Add date attribute support across processing and attribute visualizations

[Copilot]

Multinet date attributes were being dropped or rendered as blank attribute columns. This updates the data path so supported date values are preserved as native Date objects and displayed on usable date-aware scales in UpSet.

• Core date handling

  • retain date columns as dataset attributes
  • parse supported inputs into native Date objects during processing
  • include date attributes in summary statistics by converting them to timestamps when computing numeric summaries
  • allow Vega range filters to operate on date-backed attributes

• Supported date formats

  • native Date
  • year-only values (1999)
  • ISO-like dates/timestamps (2024-01-02, 2024-05-20T13:30:00Z)
  • textual dates that JS can parse reliably
  • ambiguous numeric formats such as 03/04/2024 remain unparsed by design

• Attribute rendering

  • use timestamp values for attribute plots and alignment so existing numeric plot components continue to work
  • format attribute header ticks and summary tooltips with date-aware labels
  • adapt formatting to the visible range (year-only vs calendar date vs date-time)

• Element view / Vega compatibility

  • convert Date values to numeric timestamps before passing item attributes into Vega-backed plots and preview data
  • keep brushing/filtering behavior consistent for date attributes without changing plot configuration shape

• Coverage

  • add mocked date-attribute fixtures and focused Playwright coverage for rendered date scales
  • add regression coverage to ensure ambiguous slash-formatted dates are not auto-parsed

const annotations = {
  Name: 'label',
  'Group A': 'boolean',
  ReleaseDate: 'date',
  Premiere: 'date',
};

const rows = [
  { Name: 'Alpha', 'Group A': true, ReleaseDate: '1999', Premiere: '2024-01-02' },
  { Name: 'Beta', 'Group A': false, ReleaseDate: '2001', Premiere: '2024-05-20T13:30:00Z' },
];

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