Fix frontend extension session state and tool routes (#8464)

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ui/desktop/openapi.json

@@ -116,14 +116,45 @@
           "401": {
             "description": "Unauthorized - invalid secret key"
           },
+          "403": {
+            "description": "Forbidden - tool is not app-visible",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ErrorResponse"
+                }
+              }
+            }
+          },
           "404": {
-            "description": "Resource not found"
+            "description": "Resource not found",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ErrorResponse"
+                }
+              }
+            }
           },
           "424": {
-            "description": "Agent not initialized"
+            "description": "Frontend tool execution requires the frontend host",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ErrorResponse"
+                }
+              }
+            }
           },
           "500": {
-            "description": "Internal server error"
+            "description": "Internal server error",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ErrorResponse"
+                }
+              }
+            }
           }
         }
       }