Type src/ against API and database shapes, fixing implicit anys

Adds .d.ts declarations beside the untyped JS modules imported from
TS (api.js, navConfig.js, adminSchema.js, adminNav.js, src/data/*),
with shapes taken from the server routes and migrations. get/post/
patch/del now return unknown unless the caller names the response.

Fixes found along the way:
- website/email/instagram are bare strings from splitLinks, not Link
  objects; OrganizationDetail's website and email pills rendered with
  no href or label and now link correctly.
- The chapter map falls back to FALLBACK_COLOR for a region with no
  colour instead of painting its tiles black.

Adds defineSection() so each page manifest entry's props are checked
against its own Component.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/data/eventData.d.ts

@@ -0,0 +1,27 @@
+/* Types for eventData.js. Rows are GET /events as shapeEvent in
+   server/src/routes/content.js sends them. */
+
+import type { EventType } from "../lib/eventTypes.ts";
+import type { EventListItem } from "../lib/useContent.ts";
+
+export type EventFilter = {
+  section?: string;
+  host?: string;
+  status?: EventListItem["status"];
+  type?: EventType | EventType[];
+};
+
+export declare function useEvents(filter?: EventFilter): {
+  events: EventListItem[];
+  loading: boolean;
+  error: Error | null;
+};
+
+export declare function splitByStatus<T extends { status: string }>(
+  events?: T[],
+): { upcoming: T[]; past: T[] };
+
+export declare function typesPresent<D extends { id: string }>(
+  events?: Array<{ event_type: string }>,
+  declared?: readonly D[],
+): D[];