feat(lyrics): smoother transitions and static lyrics at top

- Reduced transition durations from 300-400ms to 120-150ms
- Changed easing to ease-out for snappier feel
- Added will-change for GPU acceleration
- Non-synced lyrics now display at container top (no spacers)
- Added isSynced prop to all lyrics components

src/lib/components/FocusMode.svelte

@@ -23,6 +23,7 @@
     lyricsLines?: LyricsLine[];
     lyricsActiveIndex?: number;
     lyricsActiveProgress?: number;
+    lyricsSynced?: boolean;
     lyricsLoading?: boolean;
     lyricsError?: string | null;
   }
@@ -43,6 +44,7 @@
     lyricsLines = [],
     lyricsActiveIndex = -1,
     lyricsActiveProgress = 0,
+    lyricsSynced = false,
     lyricsLoading = false,
     lyricsError = null
   }: Props = $props();
@@ -141,6 +143,7 @@
               lines={lyricsLines}
               activeIndex={lyricsActiveIndex}
               activeProgress={lyricsActiveProgress}
+              isSynced={lyricsSynced}
               center={false}
               compact={false}
               immersive={true}

src/lib/components/lyrics/LyricsImmersive.svelte

@@ -9,6 +9,7 @@
     lines: LyricsLine[];
     activeIndex?: number;
     activeProgress?: number;
+    isSynced?: boolean;
     align?: 'left' | 'center';
     title?: string;
     artist?: string;
@@ -19,6 +20,7 @@
     lines,
     activeIndex = -1,
     activeProgress = 0,
+    isSynced = false,
     align = 'center',
     title = '',
     artist = '',
@@ -54,6 +56,7 @@
       {lines}
       {activeIndex}
       {activeProgress}
+      {isSynced}
       center={isCenter}
       compact={false}
     />

src/lib/components/lyrics/LyricsLines.svelte

@@ -14,6 +14,7 @@
     compact?: boolean;
     scrollToActive?: boolean;
     immersive?: boolean;
+    isSynced?: boolean;
   }
 
   let {
@@ -24,7 +25,8 @@
     center = false,
     compact = false,
     scrollToActive = true,
-    immersive = false
+    immersive = false,
+    isSynced = false
   }: Props = $props();
 
   let container: HTMLDivElement | null = null;
@@ -99,18 +101,21 @@
   class:compact
   class:center
   class:immersive
+  class:static={!isSynced}
   bind:this={container}
 >
   {#if lines.length === 0}
     <div class="lyrics-empty">No lyrics available</div>
   {:else}
-    <!-- Spacer at top to allow first lines to scroll to center -->
-    <div class="lyrics-spacer"></div>
+    <!-- Spacer at top to allow first lines to scroll to center (only for synced) -->
+    {#if isSynced}
+      <div class="lyrics-spacer"></div>
+    {/if}
 
     {#each lines as line, index}
-      {@const isActive = index === activeIndex}
-      {@const isPast = index < activeIndex}
-      {@const opacity = getLineOpacity(index, activeIndex)}
+      {@const isActive = isSynced && index === activeIndex}
+      {@const isPast = isSynced && index < activeIndex}
+      {@const opacity = isSynced ? getLineOpacity(index, activeIndex) : 1}
       <div
         class="lyrics-line"
         class:active={isActive}
@@ -122,8 +127,10 @@
       </div>
     {/each}
 
-    <!-- Spacer at bottom to allow last lines to scroll to center -->
-    <div class="lyrics-spacer"></div>
+    <!-- Spacer at bottom to allow last lines to scroll to center (only for synced) -->
+    {#if isSynced}
+      <div class="lyrics-spacer"></div>
+    {/if}
   {/if}
 </div>
 
@@ -135,7 +142,6 @@
     padding: 16px 20px;
     overflow-y: auto;
     height: 100%;
-    scroll-behavior: smooth;
     scrollbar-width: thin;
     scrollbar-color: var(--bg-tertiary) transparent;
   }
@@ -158,6 +164,16 @@
     flex-shrink: 0;
   }
 
+  /* Static mode - non-synced lyrics, start at top */
+  .lyrics-lines.static {
+    justify-content: flex-start;
+  }
+
+  .lyrics-lines.static .lyrics-line {
+    opacity: 0.85;
+    color: var(--text-primary);
+  }
+
   .lyrics-lines.center {
     text-align: center;
   }
@@ -199,12 +215,13 @@
     letter-spacing: 0.01em;
     opacity: var(--line-opacity, 1);
     transition:
-      opacity 400ms cubic-bezier(0.4, 0, 0.2, 1),
-      transform 400ms cubic-bezier(0.4, 0, 0.2, 1),
-      font-size 300ms cubic-bezier(0.4, 0, 0.2, 1),
-      font-weight 300ms cubic-bezier(0.4, 0, 0.2, 1),
-      color 300ms cubic-bezier(0.4, 0, 0.2, 1);
+      opacity 150ms ease-out,
+      transform 150ms ease-out,
+      font-size 120ms ease-out,
+      font-weight 120ms ease-out,
+      color 150ms ease-out;
     transform-origin: left center;
+    will-change: opacity, transform;
   }
 
   .lyrics-lines.center .lyrics-line {

src/lib/components/lyrics/LyricsMini.svelte

@@ -10,6 +10,7 @@
     lines: LyricsLine[];
     activeIndex?: number;
     activeProgress?: number;
+    isSynced?: boolean;
     title?: string;
     artist?: string;
     artwork?: string;
@@ -23,6 +24,7 @@
     lines,
     activeIndex = -1,
     activeProgress = 0,
+    isSynced = false,
     title = '',
     artist = '',
     artwork,
@@ -43,6 +45,7 @@
       {lines}
       {activeIndex}
       {activeProgress}
+      {isSynced}
       compact={true}
       center={false}
     />

src/lib/components/lyrics/LyricsSidebar.svelte

@@ -12,6 +12,7 @@
     lines: LyricsLine[];
     activeIndex?: number;
     activeProgress?: number;
+    isSynced?: boolean;
     isLoading?: boolean;
     error?: string | null;
   }
@@ -22,6 +23,7 @@
     lines,
     activeIndex = -1,
     activeProgress = 0,
+    isSynced = false,
     isLoading = false,
     error = null
   }: Props = $props();
@@ -53,6 +55,7 @@
         {lines}
         {activeIndex}
         {activeProgress}
+        {isSynced}
         compact={true}
         center={false}
       />

src/routes/+page.svelte

@@ -1102,6 +1102,7 @@
         lines={lyricsLines.map(l => ({ text: l.text }))}
         activeIndex={lyricsActiveIndex}
         activeProgress={lyricsActiveProgress}
+        isSynced={lyricsIsSynced}
         isLoading={lyricsStatus === 'loading'}
         error={lyricsStatus === 'error' ? lyricsError : (lyricsStatus === 'not_found' ? 'No lyrics found' : null)}
       />
@@ -1215,6 +1216,7 @@
         lyricsLines={lyricsLines.map(l => ({ text: l.text }))}
         lyricsActiveIndex={lyricsActiveIndex}
         lyricsActiveProgress={lyricsActiveProgress}
+        lyricsSynced={lyricsIsSynced}
         lyricsLoading={lyricsStatus === 'loading'}
         lyricsError={lyricsStatus === 'error' ? lyricsError : (lyricsStatus === 'not_found' ? 'No lyrics found' : null)}
       />