feat(catalog): persist bounds filter state in URL

- Add urlBounds and filterByBounds computed from URL query
- Add setBoundsInUrl and clearBoundsFromUrl actions
- Update index.vue to use URL-based bounds state
- Bounds written to URL as comma-separated values (west,south,east,north)

This enables sharing links with map viewport bounds filter.

app/composables/useCatalogSearch.ts

@@ -84,6 +84,18 @@ export function useCatalogSearch() {
   const hubId = computed(() => route.query.hub as string | undefined)
   const quantity = computed(() => route.query.qty as string | undefined)
 
+  // Map bounds from URL (format: west,south,east,north)
+  const urlBounds = computed(() => {
+    const b = route.query.bounds as string | undefined
+    if (!b) return null
+    const parts = b.split(',').map(Number)
+    if (parts.length !== 4 || parts.some(isNaN)) return null
+    return { west: parts[0], south: parts[1], east: parts[2], north: parts[3] }
+  })
+
+  // Filter by bounds checkbox state from URL
+  const filterByBounds = computed(() => route.query.bounds !== undefined)
+
   // Get label for a filter (from cache or fallback to ID)
   const getLabel = (type: string, id: string | undefined): string | null => {
     if (!id) return null
@@ -237,6 +249,21 @@ export function useCatalogSearch() {
     updateQuery({ qty })
   }
 
+  // Set map bounds in URL (for filter by map feature)
+  const setBoundsInUrl = (bounds: { west: number; south: number; east: number; north: number } | null) => {
+    if (bounds) {
+      const boundsStr = `${bounds.west.toFixed(4)},${bounds.south.toFixed(4)},${bounds.east.toFixed(4)},${bounds.north.toFixed(4)}`
+      updateQuery({ bounds: boundsStr })
+    } else {
+      updateQuery({ bounds: null })
+    }
+  }
+
+  // Clear bounds from URL
+  const clearBoundsFromUrl = () => {
+    updateQuery({ bounds: null })
+  }
+
   const openInfo = (type: InfoEntityType, uuid: string) => {
     updateQuery({ info: `${type}:${uuid}`, select: null, infoTab: null, infoProduct: null })
   }
@@ -350,6 +377,8 @@ export function useCatalogSearch() {
     quantity,
     searchQuery,
     mapViewMode,
+    urlBounds,
+    filterByBounds,
 
     // Drawer state
     isDrawerOpen,
@@ -373,6 +402,8 @@ export function useCatalogSearch() {
     removeFilter,
     editFilter,
     setQuantity,
+    setBoundsInUrl,
+    clearBoundsFromUrl,
     openInfo,
     closeInfo,
     setInfoTab,

app/pages/catalog/index.vue

@@ -13,7 +13,7 @@
     :related-points="relatedPoints"
     @select="onMapSelect"
     @bounds-change="onBoundsChange"
-    @update:filter-by-bounds="filterByBounds = $event"
+    @update:filter-by-bounds="$event ? setBoundsInUrl(currentMapBounds) : clearBoundsFromUrl()"
   >
     <!-- Panel slot - shows selection list OR info OR quote results -->
     <template #panel>
@@ -82,8 +82,7 @@ const localePath = useLocalePath()
 // Ref to CatalogPage for accessing bounds
 const catalogPageRef = ref<{ currentBounds: Ref<MapBounds | null> } | null>(null)
 
-// Filter by map bounds state
-const filterByBounds = ref(false)
+// Current map bounds (local state, updated when map moves)
 const currentMapBounds = ref<MapBounds | null>(null)
 
 // Hovered item for map highlight
@@ -103,6 +102,10 @@ const currentSelectionItems = computed(() => {
 // Handle bounds change from map
 const onBoundsChange = (bounds: MapBounds) => {
   currentMapBounds.value = bounds
+  // If filter by bounds is enabled, write to URL
+  if (filterByBounds.value) {
+    setBoundsInUrl(bounds)
+  }
 }
 
 const {
@@ -122,7 +125,11 @@ const {
   openInfo,
   closeInfo,
   setInfoProduct,
-  setLabel
+  setLabel,
+  urlBounds,
+  filterByBounds,
+  setBoundsInUrl,
+  clearBoundsFromUrl
 } = useCatalogSearch()
 
 // Info panel composable
@@ -230,12 +237,15 @@ watch(productId, (newProductId) => {
 }, { immediate: true })
 
 // Apply bounds filter when "filter by map bounds" is enabled
-watch([filterByBounds, currentMapBounds], ([enabled, bounds]) => {
+// Use URL bounds if available, otherwise use current map bounds
+watch([filterByBounds, urlBounds, currentMapBounds], ([enabled, urlB, mapB]) => {
+  // Use URL bounds if available, otherwise current map bounds
+  const bounds = urlB || mapB
   const boundsToApply = enabled && bounds ? bounds : null
   setHubBoundsFilter(boundsToApply)
   setSupplierBoundsFilter(boundsToApply)
   setProductBoundsFilter(boundsToApply)
-})
+}, { immediate: true })
 
 // Watch infoId to load info data
 watch(infoId, async (info) => {