fix(headings): match ATX headings on CRLF lines (fixes empty TOC on Windows files)

Context:
HEADING_RE (wikilink/navigation.logic.ts) is the shared ATX-heading matcher used
by the Table of Contents (toc.logic.extractTocHeadings), wikilink navigation
(findHeadingPosition), wikilink completion, and copy-block-link. These callers
split raw file content on '\n', so a CRLF-authored file leaves a trailing '\r'
on each line.

Problem:
HEADING_RE was /^#{1,6}\s+(.+)$/. In JS regex `.` does not match '\r', and `$`
(no multiline) only matches end-of-string or before a final '\n' -- not before a
'\r'. So `# Heading\r` never matched. For any markdown file with CRLF line
endings the TOC was completely empty ("No headings found"), and wikilink jumps to
`#heading` returned null. The breakage only affected unedited files: once the
user made any edit, CodeMirror rewrote the buffer to LF and headings reappeared.

Solution:
Add an optional trailing carriage return to the capture's terminator:
/^#{1,6}\s+(.+)\r?$/. The greedy `(.+)` still stops before '\r' (so the capture
is unchanged for LF input), `\r?` consumes the optional carriage return, then `$`
matches end-of-line. Callers split on '\n' and compute positions as
`line.length + 1`; since '\r' stays inside line.length, byte offsets remain
correct for CRLF.

Behavior:
- CRLF files: TOC populates, wikilink/heading navigation and completion resolve.
- LF files: capture group and positions byte-identical to before.

Files:
- src/lib/core/markdown-editor/extensions/wikilink/navigation.logic.ts:1-7 —
  HEADING_RE tolerates trailing '\r'; expanded doc comment.
- src/tests/.../wikilink/navigation.logic.test.ts — findHeadingPosition over CRLF
  content (positions 0 and 28).
- src/tests/lib/plugins/table-of-contents/toc.logic.test.ts — extractTocHeadings
  over CRLF content (levels, text, line, pos).
- tasks/todo/bug-hunt-fixes.md — H7 marked done.

Note: separate local heading regexes in live-preview/embed-resolver.logic.ts:2
and kanban.logic.ts:3 have the same latent CRLF gap; left untouched as they are
outside this fix's scope.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: diegorv

src/lib/core/markdown-editor/extensions/wikilink/navigation.logic.ts

@@ -1,5 +1,9 @@
-/** Regex matching any ATX heading: `# Title`, `## Title`, etc. */
-export const HEADING_RE = /^#{1,6}\s+(.+)$/;
+/**
+ * Regex matching any ATX heading: `# Title`, `## Title`, etc.
+ * Tolerates a trailing carriage return so headings are still matched when
+ * callers split CRLF (Windows) content on `\n` and the line retains its `\r`.
+ */
+export const HEADING_RE = /^#{1,6}\s+(.+)\r?$/;
 
 /** Regex matching a block-id marker at the end of a line: `text ^block-id` */
 export const BLOCK_ID_RE = /\^([^\s]+)\s*$/;

src/tests/lib/core/markdown-editor/extensions/wikilink/navigation.logic.test.ts

@@ -58,6 +58,15 @@ describe('findHeadingPosition', () => {
 		const content = '# Intro\n\n## Intro\n\ntext';
 		expect(findHeadingPosition(content, 'Intro')).toBe(0);
 	});
+
+	it('finds headings in a document with CRLF line endings', () => {
+		// Windows/CRLF-authored notes leave a trailing \r on each split line;
+		// the heading regex must tolerate it. Positions are byte offsets that
+		// include the \r (split on \n keeps it in line.length).
+		const content = '# Heading One\r\n\r\nSome text\r\n## Heading Two\r\n';
+		expect(findHeadingPosition(content, 'Heading One')).toBe(0);
+		expect(findHeadingPosition(content, 'Heading Two')).toBe(28);
+	});
 });
 
 describe('findBlockIdPosition', () => {

src/tests/lib/plugins/table-of-contents/toc.logic.test.ts

@@ -38,6 +38,16 @@ describe('extractTocHeadings', () => {
 		]);
 	});
 
+	it('extracts headings from a file with CRLF (Windows) line endings', () => {
+		// Each split line keeps a trailing \r; without tolerating it the regex
+		// matches nothing and the TOC is empty for unedited Windows notes.
+		const content = '# Heading One\r\n\r\nSome text\r\n## Heading Two\r\n';
+		expect(extractTocHeadings(content)).toEqual([
+			{ level: 1, text: 'Heading One', line: 0, pos: 0 },
+			{ level: 2, text: 'Heading Two', line: 3, pos: 28 },
+		]);
+	});
+
 	it('preserves heading order with gaps between levels', () => {
 		const content = '# A\n### C';
 		const result = extractTocHeadings(content);

tasks/todo/bug-hunt-fixes.md

@@ -13,7 +13,7 @@ This batch fixes the **7 HIGH** bugs (one commit each). Medium + Low are backlog
 - [x] H4: collection filter — single-row `not` group collapses to bare positive expression, inverting filter + persisting inverted YAML. `src/lib/features/collection/toolbar/filter.logic.ts:146-148`. Fix: shortcut only when `conjunction !== 'not'`.
 - [x] H5: properties panel crashes (Svelte `each_key_duplicate`) when frontmatter has alias + canonical twin (`color` + `_color`). `src/lib/features/properties/PropertiesView.svelte:92-96,221`. Fix: `dedupeCanonicalKeys` on parse path (or key=index).
 - [x] H6: kanban drag-drop misplaces cards (DOM filtered index spliced into full array) when a filter is active -> corrupts `.kanban`. `src/lib/plugins/kanban/KanbanView.svelte:372-393`. Fix: disable drag while filtered, or map filtered->absolute index.
-- [ ] H7: Table of Contents empty for CRLF files (`\r` breaks HEADING_RE). `src/lib/plugins/table-of-contents/toc.logic.ts:63-93` (root: `wikilink/navigation.logic.ts:2`). Fix: split `/\r?\n/` or strip `\r`; also fixes wikilink `#heading` jump on CRLF docs.
+- [x] H7: Table of Contents empty for CRLF files (`\r` breaks HEADING_RE). `src/lib/plugins/table-of-contents/toc.logic.ts:63-93` (root: `wikilink/navigation.logic.ts:2`). Fix: split `/\r?\n/` or strip `\r`; also fixes wikilink `#heading` jump on CRLF docs.
 
 ## Backlog — MEDIUM (22)