fix(admin): render boolean fields under wtforms 3.2

src/strands_compose_chat/admin/__init__.py

@@ -1 +1,10 @@
-"""Admin panel: sqladmin views and authentication backend."""
+"""Admin panel: sqladmin views and authentication backend.
+
+Importing this package applies the sqladmin/wtforms compatibility shim (see
+``compat``) so boolean form fields render under wtforms 3.2 before any admin
+view is constructed.
+"""
+
+from .compat import apply_wtforms_compat
+
+apply_wtforms_compat()

src/strands_compose_chat/admin/compat.py

@@ -0,0 +1,27 @@
+"""Compatibility shim for sqladmin widgets against supported wtforms versions.
+
+sqladmin's ``BooleanInputWidget`` subclasses wtforms' base ``Input`` widget
+without declaring ``validation_attrs``. wtforms 3.1 defined that attribute on the
+base ``Input`` class, so the widget inherited it; wtforms 3.2 moved
+``validation_attrs`` onto each concrete widget subclass, leaving
+``BooleanInputWidget`` without it. Rendering any boolean form field then raises
+``AttributeError`` inside ``Input.__call__``.
+
+This shim gives the widget the checkbox validation attributes it should have had,
+restoring boolean-field rendering under wtforms 3.2 without waiting on an sqladmin
+release. It is a no-op on wtforms 3.1, where the attribute is already inherited.
+"""
+
+from sqladmin.widgets import BooleanInputWidget
+from wtforms.widgets import CheckboxInput
+
+
+def apply_wtforms_compat() -> None:
+    """Ensure sqladmin's ``BooleanInputWidget`` declares ``validation_attrs``.
+
+    Idempotent: only assigns when the attribute is missing, so it is safe to call
+    once during app construction and does nothing on wtforms versions that already
+    provide it via the base ``Input`` widget.
+    """
+    if not hasattr(BooleanInputWidget, "validation_attrs"):
+        setattr(BooleanInputWidget, "validation_attrs", list(CheckboxInput.validation_attrs))