Browser-based component spec mirroring PersonTypeahead.svelte.spec.ts:
renders empty input, surfaces pre-selected chips with formatted date,
emits hidden documentIds inputs for each chip, debounces the search
against /api/documents/search, adds a chip on click, hides already-
selected docs from new dropdown results, and removes a chip on × click.
Closes Felix's review B2 on PR #382.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
