The backend rejects `level`/`event` as x:Log/query filter conditions
(unsupportedFilter), even though both are already returned per row.
Since a real fix requires backend changes outside this repo, the two
filters are injected into the schema client-side (clientOnly flag) and
applied entirely in the browser: excluded from the JMAP filter sent to
the server, and used to narrow an eagerly-fetched, locally-paginated
result set instead.
Also makes large enum filters (Event has 634 values) render as a
searchable Combobox instead of a plain Select, generically for any
list with more than 15 enum options.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
