A crowd you can find, and a phone 65px too narrow

Two reports against 1.6.0 and 1.7.0, both correct.

The crowd worked end to end and was, in practice, not there: the picker was
behind the ⋯ menu of a chat that already existed, and the switch was a card on
the Agents page, which made it read as an agent-chat feature. The picker is now
a button in the composer toolbar on both screens that include it, and on the
new-chat screen the choice rides along with the first message, so a chat can
start as a crowd instead of having to be converted into one. The instance
switch has its own page.

The width bug was the suggestion cards, exactly as reported. `.suggestions`
rendered 455px inside a 366px column, and the tree's standing rule applied on
its own made it worse -- 428px to 455px. A grid item carries `min-width: auto`,
which is a min-content floor, and a floor beats `width: 100%`; the floor is
measured while the percentage is indefinite, so `min(100%, …)` alone sends the
track to a card's max-content. Both halves now go on all four auto-fit grids,
and a test refuses either alone.

It survived four releases of narrow-width checking because the harness never
rendered that screen: `TestClient(app)` runs no lifespan outside a `with` block,
so the startup-seeded cards were missing from every shot ever taken of it. And
its overflow check skipped anything inside a scroller -- right for a table in
its own scroller, blind to the scroller itself, which `overflow-y: auto` makes
scroll sideways too. Both fixed; it now names the box and the child to blame.

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

tests/test_crowd_ui.py

@@ -70,6 +70,87 @@ def _members(db, chat) -> list[str]:
     ]
 
 
+# --- Reachable where somebody would look --------------------------------------
+#
+# The feature shipped in 1.6.0 switched on and unreachable: the only control was
+# inside the Chat settings panel, behind the ⋯ menu, in a chat that already
+# existed. The owner enabled it, went looking, and reported that there was nothing
+# to find. A control nobody can find is a feature nobody has, so these assert the
+# two places it has to be rather than the one place it was.
+def test_the_composer_offers_the_crowd_in_a_chat(client, db):
+    """Beside the tool switches, where the comparable decisions are."""
+    chat = _chat(db)
+    page = client.get(f"/chat/{chat.id}").text
+    assert 'name="crowd_model_ids"' in page
+    assert 'form="crowd-form"' in page
+    assert '<form id="crowd-form">' in page
+
+
+def test_the_composer_offers_the_crowd_before_the_chat_exists(client, db):
+    """On the new-chat screen there is no row to attach anybody to, so the choice
+    rides along with the first message — the mechanism the scope switches use."""
+    page = client.get("/chat").text
+    assert 'name="crowd_model_ids"' in page
+    # Riding along, so no sibling form and no PATCH: the composer's own POST
+    # carries it.
+    assert '<form id="crowd-form">' not in page
+    assert 'value="second-model"' in page
+
+
+def test_starting_a_chat_with_a_crowd_keeps_it(client, db):
+    """The end of that path: the first message creates the chat *and* its crowd."""
+    from sqlalchemy import select as sa_select
+
+    client.post(
+        "/api/chats/start",
+        data={
+            "content": "Who is right?",
+            "model_id": "main-model",
+            "crowd_model_ids": ["", "second-model", "third-model"],
+        },
+        follow_redirects=False,
+    )
+    db.expire_all()
+    chat = db.scalars(sa_select(Chat).order_by(Chat.created_at.desc())).first()
+    assert [row.model_id for row in sorted(chat.crowd, key=lambda r: r.position)] == [
+        "second-model",
+        "third-model",
+    ]
+
+
+def test_starting_a_chat_refuses_a_model_the_person_cannot_reach(client, db):
+    """The same rule as the panel, in the same one function, so there is nowhere
+    for the two to disagree."""
+    from sqlalchemy import select as sa_select
+
+    group = Group(name="Wheel")
+    db.add(group)
+    restricted = db.scalar(select(Model).where(Model.model_id == "third-model"))
+    restricted.public = False
+    restricted.groups = [group]
+    user = _user(db)
+    user.role = "user"
+    db.commit()
+
+    client.post(
+        "/api/chats/start",
+        data={
+            "content": "Who is right?",
+            "model_id": "main-model",
+            "crowd_model_ids": ["second-model", "third-model"],
+        },
+        follow_redirects=False,
+    )
+    db.expire_all()
+    chat = db.scalars(sa_select(Chat).order_by(Chat.created_at.desc())).first()
+    assert [row.model_id for row in chat.crowd] == ["second-model"]
+
+
+def test_the_composer_control_is_absent_while_the_feature_is_off(client, db):
+    settings_store.update(db, {"enabled": False}, key=settings_store.CROWD)
+    assert 'name="crowd_model_ids"' not in client.get("/chat").text
+
+
 # --- Choosing -----------------------------------------------------------------
 def test_the_panel_offers_the_other_models(client, db):
     chat = _chat(db)