fix: restore Gitea 1.26 JS bundle and exclude checkboxes from input styling

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.

public/assets/css/theme-trans-pride-dark.css

@@ -135,13 +135,13 @@
 }
 
 /* Form inputs */
-.ui.input input {
+.ui.input input:not([type="checkbox"]):not([type="radio"]) {
   background-color: var(--color-input-background);
   border-color: var(--color-input-border);
   color: var(--color-text);
 }
 
-.ui.input input:focus {
+.ui.input input:not([type="checkbox"]):not([type="radio"]):focus {
   border-color: var(--color-primary);
 }