Miscellaneous fixes (#23610)

* Handle back seeking going to previous clip

* scope /recordings/unavailable query to the caller's allowed cameras

* listen for config updates in activity manager

* don't set search after awaited request

Intentionally do NOT setSearch() to mark the open event submitted. This runs after the awaited request, by which point the user may have closed the dialog; re-setting the parent's selected event would resurrect it and the force-open effect would reopen it (see #23599). The local "submitted" state covers the open card, and mutate() updates the events cache so the grid and any future open reflect the result.

* fix ruff

#23201 removed pathlib import but for some reason it's just now causing ruff to fail

---------

Co-authored-by: Nicolas Mowen <nickmowen213@gmail.com>

frigate/test/http_api/test_http_media.py

@@ -475,3 +475,55 @@ class TestHttpMedia(BaseTestHttp):
 
             assert response.status_code == 200
             assert response.json() == []
+
+    def test_recordings_unavailable_cameras_all_scopes_to_allowed_cameras(self):
+        """cameras=all must not error and must only consider allowed cameras.
+
+        allowed_cameras is mocked to ["front_door"]. A back_door recording that
+        would otherwise fill the gap must be ignored, and the request must not
+        500 the way it did when cameras was reassigned to a list.
+        """
+        with AuthTestClient(self.app) as client:
+            # front_door has a 20s gap (1010-1030).
+            Recordings.insert(
+                id="front_a",
+                path="/media/recordings/front_a.mp4",
+                camera="front_door",
+                start_time=1000,
+                end_time=1010,
+                duration=10,
+                motion=0,
+            ).execute()
+            Recordings.insert(
+                id="front_b",
+                path="/media/recordings/front_b.mp4",
+                camera="front_door",
+                start_time=1030,
+                end_time=1040,
+                duration=10,
+                motion=0,
+            ).execute()
+            # back_door is not in allowed_cameras; its full-window coverage must
+            # not mask the front_door gap.
+            Recordings.insert(
+                id="back_a",
+                path="/media/recordings/back_a.mp4",
+                camera="back_door",
+                start_time=1000,
+                end_time=1040,
+                duration=40,
+                motion=0,
+            ).execute()
+
+            response = client.get(
+                "/recordings/unavailable",
+                params={
+                    "after": 1000,
+                    "before": 1040,
+                    "scale": 5,
+                    "cameras": "all",
+                },
+            )
+
+            assert response.status_code == 200
+            assert response.json() == [{"start_time": 1010, "end_time": 1030}]