Searching subprocessors flipped the list between filtered and unfiltered
results in an infinite loop: useSubprocessorFilters kept a local search
mirror plus a write-back effect, so every component calling it (page,
loader, toolbar, empty state) ran its own effect while only the toolbar
updated the mirror — the stale instances fought the real writer.
Make useSubprocessorFilters a pure URL-state hook and move the debounced
search input into a single-owner useSubprocessorSearch hook mounted only
by the toolbar, guarding the URL-to-input sync with a ref so its own
commits are not echoed back.
Refetch on filter change now runs inside a transition so the toolbar and
current results stay mounted instead of falling back to the whole-page
Suspense skeleton; only the results container dims while loading.
Signed-off-by: Émile Ré <emile@probo.com>
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