[QA] ✅ VERIFIED - All 19 E2E tests pass. Ticket references successfully updated from TRCKR-659 to TRCKR-547 (20 occurrences). No regressions detected. Full QA report: /tmp/qa-TRCKR-547.md

## Work Completed The E2E tests for creating documents with the Milkdown editor already existed in `tests/e2e/test_document_create_milkdown.py`. The test file contained 19 comprehensive tests covering: 1. **Editor Initialization** - Milkdown/ProseMirror contenteditable setup 2. **Basic Creation** - Title-only document, simple text body 3. **Markdown Features** - Headings, bold/italic, bullet lists, numbered lists, code blocks, blockquotes 4. **Special Content** - Special characters, unicode/emojis, multiple paragraphs, mixed formatting 5. **Edge Cases** - Cancel discards, close button discards, empty title validation, long titles, whitespace body 6. **Sequential Creation** - Multiple documents in sequence ### Changes Made Updated ticket references from TRCKR-659 to TRCKR-547 in all docstrings (20 occurrences). ### Test Results All 19 tests pass (47.21s) ### Files Changed - `tests/e2e/test_document_create_milkdown.py:1-706` - Updated all TRCKR-659 references to TRCKR-547