feat(web): mobile-responsive redesign with Library view and design tokens

Add mobile layout (mini player, bottom tab bar, responsive navbar), new
Library view, redesigned bot dropdown with action buttons, and centralize
colors/typography/shadows into CSS variables in variables.scss.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

web/src/App.vue

@@ -5,32 +5,87 @@
       <RouterView />
     </main>
     <Player />
+
+    <!-- Mobile mini player -->
+    <div v-if="currentSong" class="m-player" @click="router.push('/lyrics')">
+      <div class="m-player-progress">
+        <div class="m-player-progress-fill" :style="{ width: mobileProgressPct + '%' }" />
+      </div>
+      <CoverArt :url="currentSong.coverUrl" :size="40" :radius="8" />
+      <div class="m-player-info">
+        <div class="m-player-name">{{ currentSong.name }}</div>
+        <div class="m-player-artist">{{ currentSong.artist }}</div>
+      </div>
+      <button class="m-player-btn" @click.stop="playerStore.isPlaying ? playerStore.pause() : playerStore.resume()">
+        <Icon :icon="playerStore.isPlaying ? 'mdi:pause' : 'mdi:play'" />
+      </button>
+      <button class="m-player-btn" @click.stop="playerStore.next()">
+        <Icon icon="mdi:skip-next" />
+      </button>
+    </div>
+
+    <!-- Mobile bottom tab bar -->
+    <nav class="m-tabbar">
+      <RouterLink to="/" class="m-tab" :class="{ active: route.path === '/' }">
+        <Icon icon="mdi:home" class="tab-icon" />
+        <span class="tab-label">发现</span>
+      </RouterLink>
+      <RouterLink to="/search" class="m-tab" :class="{ active: route.path === '/search' }">
+        <Icon icon="mdi:magnify" class="tab-icon" />
+        <span class="tab-label">搜索</span>
+      </RouterLink>
+      <RouterLink to="/library" class="m-tab" :class="{ active: route.path === '/library' }">
+        <Icon icon="mdi:music-box-multiple" class="tab-icon" />
+        <span class="tab-label">音乐库</span>
+      </RouterLink>
+      <RouterLink to="/settings" class="m-tab" :class="{ active: route.path.startsWith('/settings') }">
+        <Icon icon="mdi:cog" class="tab-icon" />
+        <span class="tab-label">设置</span>
+      </RouterLink>
+    </nav>
   </div>
 </template>
 
 <script setup lang="ts">
-import { computed, onMounted, onUnmounted } from 'vue';
+import { computed, onMounted, onUnmounted, ref } from 'vue';
+import { useRoute, useRouter } from 'vue-router';
+import { Icon } from '@iconify/vue';
 import { usePlayerStore } from './stores/player.js';
 import { useWebSocket } from './composables/useWebSocket.js';
 import Navbar from './components/Navbar.vue';
 import Player from './components/Player.vue';
+import CoverArt from './components/CoverArt.vue';
 
 const playerStore = usePlayerStore();
 const theme = computed(() => playerStore.theme);
+const route = useRoute();
+const router = useRouter();
 const { connect } = useWebSocket();
+const currentSong = computed(() => playerStore.currentSong);
 
+const mobileProgressPct = ref(0);
 let syncTimer: ReturnType<typeof setInterval> | null = null;
+let mobileRaf: number | null = null;
+
+function updateMobileProgress() {
+  const duration = currentSong.value?.duration ?? 0;
+  mobileProgressPct.value = duration > 0
+    ? Math.min((playerStore.elapsed / duration) * 100, 100)
+    : 0;
+  mobileRaf = requestAnimationFrame(updateMobileProgress);
+}
 
 onMounted(() => {
   playerStore.loadTheme();
   connect();
   playerStore.fetchBots();
-  // Periodically sync elapsed time from server (ground truth)
   syncTimer = setInterval(() => playerStore.syncElapsed(), 3000);
+  mobileRaf = requestAnimationFrame(updateMobileProgress);
 });
 
 onUnmounted(() => {
   if (syncTimer) clearInterval(syncTimer);
+  if (mobileRaf !== null) cancelAnimationFrame(mobileRaf);
 });
 </script>
 
@@ -47,5 +102,123 @@ onUnmounted(() => {
   @media (max-width: 1336px) {
     padding: 80px 5vw 80px;
   }
+
+  @media (max-width: 768px) {
+    padding: 72px 16px 200px;
+  }
+}
+
+// Mobile mini player
+.m-player {
+  position: fixed;
+  left: 8px;
+  right: 8px;
+  bottom: 68px;
+  height: 58px;
+  padding: 8px 10px;
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  background: var(--bg-secondary);
+  border-radius: var(--radius-md);
+  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.35);
+  z-index: 95;
+  cursor: pointer;
+
+  @media (min-width: 769px) {
+    display: none;
+  }
+}
+
+.m-player-progress {
+  position: absolute;
+  top: 0;
+  left: 10px;
+  right: 10px;
+  height: 2px;
+}
+
+.m-player-progress-fill {
+  height: 2px;
+  background: var(--color-primary);
+  border-radius: 1px;
+}
+
+.m-player-info {
+  flex: 1;
+  min-width: 0;
+}
+
+.m-player-name {
+  font-size: 13px;
+  font-weight: 500;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.m-player-artist {
+  font-size: 11px;
+  color: var(--text-secondary);
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.m-player-btn {
+  width: 32px;
+  height: 32px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 22px;
+  opacity: 0.85;
+  flex-shrink: 0;
+}
+
+// Mobile bottom tab bar
+.m-tabbar {
+  position: fixed;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  height: 60px;
+  display: flex;
+  align-items: center;
+  justify-content: space-around;
+  padding-bottom: env(safe-area-inset-bottom, 0);
+  background: var(--bg-navbar);
+  backdrop-filter: saturate(180%) blur(20px);
+  -webkit-backdrop-filter: saturate(180%) blur(20px);
+  border-top: 1px solid var(--border-color);
+  z-index: 100;
+
+  @media (min-width: 769px) {
+    display: none;
+  }
+}
+
+.m-tab {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 2px;
+  padding: 6px 14px;
+  color: var(--text-tertiary);
+  text-decoration: none;
+  font-family: inherit;
+
+  &.active {
+    color: var(--color-primary);
+  }
+
+  .tab-icon {
+    font-size: 22px;
+  }
+
+  .tab-label {
+    font-size: 10px;
+    font-weight: 500;
+  }
 }
 </style>