fix(modal) :: give modal component an accessible name

[81reap]

Motivation

• The modal sets aria-labelledby to its title text rather than to the id of an element, so screen readers announce a dialog with no name.
• The browser test that should have caught this passes label to getByRole, which Playwright does not accept, so it matched any dialog on the page.

Description

• Give the modal title an id of {{id}}-title, and point aria-labelledby at it.
• Use name instead of label in the two getByRole calls of the modal test.
• Add a changelog entry.

Testing

• The browser suite passes 21 tests, the modal one now looking the dialog up by its accessible name.
• no console errors on card page fails for the reason described in fix(biome.js) :: fix remaining lint issues #1366, on this branch and on the unmodified base alike.
• npm test checks 36 files and reports nothing.

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GitHub cannot base a pull request on a branch that lives in a fork, so all eight target main and each one carries the commits of those above it. Review and merge them in order:

1. fix(biome.js) :: fix remaining lint issues #1366 :: fix(biome.js) :: fix remaining lint issues
2. fix(modal) :: give modal component an accessible name #1367 :: fix(modal) :: give modal component an accessible name ← this PR
3. fix(map) :: ignore map coordinates that are not a pair of numbers #1368 :: fix(map) :: ignore map coordinates that are not a pair of numbers
4. feat(chart) :: render column charts as bar charts #1369 :: feat(chart) :: render column charts as bar charts
5. fix(chart) :: align stacked series on their X values #1370 :: fix(chart) :: align stacked series on their X values
6. fix(chart) :: line series up on a category axis for every chart type #1371 :: fix(chart) :: line series up on a category axis for every chart type
7. fix(npm) :: install dependencies only once at root level #1372 :: fix(npm) :: install dependencies only once at root level
8. feat(typescript) :: typecheck browser JavaScript in CI #1373 :: feat(typescript) :: typecheck browser JavaScript in CI