A bit of JS to improve the UX slightly... More tests. Everything is kosher now.

tests/unit/copyright-year.test.ts

@@ -0,0 +1,44 @@
+/**
+ * @vitest-environment jsdom
+ */
+import { readFileSync } from 'node:fs';
+import { dirname, join } from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { afterEach, beforeEach, describe, expect, it } from 'vitest';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const SCRIPT_PATH = join(__dirname, '../../static/assets/js/copyright-year.js');
+
+describe('copyright-year.js', () => {
+    let el: HTMLSpanElement;
+
+    beforeEach(() => {
+        el = document.createElement('span');
+        el.id = 'copyright-year';
+        el.textContent = 'placeholder';
+        document.body.appendChild(el);
+    });
+
+    afterEach(() => {
+        el.remove();
+    });
+
+    it('sets #copyright-year textContent to current year when element exists', () => {
+        const code = readFileSync(SCRIPT_PATH, 'utf8');
+         
+        eval(code);
+
+        const expected = new Date().getFullYear().toString();
+        expect(el.textContent).toBe(expected);
+    });
+
+    it('does not throw when #copyright-year is missing', () => {
+        el.remove();
+        const code = readFileSync(SCRIPT_PATH, 'utf8');
+
+        expect(() => {
+             
+            eval(code);
+        }).not.toThrow();
+    });
+});