add automatic timeout to clear stale media rpc status

currently when a media app is closed or playback stops unexpectedly the rpc status can get stuck showing media playing indefinitely with glitched symbols and timer continuing to count up

this is related to issue 470 where users report discord keeps showing media playing after stopping playback on apps like deezer

suggested improvement:
add a configurable timeout mechanism that automatically clears the rpc status if no media updates are received for a certain period like 30 seconds or 1 minute

this would help in cases where:
- media apps crash or are force closed
- apps dont properly send stop events
- session callbacks fail to trigger

the timeout could be implemented in mediarpcservice by tracking the last update time and checking periodically if the status should be cleared

this would make the app more resilient to edge cases where media state gets out of sync