Gitea 1.26.0 moved the main JS bundle load to base/footer.tmpl via
ScriptImport, which our custom footer override was stripping out. This
caused all JavaScript-dependent features (dropdowns, etc.) to break.
Also excludes checkbox and radio inputs from the custom form input
styling rules, as Gitea 1.26 reworked checkboxes to use appearance:none
with a CSS mask-image approach that conflicts with our border-radius and
background overrides.