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/pages/Home.tsx

@@ -149,7 +149,15 @@ const EDGE_FADE = `linear-gradient(to right,
   transparent calc(50% + (${HALF_SLIDE} + ${FADE_DIST})))`;
 
 {/* Functions */}
-function WaveText({ text, baseDelay = 0, step = 0.1 }) {
+function WaveText({
+  text,
+  baseDelay = 0,
+  step = 0.1,
+}: {
+  text: string;
+  baseDelay?: number;
+  step?: number;
+}) {
   return (
     <>
       {text.split("").map((char, i) => (
@@ -179,7 +187,7 @@ export default function Home() {
   const prev = () => setIndex(i => Math.max(0, i - 1));
   const next = () => setIndex(i => Math.min(EVENTS.length - 1, i + 1));
 
-  const arrowStyle = enabled => ({
+  const arrowStyle = (enabled: boolean) => ({
     border: `1px solid ${TEAL}`,
     background: "rgba(255,255,255,0.6)",
     color: enabled ? TEAL : "#b8c6c9",