trim_end_matches('\n') stripped all trailing newlines from the code
block buffer before highlighting, discarding intentional blank lines
authored inside fences. pulldown-cmark appends exactly one trailing
'\n' to the text content, and LinesWithEndings handles it correctly
as a line terminator, so no trimming is needed. Remove the trim to
preserve user-authored blank lines faithfully.
Integrate syntax highlighting into diff rendering and markdown code
blocks, with proper line wrapping that preserves styled spans.
- Add detect_lang_for_path() for extension-based language detection
- Syntax-aware diff rendering for Add/Delete/Update file changes
- wrap_styled_spans() splits long highlighted lines across display rows
- Buffer fenced code blocks in markdown_render for batch highlighting
- Add snapshot tests for highlighted diff wrapping
- Replace code_block_unhighlighted test with 3 syntax color assertions
Codex identified this as the cause of a reported hang:
https://github.com/openai/codex/issues/7822. Apparently, the wrapping
algorithm we're using has known issues and bad worst-case behaviors when
OptimalFit is used on certain strings. It recommended switching to
FirstFit instead.
We don't instruct the model to use citations, so it never emits them.
Further, ratatui [doesn't currently support rendering links into the
terminal with OSC 8](https://github.com/ratatui/ratatui/issues/1028), so
even if we did parse citations, we can't correctly render them.
So, remove all the code related to rendering them.
Also, simplify the streaming behavior.
This fixes a number of display issues with streaming markdown, and paves
the way for better markdown features (e.g. customizable styles, syntax
highlighting, markdown-aware wrapping).
Not currently supported:
- footnotes
- tables
- reference-style links
