fix(ui): keep the NowPlayingPanel badge in sync.

Introduced a new event, EVENT_STREAM_RECONNECTED, to track the last
timestamp of stream reconnections. This change updates the activity
reducer to handle the new event and modifies the NowPlayingPanel to
refresh data based on server and stream status.

Signed-off-by: Deluan <deluan@navidrome.org>

ui/src/eventStream.js

@@ -1,6 +1,6 @@
 import { baseUrl } from './utils'
 import throttle from 'lodash.throttle'
-import { processEvent, serverDown } from './actions'
+import { processEvent, serverDown, streamReconnected } from './actions'
 import { REST_URL } from './consts'
 import config from './config'
 
@@ -47,6 +47,8 @@ const connect = async (dispatchFn) => {
     const stream = await newEventStream()
     eventStream = stream
     setupHandlers(stream, dispatchFn)
+    // Dispatch reconnection event to refresh critical data
+    dispatchFn(streamReconnected())
     return stream
   } catch (e) {
     // eslint-disable-next-line no-console