Frontend updates (#22327)

* add optional field widget

adds a switch to enable nullable fields like skip_motion_threshold

* config field updates

add skip_motion_threshold optional switch
add fps back to detect restart required

* don't use ternary operator when displaying motion previews

the main previews were being unnecessarily unmounted

* lazy mount motion preview clips to reduce DOM overhead

web/src/components/config-form/section-configs/detect.ts

@@ -30,10 +30,22 @@ const detect: SectionConfigOverrides = {
     ],
   },
   global: {
-    restartRequired: ["width", "height", "min_initialized", "max_disappeared"],
+    restartRequired: [
+      "fps",
+      "width",
+      "height",
+      "min_initialized",
+      "max_disappeared",
+    ],
   },
   camera: {
-    restartRequired: ["width", "height", "min_initialized", "max_disappeared"],
+    restartRequired: [
+      "fps",
+      "width",
+      "height",
+      "min_initialized",
+      "max_disappeared",
+    ],
   },
 };