feat: apply standard login page design

frontend/src/App.vue

@@ -1511,13 +1511,15 @@ onUnmounted(() => {
 <template>
   <div v-if="!authReady" class="center loading-brand"><img class="loading-logo" src="/dodo-logo.svg" alt=""><span class="loader" /><span>正在打开 dodo…</span></div>
   <div v-else-if="!authenticated" class="auth-shell">
-    <section class="auth-card">
-      <div class="brand brand-lockup"><img class="brand-logo" src="/dodo-logo.svg" alt=""><span class="brand-wordmark">dodo</span></div><p>{{ initialized ? '欢迎回来，继续把生活理顺。' : '创建你的 dodo' }}</p>
+    <form class="auth-card" aria-labelledby="auth-title" @submit.prevent="submitAuth">
+      <div class="auth-brand"><div class="brand brand-lockup"><img class="brand-logo" src="/dodo-logo.svg" alt=""><span class="brand-wordmark">dodo</span></div></div>
+      <div class="auth-heading"><h1 id="auth-title">{{ initialized ? '欢迎回来' : '创建你的 dodo' }}</h1><p>{{ initialized ? '登录后继续处理今天的事项。' : '创建账号后开始整理你的事项。' }}</p></div>
       <label>用户名<input v-model="username" autocomplete="username" placeholder="你的用户名"></label>
-      <label>密码<input v-model="password" type="password" autocomplete="current-password" placeholder="至少 12 位" @keyup.enter="submitAuth"></label>
-      <button class="primary" @click="submitAuth">{{ initialized ? '登录' : '开始使用' }}</button>
+      <label>密码<input v-model="password" type="password" autocomplete="current-password" placeholder="至少 12 位"></label>
+      <button type="submit" class="primary">{{ initialized ? '登录' : '开始使用' }}</button>
       <small v-if="error" role="alert">{{ error }}</small>
-    </section>
+      <p v-if="initialized" class="auth-footnote">登录后继续你的清单</p>
+    </form>
   </div>
   <div v-else class="shell" :class="{ 'today-active': activeView==='today', 'sidebar-collapsed': sidebarCollapsed, 'detail-open': Boolean(selectedTask), 'memo-detail-open': activeView==='memos' && memoDetailOpen, 'mobile-sidebar-open': mobileSidebar }">
     <div v-if="mobileSidebar || mobileDetail" class="scrim" @click="mobileSidebar=false;mobileDetail=false" />

frontend/src/style.test.ts

@@ -481,7 +481,27 @@ describe('completion feedback motion', () => {
     expect(css).toContain('@media(prefers-reduced-motion:reduce){.task-row.just-completed,.habit-row.just-completed,.task-row.just-completed .task-check-mark,.habit-row.just-completed .task-check-mark{animation:none}.task-row.completion-exiting,.habit-row.completion-exiting{animation:none}}')
   })
 
-  it('syncs the browser IANA timezone before loading user task data', () => {
+  it('stacks the desktop calendar copy to align with weather and gold', () => {
+    expect(css).toContain('@media(min-width:721px){.today-environment__calendar{flex-direction:column;align-items:flex-start;gap:0}.today-environment__calendar small{margin-top:2px;font-size:10.5px}}')
+  })
+
+  it('uses the approved internal-standard login composition and material tokens', () => {
+    expect(app).toContain('class="auth-brand"')
+    expect(app).toContain('class="brand brand-lockup"')
+    expect(app).toContain('<h1 id="auth-title">{{ initialized ? \'欢迎回来\' : \'创建你的 dodo\' }}</h1>')
+    expect(app).toContain("{{ initialized ? '登录后继续处理今天的事项。' : '创建账号后开始整理你的事项。' }}")
+    expect(app).toContain('<p v-if="initialized" class="auth-footnote">登录后继续你的清单</p>')
+    expect(app).toContain('<form class="auth-card" aria-labelledby="auth-title" @submit.prevent="submitAuth">')
+    expect(app).toContain('<button type="submit" class="primary">')
+    expect(css).toMatch(/\.auth-card\{[^}]*width:min\(400px,100%\)[^}]*padding:36px[^}]*border:1px solid var\(--border-cream\)[^}]*border-radius:var\(--radius-card\)/)
+    expect(css).toContain('.auth-brand .brand{gap:9px;font-size:28px;letter-spacing:-2px}')
+    expect(css).toContain('.auth-brand .brand-logo{width:34px;height:34px}')
+    expect(css).toMatch(/\.auth-card input\{[^}]*min-height:46px[^}]*background:var\(--surface-raised\)/)
+    expect(css).toContain('.auth-card>.primary{min-height:46px}')
+    expect(css).toMatch(/@media\(max-width:930px\)\{\.auth-shell\{padding:18px\}\.auth-card\{padding:30px 24px\}/)
+  })
+
+  it('syncs browser IANA timezone before loading user task data', () => {
     expect(app).toContain("Intl.DateTimeFormat().resolvedOptions().timeZone")
     expect(app).toContain("await api('/me', { method: 'PATCH', body: JSON.stringify({ timezone }) })")
     const bootstrapBlock = app.slice(app.indexOf('async function bootstrap()'), app.indexOf('async function submitAuth()'))