feat(hub): Videos and Music list their cards a page at a time

Previous/next arrows in the pinned toolbar, on group pages and in Search.
Page size is an account preference (Settings → Defaults), 50 by default,
10 to 200 in steps of 10.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/packages/meshbay-hub/tests/test_sticky_header.py b/packages/meshbay-hub/tests/test_sticky_header.py
index 32b8124..741b57f 100644
--- a/packages/meshbay-hub/tests/test_sticky_header.py
+++ b/packages/meshbay-hub/tests/test_sticky_header.py
@@ -78,6 +78,19 @@ def test_every_view_was_reached(measured):
         f"expected {EXPECTED_CASES} measurements, got {len(measured)}")
 
 
+def test_media_toolbars_were_measured_with_their_page_arrows(measured):
+    """
+    Videos and Music put previous/next arrows in the pinned toolbar once a
+    library is longer than a page (`pager.js`). The fixture sets a page smaller
+    than its library so every measurement above covers the toolbar with them;
+    this fails the fixture if that stops being true.
+    """
+    media = [c for c in measured if c["name"].split(" @")[0].endswith(("videos", "music"))]
+    assert media, "no Videos or Music case was measured"
+    bare = [c["name"] for c in media if not c.get("pager")]
+    assert not bare, "measured without page arrows: " + ", ".join(bare)
+
+
 def test_the_page_really_scrolled(measured):
     """
     Everything below compares a scrolled page with an unscrolled one. A view