refactor: move shared utilities to lib/shared/ sub-packages

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/lib/person/personHoverCard.ts

@@ -0,0 +1,23 @@
+import type { components } from '$lib/generated/api';
+
+type Person = components['schemas']['Person'];
+type RelationshipDTO = components['schemas']['RelationshipDTO'];
+
+/**
+ * Data the PersonHoverCard needs to render its loaded state.
+ * Bundled here so the orchestrator (TranscriptionReadView) and the view
+ * (PersonHoverCard) share one canonical shape.
+ */
+export type HoverData = { person: Person; relationships: RelationshipDTO[] };
+
+/**
+ * The hover card's three visible states.
+ *
+ * `loading`  — initial fetch in flight; skeleton is shown
+ * `error`    — fetch failed (non-404, non-OK); generic error message + footer link
+ * `loaded`   — fetch succeeded; person + relationships available
+ */
+export type LoadState =
+	| { status: 'loading' }
+	| { status: 'error' }
+	| { status: 'loaded'; person: Person; relationships: RelationshipDTO[] };