feat: build home page from home.json sections

- Hero with callsign/locator tags and CTAs on khaki grid
- Feature sections for ARD (YM1KTC), DMR Türkiye, QRV73!, QRZ73!
- Telegram groups and resource site card grids
- Latest posts block with empty state (wired to blog in stage 4)
- Section wrapper, decorative numerals, external Button variant

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

src/lib/data.ts

@@ -5,8 +5,10 @@
 import { z } from 'astro/zod';
 import siteJson from '../data/site.json';
 import socialJson from '../data/social.json';
+import homeJson from '../data/home.json';
 
 const link = z.object({ label: z.string().min(1), href: z.string().min(1) });
+const icon = z.string().startsWith('tabler:');
 
 const siteSchema = z.object({
   name: z.string(),
@@ -47,11 +49,68 @@ const socialSchema = z.array(
     label: z.string(),
     // Empty string = account not set → hidden in the UI.
     href: z.union([z.url(), z.literal('')]),
-    icon: z.string().startsWith('tabler:'),
+    icon,
     handle: z.string().optional(),
   }),
 );
 
+const homeSchema = z.object({
+  seo: z.object({ description: z.string().max(160) }),
+  hero: z.object({
+    numeral: z.string(),
+    tags: z.array(z.object({ icon, label: z.string() })),
+    asideTitle: z.string(),
+    asideBody: z.string(),
+    asideLink: link,
+    eyebrow: z.string(),
+    title: z.string(),
+    lead: z.string(),
+    ctas: z.array(
+      link.extend({ variant: z.enum(['primary', 'secondary', 'link']), icon: icon.optional() }),
+    ),
+  }),
+  sections: z.array(
+    z.discriminatedUnion('type', [
+      z.object({
+        type: z.literal('feature'),
+        id: z.string(),
+        eyebrow: z.string(),
+        title: z.string(),
+        body: z.string(),
+        callsign: z.string().optional(),
+        callsignLabel: z.string().optional(),
+        icon,
+        link: link.extend({ href: z.url() }),
+      }),
+      z.object({
+        type: z.literal('cards'),
+        id: z.string(),
+        eyebrow: z.string(),
+        title: z.string(),
+        items: z
+          .array(
+            z.object({
+              title: z.string(),
+              description: z.string().optional(),
+              href: z.url(),
+              icon,
+            }),
+          )
+          .min(1),
+      }),
+      z.object({
+        type: z.literal('latestPosts'),
+        id: z.string(),
+        eyebrow: z.string(),
+        title: z.string(),
+        count: z.number().int().positive(),
+        allLink: link,
+        empty: z.string(),
+      }),
+    ]),
+  ),
+});
+
 function parse<T>(name: string, schema: z.ZodType<T>, data: unknown): T {
   const result = schema.safeParse(data);
   if (!result.success) {
@@ -61,7 +120,9 @@ function parse<T>(name: string, schema: z.ZodType<T>, data: unknown): T {
 }
 
 export const site = parse('site.json', siteSchema, siteJson);
+export const home = parse('home.json', homeSchema, homeJson);
 export const social = parse('social.json', socialSchema, socialJson).filter((s) => s.href);
 
 export type Site = z.infer<typeof siteSchema>;
+export type HomeSection = (typeof home.sections)[number];
 export type SocialLink = (typeof social)[number];