[timdegroot1996]

Closes #375

Adds opt-in notes on test results: write down why a test failed or passed with a warning, link the bug, and group notes with categories you define. Documentation: docs/notes.md.

How it works

• Opt-in. Settings → Defaults → Test Notes (off by default). Turning it off hides everything; stored notes come back when it is turned on again.
• Storage. Notes live in the browser's localStorage, keyed by run and test, so they work in a local HTML file and with --server. Nothing is written to the database or the HTML. Export/import is available in the Notes modal.
• Adding a note.
  • Right-click a test in Test Statistics, the Most Failed / Most Flaky graphs (and recent variants) or Compare Tests. A normal click still opens the log.
  • The pencil in the new Test Notes widget, or in the note column of the Test table.
• Editor. Text (max 2000 chars, http(s) links clickable), an optional category, Delete Note / Save Note in the header. There is no Close: dismissing the editor saves.
• Categories. User defined name and color, managed in the editor or in the Notes modal.
• Notes modal. Notes tab with an Update mode that shows the checkboxes and the bulk delete buttons, Unmatched tab for notes whose run/test is not in this dashboard, Categories tab. Edits are stored immediately, and the dashboard redraws after the modal closes, like the filter and settings modals.
• Where notes show. Tooltips, a category colored border around tests with a note, the Test Notes widget (failures, failures without a note, notes per category) and the Tables page. The widget follows the section filters and can be moved or hidden in the layout editor.

Also changed

• Modals no longer shift the page or shorten the sticky menu bar (body.modal-open no longer becomes a scroll container).
• Closing the Settings modal keeps the scroll position instead of jumping to the top.
• Redrawing the test graphs after a note change shows the loading spinners.

Testing

• JS 480 passed (new tests/javascript/notes), Python 414 passed with 97% coverage.
• Robot (Docker): full suite 142/142, including the new 10_notes.robot.

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