Adds accessible, touch-sized checklist controls to writable online issue detail. Each toggle updates only the selected Markdown marker through the existing optimistic-concurrency content endpoint; pending, success, conflict, network, offline, and read-only states fail safely.
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Closes #905
Adds accessible, touch-sized checklist controls to writable online issue detail. Each toggle updates only the selected Markdown marker through the existing optimistic-concurrency content endpoint; pending, success, conflict, network, offline, and read-only states fail safely.
Tests:
pytest -q(1735 passed, 1 skipped); Chromium 390x844 rendered validation (44x44 target, no horizontal overflow).