feat(editor): make code snippets readable and syntax highlighted

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

This commit is contained in:

Claude

2026-09-17 21:42:35 +02:00

committed by

Fred Cabassut

parent 7bf06edd97

commit 58e5b5dd66

14 changed files with 698 additions and 6 deletions

									
										docs/FEATURES.md
									
		+1
		-1
	
												View File
												
				@@ -23,7 +23,7 @@

				- Blockquotes (`> quote`)

				- Unordered lists (`- item`)

				- Ordered lists (`1. item`)

				- Code blocks (triple backtick)

				- Code blocks (triple backtick) with syntax highlighting for 30+ languages — set the language in the fence (```ts) or from the toolbar picker while the cursor is inside the block; unlabelled blocks stay plain rather than guessing

				- Inline code (single backtick)

				- Links — insert, edit, and remove with URL input

				- Tables (insert, add/delete rows and columns)