Initial LinkLog implementation

frontend/static/login.js

@@ -0,0 +1,24 @@
+const form = document.querySelector('#login-form');
+const status = document.querySelector('#login-status');
+
+form.addEventListener('submit', async (event) => {
+  event.preventDefault();
+  status.textContent = 'Signing in...';
+  status.style.color = '#334155';
+
+  const response = await fetch('/api/auth/login', {
+    method: 'POST',
+    headers: {'Content-Type': 'application/json'},
+    body: JSON.stringify(Object.fromEntries(new FormData(form))),
+  });
+
+  if (!response.ok) {
+    status.textContent = 'Sign-in failed.';
+    status.style.color = '#b91c1c';
+    return;
+  }
+
+  const data = await response.json();
+  localStorage.setItem('linklogAccessToken', data.access_token);
+  window.location.assign('/profile');
+});