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/components/stat-block-parts.tsx

@@ -71,7 +71,9 @@ const FREE_ACTION_CHEVRON = "M48 27 L71 50 L48 73 Z";
 const REACTION_ARROW =
 	"M75 15 A42 42 0 1 0 85 55 L72 55 A30 30 0 1 1 65 25 L65 40 L92 20 L65 0 L65 15 Z";
 
-function ActivityIcon({ activity }: Readonly<{ activity: ActivityCost }>) {
+export function ActivityIcon({
+	activity,
+}: Readonly<{ activity: ActivityCost }>) {
 	const cls = "inline-block h-[1em] align-[-0.1em]";
 	if (activity.unit === "free") {
 		return (