Add voice channel member count (non-bot users) to soundboard
channel API response and display it in the dropdown, matching
the radio plugin's existing behavior.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Radio: Move controls from bottom bar to topbar above globe
(guild/channel selectors, now playing, volume, connection, stop)
- Radio: Theme selector moved inline into topbar-right
- Radio: Globe now fills remaining space below topbar
- Soundboard: Fix connection modal not opening when voiceStats is null
(modal now renders with '---' values when no voice data available)
- Both: Modal condition changed from `showConnModal && voiceStats` to
just `showConnModal`, handling null voiceStats gracefully
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
