feat(queue): unified persistent queue list with playing indicator

Show all queue entries (played and upcoming) in one list instead of
splitting into a "Now playing" card + "Next up" tail, so previously
played tracks don't disappear and reappear when navigating back/forward.
The current track is outlined and shows a reusable "hopping bars"
PlayingIndicator (modern-sk style equalizer animation) for future reuse
across track lists.

src/styles/shell.css

@@ -404,6 +404,47 @@
   font-size: 10px;
 }
 
+/* ---- playing indicator ("hopping bars" equalizer, YTM-style) ---- */
+.playing-bars {
+  display: inline-flex;
+  align-items: flex-end;
+  justify-content: center;
+  gap: 2px;
+  width: 14px;
+  height: 14px;
+  flex-shrink: 0;
+}
+.playing-bars span {
+  display: block;
+  width: 3px;
+  background: var(--lime);
+  border-radius: 1px;
+  height: 30%;
+  animation: playing-bar-bounce 1s ease-in-out infinite;
+}
+.playing-bars span:nth-child(1) {
+  animation-delay: -0.9s;
+}
+.playing-bars span:nth-child(2) {
+  animation-delay: -0.3s;
+}
+.playing-bars span:nth-child(3) {
+  animation-delay: -0.6s;
+}
+.playing-bars.paused span {
+  animation-play-state: paused;
+  height: 100%;
+}
+@keyframes playing-bar-bounce {
+  0%,
+  100% {
+    height: 30%;
+  }
+  50% {
+    height: 100%;
+  }
+}
+
 /* ============================================================
    PLAYER BAR
    ============================================================ */
@@ -604,36 +645,6 @@
   overflow-y: auto;
   padding: 12px 12px 18px;
 }
-.qd-now {
-  display: flex;
-  gap: 11px;
-  align-items: center;
-  padding: 10px;
-  border-radius: var(--r-md);
-  background: linear-gradient(
-    180deg,
-    rgba(190, 242, 100, 0.13),
-    rgba(190, 242, 100, 0.05)
-  );
-  border: 1px solid rgba(190, 242, 100, 0.2);
-  margin-bottom: 14px;
-}
-.qd-now .qt {
-  min-width: 0;
-  flex: 1;
-}
-.qd-now .qt .t {
-  font-size: 13px;
-  font-weight: 600;
-  color: var(--fg-1);
-  white-space: nowrap;
-  overflow: hidden;
-  text-overflow: ellipsis;
-}
-.qd-now .qt .r {
-  font-size: 11px;
-  color: var(--fg-3);
-}
 .qrow {
   display: flex;
   gap: 11px;
@@ -649,6 +660,18 @@
 .qrow:hover {
   background: rgba(255, 255, 255, 0.04);
 }
+.qrow.current {
+  background: linear-gradient(
+    180deg,
+    rgba(190, 242, 100, 0.13),
+    rgba(190, 242, 100, 0.05)
+  );
+  box-shadow: 0 0 0 1px rgba(190, 242, 100, 0.35) inset;
+}
+.qrow.current .qt .t {
+  color: var(--lime);
+  font-weight: 600;
+}
 .qrow .grip {
   color: var(--fg-3);
   font-size: 15px;