Channel narrows the Kind options to the chosen channel, so filtering by more
than one channel at a time is incoherent. Replace the Channel multi-select
dropdown with a native single-select (matching the Time range control); Kind,
Status and Site stay multi-select. The query filter contract is unchanged —
Channels just carries 0 or 1 value.
Replace the four stacked chip-button groups (Channel, Kind, Status, Site) on
the Audit Log filter bar with a reusable MultiSelectDropdown component, so the
bar collapses from four full-width chip blocks to four inline dropdowns sharing
one wrapped filter row. Bootstrap dropdown + checkbox menu (data-bs-auto-close
=outside); no third-party UI libraries.
