Go Live: state the Windows-only window-audio limitation in the UI and docs

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

live/src/GoLive.jsx

@@ -66,8 +66,9 @@ export default function GoLive({ onExit }) {
             <input value={title} onChange={e => setTitle(e.target.value)} disabled={phase === 'capturing'} />
             <div className="hint">
               Click <b>Start</b>, then pick the <b>WarDogs</b> window in Chrome's dialog and tick <b>Share audio</b>.
-              Window audio needs <b>Chrome or Edge 141 or newer</b> (chrome://version). Older browsers capture the window
-              without sound. Capped at {MAX_KBPS / 1000} Mbps, up to 1440p60, H.264.
+              Window audio needs <b>Windows</b> with <b>Chrome or Edge 141 or newer</b>. On Linux and Mac, Chrome can only
+              capture audio from a browser tab, so the window comes through without sound — use OBS with the dock there.
+              Capped at {MAX_KBPS / 1000} Mbps, up to 1440p60, H.264.
             </div>
             {err && <div className="err">{err}</div>}
             <button className="primary" disabled={!key || phase === 'capturing'} onClick={start}>{phase === 'capturing' ? 'Waiting for the window picker…' : 'Start'}</button>