fix(ui): enforce minimum width on all grid-based select modals

Apply miw="min(1400px, 90vw)" to app select and integration select
modals so they never shrink when filtering reduces visible items.

apps/nextjs/src/components/integration/integration-select-grid.tsx

@@ -28,7 +28,7 @@ export const IntegrationSelectGrid = ({ onSelect, enableMockIntegration = false
   const filtered = useMemo(() => filterIntegrations(integrations, search), [integrations, search]);
 
   return (
-    <Stack>
+    <Stack miw="min(1400px, 90vw)">
       <Input
         value={search}
         onChange={(event) => setSearch(event.currentTarget.value)}

packages/modals-collection/src/apps/app-select-modal.tsx

@@ -78,7 +78,7 @@ export const AppSelectModal = createModal<AppSelectModalProps>(({ actions, inner
   }
 
   return (
-    <Stack>
+    <Stack miw="min(1400px, 90vw)">
       <Input
         value={search}
         onChange={(event) => setSearch(event.currentTarget.value)}