add admin login page at /login

frontend/rabbi_gerzi/src/views/LoginPage.vue

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+<script setup lang="ts">
+import { ref } from 'vue'
+import { useRouter } from 'vue-router'
+import { useAuthStore } from '@/stores/auth'
+
+const router = useRouter()
+const authStore = useAuthStore()
+
+const email = ref('')
+const password = ref('')
+
+async function handleSubmit(): Promise<void> {
+  const success = await authStore.login(email.value, password.value)
+  if (success) {
+    router.push('/')
+  }
+}
+</script>
+
+<template>
+  <div class="login-page">
+    <div class="login-card">
+      <h1 class="login-card__title">Admin Login</h1>
+
+      <form class="login-card__form" @submit.prevent="handleSubmit">
+        <label class="login-card__field">
+          <span class="login-card__label">Email</span>
+          <input
+            v-model="email"
+            data-cy="login-email"
+            type="email"
+            class="login-card__input"
+            autocomplete="email"
+          />
+        </label>
+
+        <label class="login-card__field">
+          <span class="login-card__label">Password</span>
+          <input
+            v-model="password"
+            data-cy="login-password"
+            type="password"
+            class="login-card__input"
+            autocomplete="current-password"
+          />
+        </label>
+
+        <p v-if="authStore.loginError" data-cy="login-error" class="login-card__error">
+          {{ authStore.loginError }}
+        </p>
+
+        <button
+          data-cy="login-submit"
+          type="submit"
+          class="login-card__submit"
+          :disabled="authStore.isSubmitting"
+        >
+          {{ authStore.isSubmitting ? 'Signing in...' : 'Sign In' }}
+        </button>
+      </form>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.login-page {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  min-height: 100vh;
+  background: var(--color-cream);
+  padding: 1rem;
+}
+
+.login-card {
+  background: var(--color-white);
+  border: 1px solid var(--color-border);
+  border-radius: 8px;
+  padding: 2.5rem;
+  width: 100%;
+  max-width: 400px;
+}
+
+.login-card__title {
+  font-family: var(--font-serif);
+  font-size: 1.5rem;
+  color: var(--color-slate);
+  text-align: center;
+  margin: 0 0 1.5rem;
+}
+
+.login-card__form {
+  display: flex;
+  flex-direction: column;
+  gap: 1rem;
+}
+
+.login-card__field {
+  display: flex;
+  flex-direction: column;
+  gap: 0.25rem;
+}
+
+.login-card__label {
+  font-size: 0.875rem;
+  color: var(--color-text-muted);
+}
+
+.login-card__input {
+  padding: 0.625rem 0.75rem;
+  border: 1px solid var(--color-border);
+  border-radius: 4px;
+  font-family: var(--font-sans);
+  font-size: 0.9375rem;
+  color: var(--color-text);
+  background: var(--color-white);
+  outline: none;
+  transition: border-color 0.15s ease;
+}
+
+.login-card__input:focus {
+  border-color: var(--color-olive);
+}
+
+.login-card__error {
+  font-size: 0.875rem;
+  color: #b33;
+  margin: 0;
+  padding: 0.5rem 0.75rem;
+  background: #fef2f2;
+  border: 1px solid #fecaca;
+  border-radius: 4px;
+}
+
+.login-card__submit {
+  padding: 0.75rem 1rem;
+  background: var(--color-olive);
+  color: var(--color-white);
+  font-family: var(--font-sans);
+  font-size: 0.9375rem;
+  font-weight: 500;
+  border: none;
+  border-radius: 4px;
+  cursor: pointer;
+  transition: background 0.15s ease;
+  margin-top: 0.5rem;
+}
+
+.login-card__submit:hover:not(:disabled) {
+  background: var(--color-slate);
+}
+
+.login-card__submit:disabled {
+  opacity: 0.6;
+  cursor: not-allowed;
+}
+</style>