Add IP range filter button (.150–.155)

New "Filter .150–.155" button fetches all connected clients via
GET /api/all-clients (one request per site, grouped by AP MAC),
then hides any AP row that has no client with a last-octet IP
between 150 and 155. Clicking again clears the filter.

The name/site search and IP filter compose (AND logic) via a shared
applyFilters() function. Client data is cached in-memory for the
current page session so repeated toggles don't re-fetch.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/omada.py

@@ -188,6 +188,27 @@ class OmadaClient:
                 return int(device.get("uptimeLong", 0))
         raise RuntimeError(f"AP {mac} not found in site {site_key}")
 
+    async def get_all_clients(self) -> dict[str, list[dict]]:
+        """Return {ap_mac: [clients]} for every site (wireless clients only)."""
+        await self._ensure_ready()
+        ap_clients: dict[str, list] = {}
+        for site_name, site_key in self._sites.items():
+            try:
+                data = await self._request_with_retry(
+                    "GET",
+                    f"{OMADA_BASE_URL}/{self._omadac_id}/api/v2/sites/{site_key}/clients",
+                    params={"page": 1, "pageSize": 1000, "filters.active": "true"},
+                )
+                result = data.get("result", {})
+                clients = result.get("data", []) if isinstance(result, dict) else (result if isinstance(result, list) else [])
+                for c in clients:
+                    mac = c.get("apMac", "").upper().replace("-", ":")
+                    if mac:
+                        ap_clients.setdefault(mac, []).append(c)
+            except Exception as exc:
+                logger.warning("Failed to fetch clients for site '%s': %s", site_name, exc)
+        return ap_clients
+
     async def get_ap_clients(self, ap_mac: str, site_key: str) -> list[dict]:
         """Fetch wireless clients currently connected to a specific AP."""
         await self._ensure_ready()