling every 4 s while he works. Comments are relayed to Prax, which stores them in the note.

MarkdownContent memoises its react-markdown components.

• It used to build a new object on every render, which gave react-markdown new component types each time.
• So any parent re-render rebuilt the whole rendered DOM. That dropped a selection in progress and the highlight ranges (found end to end: the highlight vanished after the first re-render), and re-mounted every chat message for nothing.
• A new test fails on the old code.

Verification

• NoteComments.test.tsx (9): matching a passage across paragraphs and by prefix, threads, Prax replying, a missing passage, reply and resolve, and a whole-note comment.
• MarkdownContent.rerender.test.tsx.
• tests/test_library_comments.py: the relay.
• make ci green (522 after the rebase), all 145 frontend tests pass, and lint has no new warnings.
• End to end in headless Chromium against a stand-in Prax:
  • a real mouse drag to select, then Comment, typing and Ctrl+Enter;
  • "Prax is replying…", then the reply arriving;
  • the highlight surviving re-renders, and resolving clears it.

🤖 Generated with Claude Code

https://claude.ai/code/session_01NzJXnMXFAX7Km7aDmRc6zX