Live streaming tech selection (#24374)

* allow users to select live streaming technology

* fix webrtc being downgraded to mse on load

`useUserPersistence` seeds state with the default and loads asynchronously, so the first render always used `mse` instead of the saved choice, and `useWebRTCGloballyAvailable` reports `checking` until the probe settles and re-enters that state on every consumer mount, so a saved `webrtc` was rewritten to `mse` even after the probe had already passed. On Safari the MSE player then timed out and latched the jsmpeg fallback. A pending probe now counts as available, the player waits on `autoLive` until the stored preferences load, and `handleError` gates on the mode in use since the fallback flag no longer implies webrtc is untried. A rejected IndexedDB read also resolves `loaded` now, so a blocked store can't leave the player waiting forever.

* add support for configurable ICE servers in WebRTC player

* add mic error state, fix dialog overwriting saved choice and dashboard ignoring stream

* tweaks

web/src/utils/uiSettingsTransfer.ts

@@ -10,6 +10,7 @@ export type TransferSection = "layouts" | "streaming" | "preferences";
 const cameraStreamingSettingsSchema = z.object({
   streamName: z.string(),
   streamType: z.enum(["no-streaming", "smart", "continuous"]),
+  playerMode: z.enum(["mse", "webrtc", "jsmpeg"]).optional().catch(undefined),
   compatibilityMode: z.boolean(),
   playAudio: z.boolean(),
   volume: z.number(),