feat: add footer to the hub page

tests/footer.test.ts

@@ -0,0 +1,17 @@
+import { describe, it, expect, beforeAll } from 'vitest';
+import { execSync } from 'node:child_process';
+import { readFileSync } from 'node:fs';
+
+describe('footer', () => {
+  beforeAll(() => {
+    execSync('npm run build', { stdio: 'inherit' });
+  });
+
+  it('renders the current year and brand name on both locales', () => {
+    const en = readFileSync('dist/en/index.html', 'utf-8');
+    const fr = readFileSync('dist/fr/index.html', 'utf-8');
+    const yearPattern = /©\s*\d{4}\s*Ombrora/;
+    expect(en).toMatch(yearPattern);
+    expect(fr).toMatch(yearPattern);
+  });
+});