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/lib/timeline.ts

@@ -23,6 +23,8 @@
  * and the public/ layout stay the frontend's business.
  */
 
+import type { OrgKind } from './hrefs.ts'
+
 export type DatePrecision = 'year' | 'month' | 'day'
 
 /** What an entry is about. Drives the marker and the body layout. */
@@ -41,6 +43,8 @@ export type TimelineRef = {
   kind: RefKind
   /** The row's TEXT primary key — an event id, org slug, team slug. */
   id: string
+  /** Only on organizations: history.js copies v_timeline.org_kind. */
+  orgKind?: OrgKind
 }
 
 /** Filename plus the table it came from; the directory is derived