feat: back up the phone's photos to a group, once a day on Wi-FiHEADmain

The Android application sends the photos taken on the phone to one folder of
one group chosen by the member (docs/MESHBAY_DESIGN.md §9.12). The phone lists
MediaStore, keeps a ledger of what was sent and hands each photo's bytes to the
page by an opaque token on the packaged origin; the page decides when a run is
due and uploads through the existing path, one photo at a time under a slot.

- Once a day from the last finished run, on an unmetered network only;
  "Back up now" asks first on mobile data. Leaving Wi-Fi stops after the file
  in flight.
- Photos already on the phone are sent by default, newest first, under
  <folder>/YYYY/MM; edits are sent beside the original as -edited-<date>.
- Additive by construction: nothing is ever deleted, renamed or replaced on
  the node, and a photo deleted on the node is not sent again.
- A confirmation names the group, owner, members, folder and size when the
  destination or starting point changes; a lasting refusal (disk full, folder
  read-only or gone, no longer a member) is said once and retried a day later.
- No ACCESS_MEDIA_LOCATION, so the platform redacts photo locations.
- A dataSync foreground service keeps a run going with the screen off.

HEIC/HEIF photos are sent but not shown in Photos yet (§15.2).

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

1 files changed, 5 insertions, 2 deletions

diff --git a/packages/meshbay-hub/tests/test_android_cast.py b/packages/meshbay-hub/tests/test_android_cast.py
index ebcdec4..82b36d6 100644
--- a/packages/meshbay-hub/tests/test_android_cast.py
+++ b/packages/meshbay-hub/tests/test_android_cast.py
@@ -113,11 +113,12 @@ def test_relay_calls_keep_their_order():
             " || frame.channel == BinaryFrame.CAST_FILE") in _read(SRC / "bridge" / "Channels.kt")
 
 
-def test_screen_off_survival_is_switched_on_only_while_casting_or_playing():
+def test_screen_off_survival_is_switched_on_only_while_casting_playing_or_backing_up():
     activity = _read(SRC / "MainActivity.kt")
     keep = activity.split("private fun keepAlive()", 1)[1].split("\n    }\n", 1)[0]
     assert "val on = casting || playing" in keep
-    assert "web.keepVisible = on" in keep
+    # A photo backup holds the page too, through its own service (§9.12).
+    assert "web.keepVisible = on || syncing" in keep
     assert "if (!on) { stopService(service); return }" in keep
     assert "startForegroundService(service)" in keep
     assert activity.count("keepVisible =") == 1, "the page is kept visible from one place only"
@@ -126,6 +127,8 @@ def test_screen_off_survival_is_switched_on_only_while_casting_or_playing():
     manifest = _read(MAIN / "AndroidManifest.xml")
     assert 'android:name=".cast.CastService"' in manifest
     assert 'android:foregroundServiceType="mediaPlayback"' in manifest
+    assert 'android:name=".photos.BackupService"' in manifest
+    assert 'android:foregroundServiceType="dataSync"' in manifest
 
 
 def test_the_receiver_is_given_what_the_desktop_gives_it():