Add PF2e spell description popovers in stat blocks

Clicking a spell name in a PF2e creature's stat block now opens a
popover (desktop) or bottom sheet (mobile) showing full spell details:
description, traits, rank, range, target, area, duration, defense,
action cost icons, and heightening rules. All data is sourced from
the embedded Foundry VTT spell items already in the bestiary cache.

- Add SpellReference type replacing bare string spell arrays
- Extract full spell data in pf2e-bestiary-adapter (description,
  traits, traditions, range, target, area, duration, defense,
  action cost, heightening, overlays)
- Strip inline heightening text from descriptions to avoid duplication
- Bold save outcome labels (Critical Success/Failure) in descriptions
- Bump DB_VERSION to 6 for cache invalidation
- Add useSwipeToDismissDown hook for mobile bottom sheet
- Portal popover to document.body to escape transformed ancestors

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/web/src/index.css

@@ -103,6 +103,19 @@
 	animation: slide-in-right 200ms ease-out;
 }
 
+@keyframes slide-in-bottom {
+	from {
+		transform: translateY(100%);
+	}
+	to {
+		transform: translateY(0);
+	}
+}
+
+@utility animate-slide-in-bottom {
+	animation: slide-in-bottom 200ms ease-out;
+}
+
 @keyframes confirm-pulse {
 	0% {
 		scale: 1;