swarm-ui: persist table filters, add reset button, multi-select, negate

Per mara's issue: tables should remember their filters (with a reset
button), the labels filter should be multi-select, and any filter should
support negation (search vs exclude).

All in the shared Table component (ui/table/Table.tsx), used by
AgentsPage/HivesPage/IssueReportPage:

- filters now persist via the same useLocalSetting hook IssueReportPage
  already used for its own state, keyed by a new required storageKey
  prop (required, not optional, so no caller can forget it and every
  table gets persistence for free)
- a small 'reset filters' button clears every column's filter at once,
  shown only when at least one is active
- new filterMode: "multiselect" (+ a filterValues extractor, alongside
  the existing single-value filterValue) renders a checkbox list and
  matches on any overlap - IssueReportPage's own bespoke label-checkbox
  sidebar is folded into this instead of staying a second, separate
  filter mechanism
- a negate toggle ('exclude') sits under every filter mode's control,
  applying uniformly to text/select/multiselect

Verified: tsc --noEmit and the esbuild bundle both clean.

frontend/packages/swarm-ui/src/pages/ComponentsPage.tsx

@@ -223,10 +223,16 @@ export function ComponentsPage() {
             columns={TABLE_COLUMNS}
             rows={TABLE_ROWS}
             rowKey={(r) => r.name}
+            storageKey="swarm-ui:components-demo:table-filters"
           />
         </Sample>
         <Sample label="empty">
-          <Table columns={TABLE_COLUMNS} rows={[]} rowKey={(r) => r.name} />
+          <Table
+            columns={TABLE_COLUMNS}
+            rows={[]}
+            rowKey={(r) => r.name}
+            storageKey="swarm-ui:components-demo:table-filters-empty"
+          />
         </Sample>
       </Section>