feat(cast): music on the TV, the music bar as its remote

A cast button in Music's toolbar and in the music bar. With a television
chosen, each decrypted track goes to the relay with its cover — found as the
album card finds it — and plays there as music with its title, artist and
album; the bar's play, pause, seek, previous and next drive the receiver, its
clock is the receiver's, and the end of a track there moves the queue on.
A film or a photo taking the television pauses the bar; stopping the cast
carries the track on locally.

Photos and tracks now share one path: a whole file sent to the relay in
pieces (binary frames on Android, written to disk there), served at /file
with byte ranges and its cover at /cover, and loaded as what the relay says
it is. cast:image is gone; cast:chromecast:seek is new.

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

1 files changed, 5 insertions, 3 deletions

diff --git a/packages/meshbay-hub/tests/test_android_cast.py b/packages/meshbay-hub/tests/test_android_cast.py
index b537df7..ebcdec4 100644
--- a/packages/meshbay-hub/tests/test_android_cast.py
+++ b/packages/meshbay-hub/tests/test_android_cast.py
@@ -103,12 +103,14 @@ def test_the_receiver_is_pointed_at_the_relay_and_nothing_else():
 def test_relay_calls_keep_their_order():
     """The page does not await each push; on a pool they could overtake."""
     channels = _read(CAST / "CastChannels.kt")
-    assert '"cast:start", "cast:push", "cast:subtitle", "cast:image", "cast:finish", "cast:stop"' in channels
+    assert '"cast:start", "cast:push", "cast:subtitle",' in channels
+    assert ('"cast:file:begin", "cast:file:write", "cast:file:end", "cast:finish", "cast:stop"'
+            in channels)
     bridge = _read(SRC / "bridge" / "Bridge.kt")
     assert "Executors.newSingleThreadExecutor()" in bridge
     assert "(if (ordered) serial else work).execute" in bridge
-    assert "fun ordered(frame: BinaryFrame) = frame.channel == BinaryFrame.CAST_PUSH" in _read(
-        SRC / "bridge" / "Channels.kt")
+    assert ("fun ordered(frame: BinaryFrame) = frame.channel == BinaryFrame.CAST_PUSH"
+            " || frame.channel == BinaryFrame.CAST_FILE") in _read(SRC / "bridge" / "Channels.kt")
 
 
 def test_screen_off_survival_is_switched_on_only_while_casting_or_playing():