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/Community.tsx

@@ -1,5 +1,5 @@
 import PageShell from "../components/PageShell.tsx";
-import { useSectionManifest } from "../lib/sections.tsx";
+import { defineSection, useSectionManifest } from "../lib/sections.tsx";
 import OrgListMap, { OrgMapToggle } from "./sections/OrgList-Map.tsx";
 import OrgListVertical from "./sections/OrgList-Vertical.tsx";
 import OrgListCards from "./sections/OrgList-Card.tsx";
@@ -13,7 +13,7 @@ import OrgListCards from "./sections/OrgList-Card.tsx";
    ═══════════════════════════════════════════════════════════════ */
 
 const SECTIONS = [
-  {
+  defineSection({
     id: "chapters",
     title: "Local Chapters",
     blurb:
@@ -22,8 +22,8 @@ const SECTIONS = [
     background: "#eef9fb",
     Component: OrgListMap,
     views: { options: ["map", "grid"], default: "map", Toggle: OrgMapToggle },
-  },
-  {
+  }),
+  defineSection({
     id: "regions",
     title: "Unity Regions",
     blurb:
@@ -40,8 +40,8 @@ const SECTIONS = [
         { key: "international", title: "International Unity Regions" },
       ],
     },
-  },
-  {
+  }),
+  defineSection({
     id: "partners",
     title: "Partner Organizations",
     blurb:
@@ -54,7 +54,7 @@ const SECTIONS = [
       pageLabel: "Partner page",
       empty: "· Partner organizations coming soon ·",
     },
-  },
+  }),
 ];
 
 export default function CommunityPage() {