Add chips, choices and search

M3's assist, filter, input and suggestion chips with chip sets; choices
as filter chips or a searchable combobox whose list is an anchored
popover; and the search bar that opens into a docked or full-screen
search view.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V9NnLxnPp8vaaurb3Z1MFy

resources/css/components/field.css

@@ -221,6 +221,11 @@
         cursor: default;
     }
 
+    /* A combobox's arrow turns over while its list is open, as a select's does. */
+    .field:has(.field-control[aria-expanded="true"]) .field-arrow {
+        rotate: 180deg;
+    }
+
     .field-arrow {
         transition: rotate var(--md-sys-motion-effects-fast-duration) var(--md-sys-motion-effects-fast);
     }