Closes#90.
Code blocks and inline code inherited the typography plugin's defaults,
which shrank them to ~86% of an already-monospace body and painted them
--bg-surface — the same colour as the default note card — so a snippet
was only recognisable by being smaller. Long lines also grew a horizontal
scrollbar inside card previews.
- New --code-bg surface (one step below the page in light mode, page-level
ink in dark) with a subtle border, and code keeps the surrounding text
size. Decorative backtick pseudo-elements dropped now that the chip
carries the signal.
- Card previews clip wide code instead of scrolling; editor and share page
keep horizontal scroll.
- Syntax highlighting via one shared lowlight instance feeding both the
TipTap editor (extension-code-block-lowlight) and the markdown-it
renderer, so a fence looks identical in the editor, on cards and on the
share page. Only highlight.js "common" grammars are bundled.
- No auto-detection: highlight.js misreads note-sized snippets too often
(JavaScript as CSS, SQL as VB.NET). Unlabelled fences stay plain; the
language comes from the fence info string or a toolbar picker shown
while the cursor is in a code block.
- Six --hl-* token colours per theme; a unit test parses app.css and
asserts AA contrast against --code-bg and mutual distinguishability.
- Sanitizer now allows only language-* / hljs-* classes on code and span.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014u5WimmZvshm9RJSd1c6wx
