feat(profile): set a display name and greet with it on the dashboard

Settings: new Profil card with display name and Steam ID. Registration: optional display name. The dashboard falls back to the email prefix when no display name is set.

src/utils/validation.test.js

@@ -28,3 +28,20 @@ describe('steamId validation', () => {
         expect(result.steamId).toBe('76561198005679788');
     });
 });
+
+describe('displayName validation', () => {
+    const withName = (displayName) => ({...settings('76561198005679788'), displayName});
+
+    it('turns an empty field into null (no display name)', () => {
+        expect(settingsSchema.parse(withName('  ')).displayName).toBeNull();
+    });
+
+    it('trims and keeps a valid name', () => {
+        expect(settingsSchema.parse(withName(' Lobo Corp_1 ')).displayName).toBe('Lobo Corp_1');
+    });
+
+    it.each(['ab', '<script>', 'a'.repeat(25)])('rejects %j', (displayName) => {
+        expect(settingsSchema.safeParse(withName(displayName)).success).toBe(false);
+    });
+});
+