fix: clarify partial unmapped map filters

frontend/src/components/maps/LocationMapBottomSheet.jsx

@@ -84,6 +84,7 @@ export default function LocationMapBottomSheet({
   const changedLayerCount = DISPLAY_CONTROLS.filter(([key]) => filters[key] !== DEFAULT_MAP_FILTERS[key]).length;
   const unmappedItemPreview = visibleUnmappedItems.slice(0, 8);
   const overflowUnmappedItemCount = visibleUnmappedItems.length - unmappedItemPreview.length;
+  const hiddenUnmappedItemCount = Math.max(0, unmappedItemCount - visibleUnmappedItems.length);
   const hasHiddenUnmappedItems =
     filters.showUnmapped && unmappedItemCount > 0 && visibleUnmappedItems.length === 0;
   const selectedWidth = Number(selectedObject?.width) || 40;
@@ -438,6 +439,16 @@ export default function LocationMapBottomSheet({
               </li>
             ) : null}
           </ul>
+          {hiddenUnmappedItemCount > 0 ? (
+            <div className="location-map-zone-hidden-note">
+              <p className="location-map-muted">
+                {hiddenUnmappedItemCount} more hidden by layer filters.
+              </p>
+              <button type="button" onClick={showUnmappedItems}>
+                Show All Unmapped Items
+              </button>
+            </div>
+          ) : null}
         </div>
       ) : hasHiddenUnmappedItems ? (
         <div className="location-map-unmapped-list">

frontend/tests/location-map-manager.spec.ts

@@ -1539,6 +1539,57 @@ test("viewer explains when unmapped items are hidden by filters", async ({ page
   await expect(page.getByRole("button", { name: "Layers, 3 changed" })).toBeVisible();
 });
 
+test("viewer marks partial unmapped counts when filters hide some items", async ({ page }) => {
+  await mockMapShell(page);
+
+  const mapState = {
+    ...publishedMapState([], true),
+    items: [
+      {
+        id: 4110,
+        item_name: "visible batteries",
+        quantity: 1,
+        bought: false,
+        zone_id: null,
+        zone: null,
+        added_by_users: ["map-user"],
+      },
+      {
+        id: 4111,
+        item_name: "hidden batteries",
+        quantity: 1,
+        bought: false,
+        zone_id: null,
+        zone: null,
+        added_by_users: ["other-user"],
+      },
+    ],
+    unmapped_count: 2,
+  };
+
+  await page.route("**/households/1/locations/10/map", async (route) => {
+    await route.fulfill({
+      status: 200,
+      contentType: "application/json",
+      body: JSON.stringify(mapState),
+    });
+  });
+
+  await page.goto("/stores/100/locations/10/map");
+  await page.getByRole("button", { name: "Layers" }).click();
+  await page.getByLabel("Unmapped").check();
+
+  await expect(page.getByText("visible batteries")).toBeVisible();
+  await expect(page.getByText("hidden batteries")).toHaveCount(0);
+  await expect(page.getByText("1 more hidden by layer filters.")).toBeVisible();
+  await expect(page.getByRole("button", { name: "Show All Unmapped Items" })).toBeVisible();
+
+  await page.getByRole("button", { name: "Show All Unmapped Items" }).click();
+
+  await expect(page.getByText("hidden batteries")).toBeVisible();
+  await expect(page.getByText("1 more hidden by layer filters.")).toHaveCount(0);
+});
+
 test("viewer explains when selected zone items are hidden by filters", async ({ page }) => {
   await mockMapShell(page);