Party shared-control mode is inert: PartyPlaybackCommand is never dispatched

[LargeModGames]

Describe the bug
IoEvent::PartyPlaybackCommand(sync::PlaybackAction) is declared in src/infra/network/mod.rs, listed in the Spotify-auth bypass gate, and has a full handler, but nothing in the UI or handlers ever dispatches it. So a guest in shared-control mode has no way to send play/pause/skip to the host, and SetPartyControlMode toggles a mode with no observable effect.

To Reproduce
Steps to reproduce the behavior:

1. Host a listening party and set control mode to shared
2. Join as a guest from a second instance
3. Press transport keys (play/pause/skip) as the guest
4. Nothing is relayed to the host

Expected behavior
Guest transport commands are relayed to the host while shared control is enabled.

Desktop (please complete the following information):

• OS: all
• Terminal: any
• Version: 0.41.0

Additional context
The network plumbing (relay message, host-side handling) appears complete; the missing piece is guest-side dispatch wiring in the party/playbar handlers. Found in a code audit.

[spotatui]

🎧 spotatui triage

Auto-triaged with DeepSeek V4-Flash.

Label: bug
Likely area: Party shared-control guest dispatch

Summary

The party shared-control mode is non-functional because the PartyPlaybackCommand event is never dispatched from the UI, so guests cannot send transport commands to the host. Although the network handler exists, no guest-side code triggers it, making the control mode toggle have no observable effect. This affects users trying to collaborate in a listening party, as guest play/pause/skip actions are silently ignored.

Key points

• IoEvent::PartyPlaybackCommand and SetPartyControlMode are declared and have handlers, but nothing dispatches them.
• Reproduction: host a party with shared control, join as guest, press transport keys; nothing is relayed.
• Expected: guest transport commands are relayed to the host while shared control is enabled.
• Affects version 0.41.0 on all OSes and terminals.
• Found via code audit; network plumbing appears complete, missing guest-side dispatch wiring.

Possible duplicates: none found

_{Compared against the 21 most recently updated open issues.}