fix(ui): 批量替换所有组件中残留的硬编码深色值以彻底支持浅色主题

app/components/UI/LyricsModal.vue

@@ -1136,7 +1136,7 @@ onUnmounted(() => {
 .default-cover {
   width: 100%;
   height: 100%;
-  background: linear-gradient(135deg, #333, #555);
+  background: linear-gradient(135deg, var(--bg-quaternary, #333333), #555);
   display: flex;
   align-items: center;
   justify-content: center;
@@ -1152,7 +1152,7 @@ onUnmounted(() => {
   font-size: 2.2rem;
   font-weight: 700;
   margin: 0 0 0.5rem 0;
-  color: #ffffff;
+  color: var(--text-primary, #ffffff);
   line-height: 1.2;
   letter-spacing: -0.02em;
   white-space: normal;
@@ -1246,7 +1246,7 @@ onUnmounted(() => {
 
 .progress-fill {
   height: 100%;
-  background: #ffffff;
+  background: var(--card-bg, #ffffff);
   border-radius: 3px;
   pointer-events: none;
 }
@@ -1256,7 +1256,7 @@ onUnmounted(() => {
   top: 50%;
   width: 14px;
   height: 14px;
-  background: #ffffff;
+  background: var(--card-bg, #ffffff);
   border-radius: 50%;
   transform: translate(-50%, -50%) scale(0);
   transition: transform 0.1s ease;
@@ -1306,7 +1306,7 @@ onUnmounted(() => {
 
 .secondary-btn.active {
   opacity: 1;
-  color: #ffffff;
+  color: var(--text-primary, #ffffff);
   text-shadow: 0 0 8px rgba(255, 255, 255, 0.4);
 }
 
@@ -1472,7 +1472,7 @@ onUnmounted(() => {
   width: 100%;
   text-align: center;
   background: transparent;
-  color: #333; /* 深色文字 */
+  color: var(--text-quaternary, #333333); /* 深色文字 */
   padding: 8px 12px; /* 减小内边距 */
   border-radius: 8px;
   font-size: 0.85rem; /* 稍微减小字体 */
@@ -1490,7 +1490,7 @@ onUnmounted(() => {
 
 .badge-quality-option.active {
   color: #007aff; /* 蓝色字 */
-  background: #ffffff;
+  background: var(--card-bg, #ffffff);
   font-weight: 600;
   box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
 }
@@ -1522,7 +1522,7 @@ onUnmounted(() => {
   width: 20px;
   height: 5px;
   border-radius: 3px;
-  background: #ffffff;
+  background: var(--card-bg, #ffffff);
   box-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
 }
 
@@ -1759,7 +1759,7 @@ onUnmounted(() => {
   }
 
   .progress-fill {
-    background: #ffffff;
+    background: var(--card-bg, #ffffff);
   }
 
   .progress-thumb {