feat: add trust selection to drawer with filter wiring (Task 5.1)

dash_app/data/card_browser.py

@@ -81,3 +81,15 @@ def get_all_drugs() -> list[str]:
 
     data = load_initial_data()
     return data.get("available_drugs", [])
+
+
+def get_all_trusts() -> list[str]:
+    """
+    Return a sorted flat list of all unique trust names from pathway_nodes level 1.
+
+    Delegates to load_initial_data() which already queries the database.
+    """
+    from dash_app.data.queries import load_initial_data
+
+    data = load_initial_data()
+    return data.get("available_trusts", [])

dash_app/data/queries.py

@@ -26,6 +26,7 @@ def load_pathway_data(
     chart_type: str = "directory",
     selected_drugs: Optional[list[str]] = None,
     selected_directorates: Optional[list[str]] = None,
+    selected_trusts: Optional[list[str]] = None,
 ) -> dict:
     """Load pre-computed pathway nodes with optional filters."""
     return _load_pathway_nodes(
@@ -34,4 +35,5 @@ def load_pathway_data(
         chart_type=chart_type,
         selected_drugs=selected_drugs,
         selected_directorates=selected_directorates,
+        selected_trusts=selected_trusts,
     )