Name the FAB menu, scroll it, and let its items leave

Its trigger holds two aria-hidden icons and wrote aria-label only when a caller
passed `label`, so an unnamed button was the default; `label` now falls back to
"Toggle menu" and is always written. The list had no ceiling, so six items ran
off a landscape phone — it now scrolls under the FAB, which stays put — and its
items rose into place but vanished on close, because the popover took its
display away before they could move. Plan step 18, actions.md ACT-21, ACT-32,
ACT-33.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9

resources/css/components/actions.css

@@ -68,3 +68,16 @@
         }
     }
 }
+
+/*
+ * A FAB menu's items rise into place as the list opens and sink back as it closes. The entry is
+ * `@starting-style` on the item itself; the exit needs the state to be readable while the popover
+ * is on its way out, which is what `:not(:popover-open)` is — the popover keeps `display: flex`
+ * for the length of its own discrete transition, so the items have somewhere to animate to.
+ *
+ * Unlayered (a plain rule, not an `@utility`), so it beats the item's own utilities.
+ */
+[data-fab-menu]:not(:popover-open) > * {
+    translate: 0 0.5rem;
+    opacity: 0;
+}