feat(android): music keeps playing with the screen off

While a track plays, the page asks the shell to stay awake
(playback:keep-alive): on Android the cast's foreground service and
visible WebView, with a notification; on desktop a power save blocker.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/packages/meshbay-hub/src/meshbay_hub/static/platform.js b/packages/meshbay-hub/src/meshbay_hub/static/platform.js
index c131495..0174edc 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/platform.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/platform.js
@@ -204,6 +204,16 @@ export const folder = {
   async forget() { return bridge && bridge.folder ? bridge.folder.forget() : false; },
 };
 
+/**
+ * Music is playing: the shell keeps what playback needs awake (on a phone, the
+ * page itself with the screen off). A no-op in a browser.
+ */
+export const playback = {
+  keepAlive(on) {
+    if (bridge && bridge.playback) bridge.playback.keepAlive(on).catch(() => {});
+  },
+};
+
 /** Pick a directory to add as a group root. Returns { path, name } or null. */
 export const rootPicker = {
   available: Boolean(bridge && bridge.rootPicker),