feat: add slug-only dashboard profile filter and unify backend imports

backend/src/core/superset_client.py

@@ -150,11 +150,19 @@ class SupersetClient:
     # @PRE: Client is authenticated.
     # @POST: Returns a list of dashboard metadata summaries.
     # @RETURN: List[Dict]
-    def get_dashboards_summary(self) -> List[Dict]:
+    def get_dashboards_summary(self, require_slug: bool = False) -> List[Dict]:
         with belief_scope("SupersetClient.get_dashboards_summary"):
             # Rely on list endpoint default projection to stay compatible
             # across Superset versions and preserve owners in one request.
             query: Dict[str, Any] = {}
+            if require_slug:
+                query["filters"] = [
+                    {
+                        "col": "slug",
+                        "opr": "neq",
+                        "value": "",
+                    }
+                ]
             _, dashboards = self.get_dashboards(query=query)
 
             # Map fields to DashboardMetadata schema
@@ -232,23 +240,35 @@ class SupersetClient:
         page: int,
         page_size: int,
         search: Optional[str] = None,
+        require_slug: bool = False,
     ) -> Tuple[int, List[Dict]]:
         with belief_scope("SupersetClient.get_dashboards_summary_page"):
             query: Dict[str, Any] = {
                 "page": max(page - 1, 0),
                 "page_size": page_size,
             }
+            filters: List[Dict[str, Any]] = []
+            if require_slug:
+                filters.append(
+                    {
+                        "col": "slug",
+                        "opr": "neq",
+                        "value": "",
+                    }
+                )
             normalized_search = (search or "").strip()
             if normalized_search:
                 # Superset list API supports filter objects with `opr` operator.
                 # `ct` -> contains (ILIKE on most Superset backends).
-                query["filters"] = [
+                filters.append(
                     {
                         "col": "dashboard_title",
                         "opr": "ct",
                         "value": normalized_search,
                     }
-                ]
+                )
+            if filters:
+                query["filters"] = filters
 
             total_count, dashboards = self.get_dashboards_page(query=query)