fix(queue-captain): always send wantsCaptain value on toggle change

Unchecked HTML checkboxes are excluded from form serialization, so
untoggling the captain wish never sent the wantsCaptain value via
ws-send. Switch to hx-vals so the value is always included.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: garrappachc

src/queue-captain/views/html/wants-captain-toggle.tsx

@@ -18,11 +18,10 @@ export async function WantsCaptainToggle(props: { actor?: SteamId64 | undefined
     <label id="wants-captain-toggle" class="wants-captain-toggle" ws-send>
       <input
         type="checkbox"
-        name="wantsCaptain"
-        value={player.wantsCaptain ? 'false' : 'true'}
         checked={player.wantsCaptain}
         ws-send
         hx-trigger="change"
+        hx-vals={JSON.stringify({ wantsCaptain: player.wantsCaptain ? 'false' : 'true' })}
         data-umami-event="captain-toggle"
       />
       <IconCrown size={18} />