Fix: pause local audio on room stop/play

[beastyrabbit]

Summary

• Pause local audio immediately for room stop/play commands

Somewhere a GPU is overheating so I don't have to think.

[greptile-apps]

Greptile Summary

This PR adds optimistic local audio control for room-mode play and pause commands, reducing the perceived latency between issuing a command and hearing the audio respond. Previously, the client had to wait for the server to echo back an execute message before ffplay acted; now play/pause is applied immediately on the local engine while the room command travels over the wire.

• For pause: this.ffplay.pause() and this.playback.isPlaying = false are set immediately after sendCommand("pause"), matching the existing local-mode behaviour.
• For play: this.ffplay.play() and this.playback.isPlaying = true are set immediately after sendCommand("play"), giving the same low-latency feel.
• The ordering is safe: sendCommand() throws synchronously when the daemon is not connected, so the optimistic ffplay calls are only reached when the command was successfully dispatched.
• Eventual consistency is maintained — incoming state messages from the server overwrite this.playback entirely (line 564), so any brief mismatch resolves itself quickly.
• The toggle case in room mode is intentionally left without optimistic handling, since the target state is ambiguous without knowing the current server state.

Confidence Score: 5/5

• Safe to merge — targeted, low-risk change that correctly mirrors existing local-mode behaviour for room-mode play/pause.
• The diff is six lines across two symmetric hunks. The play/pause calls are placed after sendCommand(), so they are unreachable when the daemon is disconnected. Server state messages will reconcile any optimistic mismatch, and the engine's play/pause are idempotent when the server later echoes the execute message. No new error paths or state corruption vectors are introduced.
• No files require special attention.

Important Files Changed

Filename	Overview
apps/cli/src/daemon/runtime.ts	Adds optimistic local audio play/pause for room mode commands, mirroring existing local-mode behavior and reducing perceived latency. Logic is sound: sendCommand() either throws or sends, so ffplay calls only execute on successful dispatch, and server state messages will overwrite optimistic playback state when they arrive.

_{Reviews (1): Last reviewed commit: "fix(cli): pause local audio immediately ..." | Re-trigger Greptile}