Add list styles: Podium, Spotlight, Grid, List

- Each list picks a style in List settings (new lists default to Podium);
  existing lists keep Grid or List
- Podium: top 3 on medal-colored steps (#1 center and raised), the rest
  behind a native <details> "Show N more"; stacks #1 over #2/#3 on phones
- Spotlight: #1 as a feature card (art, why-note or description, play
  button), the rest as a numbered list
- Visitors can switch styles on a list page (?style=), preserved across
  pages; later pages fall back to a plain list since they don't start at #1
- Entries' detail data now lives on a wrapper per list, so featured and
  collapsed entries all open the detail view

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/static/js/admin-list.js

@@ -54,7 +54,7 @@ const isFull = () => list.itemCount >= list.maxItems;
 
 document.querySelector("[data-action=edit-list]").addEventListener("click", () => {
   openListForm({
-    categories, limits, list,
+    categories, limits, styles: boot.styles, list,
     onSaved: (saved) => {
       // The artwork shape affects the whole editor, so redraw from scratch.
       if (saved.art !== list.art) { location.reload(); return; }