Adds table.search, table.filters (auto-register active-filter chips +
Clear-all + overflow popover / overflow=card), table.trashed,
table.actions, and a pagination/sort loading overlay. Introduces atom's
first test suite (Pest + Testbench + Playwright against testbench serve).
Also fixes a latent dropdown-positioning bug (FloatingUI strategy:fixed
for top-layer native popovers) — dist rebuilt.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>