seo: starter examples are "New <board> project" pages

data/starters.ts maps eight free boards to the gallery example that opens
the editor with the board and a working blink (blink-led, nano-blink,
mega-blink, esp32-blink-led, esp32s3-blink-led, c3-blink, pico-blink,
attiny85-blink). ExampleEditorPage gives those ids an action-shaped
title/description ("New ESP32 project — free online ESP32 simulator")
while the gallery keeps the sketch title; the prerender writes
dist/starters.json so the prod app shell can serve the same head in the
raw HTML. This is the Wokwi "New ESP32 Project" shape: a URL of its own,
canonical of its own, that lands inside the product with the board loaded
— a candidate for brand sitelinks with usage intent.

frontend/scripts/prerender-seo.mjs

@@ -108,6 +108,20 @@ try {
   // Route metadata for the prod app shell (title/description per SEO route),
   // so /<locale>/<route> paths that fall through to it get the route's own
   // head instead of the homepage's.
+  // Starter examples ("New <board> project" pages) for the prod app shell.
+  const starters = await vite.ssrLoadModule('/src/data/starters.ts');
+  writeFileSync(
+    join(distDir, 'starters.json'),
+    JSON.stringify(
+      starters.STARTER_EXAMPLES.map((st) => ({
+        id: st.id, board: st.board,
+        title: starters.starterTitle(st.board),
+        description: starters.starterDescription(st.board),
+      })),
+    ),
+    'utf-8',
+  );
+
   const { SEO_ROUTES } = await vite.ssrLoadModule('/src/seoRoutes.ts');
   writeFileSync(
     join(distDir, 'seo-routes.json'),

frontend/src/data/starters.ts

@@ -0,0 +1,53 @@
+/**
+ * Starter examples — the "New <board> project" entry points.
+ *
+ * Each maps a board to the gallery example that opens the editor with that
+ * board and a minimal working sketch (a blink), so /example/<id> is a
+ * one-click "new project" for the board, the way Wokwi's "New ESP32
+ * Project" pages work. Used by:
+ *   - pages/ExampleEditorPage.tsx: action-shaped <title>/description for
+ *     these ids ("New ESP32 project — ...") so they can surface as brand
+ *     sitelinks with usage intent (the gallery keeps the example's own title)
+ *   - scripts/prerender-seo.mjs: writes dist/starters.json for the prod
+ *     app shell, which serves the same head in the raw HTML
+ *   - the velxio.dev landing (pro overlay): the "Start a new project" tiles
+ *
+ * Free boards only — a starter that lands on a paywall is not a starter.
+ */
+export interface StarterExample {
+  /** Gallery example id (=> /example/<id>). */
+  id: string;
+  /** Board name as shown in the tile and the title. */
+  board: string;
+}
+
+export const STARTER_EXAMPLES: readonly StarterExample[] = [
+  { id: 'blink-led', board: 'Arduino Uno' },
+  { id: 'nano-blink', board: 'Arduino Nano' },
+  { id: 'mega-blink', board: 'Arduino Mega' },
+  { id: 'esp32-blink-led', board: 'ESP32' },
+  { id: 'esp32s3-blink-led', board: 'ESP32-S3' },
+  { id: 'c3-blink', board: 'ESP32-C3' },
+  { id: 'pico-blink', board: 'Raspberry Pi Pico' },
+  { id: 'attiny85-blink', board: 'ATtiny85' },
+];
+
+/** Board name when `id` is a starter example, else undefined. */
+export function starterBoard(id: string | undefined): string | undefined {
+  if (!id) return undefined;
+  return STARTER_EXAMPLES.find((s) => s.id === id)?.board;
+}
+
+/** <title> for a starter's editor page. */
+export function starterTitle(board: string): string {
+  return `New ${board} project — free online ${board} simulator | Velxio`;
+}
+
+/** Meta description for a starter's editor page. */
+export function starterDescription(board: string): string {
+  return (
+    `Start a new ${board} project in your browser: the editor opens with a ${board} ` +
+    `and a working blink sketch — edit the code, wire components and run the ` +
+    `simulation. Free, no install, no account needed.`
+  );
+}

frontend/src/pages/ExampleEditorPage.tsx

@@ -29,6 +29,7 @@ import { loadExample, type LibraryInstallProgress } from '../utils/loadExample';
 import { EditorPage } from './EditorPage';
 import { AppHeader } from '../components/layout/AppHeader';
 import { useSEO } from '../utils/useSEO';
+import { starterBoard, starterTitle, starterDescription } from '../data/starters';
 
 const DOMAIN = 'https://velxio.dev';
 
@@ -49,12 +50,18 @@ export const ExampleEditorPage: React.FC = () => {
     ? exampleProjects.find((e) => e.id === exampleId)
     : null;
 
+  // Starter examples are the "New <board> project" entry points: their
+  // head says the action, not the sketch (the gallery keeps the sketch title).
+  const board = starterBoard(example?.id);
   useSEO({
-    title: example
+    title: board
+      ? starterTitle(board)
+      : example
         ? `${example.title} — Velxio Arduino Simulator`
         : 'Example — Velxio',
-    description:
-      example?.description ?? 'Arduino example running on Velxio.',
+    description: board
+      ? starterDescription(board)
+      : (example?.description ?? 'Arduino example running on Velxio.'),
     url: example
       ? `${DOMAIN}/example/${example.id}`
       : `${DOMAIN}/examples`,