feat(frontend): add text search to node select components

Typing in the Deploy To select of the inbound form and the node filter select on the inbound list now filters nodes by label, matching the showSearch convention used elsewhere (NodeFormModal, HostFormModal). With 20+ nodes, scrolling was the only way to find one.

Closes #5743

frontend/src/pages/inbounds/form/InboundFormModal.tsx

@@ -528,6 +528,7 @@ export default function InboundFormModal({
       {selectableNodes.length > 0 && isNodeEligible && (
         <Form.Item name="nodeId" label={t('pages.inbounds.deployTo')}>
           <Select
+            showSearch
             disabled={mode === 'edit'}
             placeholder={t('pages.inbounds.localPanel')}
             allowClear

frontend/src/pages/inbounds/list/InboundList.tsx

@@ -174,6 +174,7 @@ export default function InboundList({
               value={nodeFilter}
               onChange={(v) => setNodeFilter(v)}
               options={nodeFilterOptions}
+              showSearch
               popupMatchSelectWidth={false}
               style={{ minWidth: isMobile ? 90 : 140 }}
               aria-label={t('pages.clients.filters.nodes')}