typst: stop heading title at // or /* comment markers

headingTitleTokenizer now stops reading when it encounters '//' or '/*',
so '= Heading // note' correctly produces a HeadingTitle token for 'Heading'
and a LineComment for the rest of the line.  Without this, the comment was
consumed into HeadingTitle, getting heading highlight and appearing verbatim
in the file outline.

Also strip trailing line comments from heading titles in the regex-based
document outline scanner, which reads raw text independently of the tree.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

services/web/frontend/js/features/source-editor/languages/typst/document-outline.ts

@@ -35,8 +35,11 @@ function computeOutline(
 
     const depth = match[1].length
     const level = LEVELS[Math.min(depth, LEVELS.length) - 1]
-    // Strip a trailing label, e.g. '= Introduction <intro>'.
-    const title = match[2].replace(/\s*<[\w-]+>\s*$/, '').trim()
+    // Strip a trailing line comment, then a trailing label.
+    const title = match[2]
+      .replace(/\s*\/\/.*$/, '')
+      .replace(/\s*<[\w-]+>\s*$/, '')
+      .trim()
 
     items.push({
       line: n,

services/web/frontend/js/features/source-editor/lezer-typst/tokens.mjs

@@ -60,6 +60,10 @@ export const headingTitleTokenizer = new ExternalTokenizer(
   (input, _stack) => {
     let hasContent = false
     while (input.next !== -1 && input.next !== NEWLINE) {
+      // Stop before a line comment (//) or block comment (/*) so that
+      // '= Heading // note' leaves the comment for the LineComment rule.
+      if (input.next === SLASH &&
+          (input.peek(1) === SLASH || input.peek(1) === STAR)) break
       input.advance()
       hasContent = true
     }