feat(ui): swipe-down to dismiss the mini-player

- verticalDragToDismiss: bar follows the finger downward
  (translationY, capped 120dp) and dismisses past 40% height or on a
  downward fling; springs back otherwise; static under Reduce Motion
- Dismissal is per-source: playback continues, and the bar returns
  automatically when a different station/song starts
- Tabs route now owns its mini-player (root no longer stacks one)
- On-device: swipe dismissed bar while PLAYING; station change
  re-showed it

app/src/main/java/com/rada/ui/navigation/NavGraph.kt

@@ -29,7 +29,7 @@ import com.rada.ui.streams.StreamsScreen
 fun NavGraph(navController: NavHostController) {
     val navBackStackEntry by navController.currentBackStackEntryAsState()
     val currentRoute = navBackStackEntry?.destination?.route
-    val showNowPlayingBar = currentRoute != Screen.Player.route
+    val showNowPlayingBar = currentRoute != Screen.Player.route && currentRoute != Screen.Tabs.route
     val reduce = LocalReduceMotion.current
 
     Column(modifier = Modifier.fillMaxSize()) {

app/src/main/java/com/rada/ui/player/NowPlayingBar.kt

@@ -8,6 +8,7 @@ import com.rada.ui.theme.metadataEnter
 import com.rada.ui.theme.metadataExit
 import com.rada.ui.theme.LocalReduceMotion
 import com.rada.ui.theme.barEnter
+import com.rada.ui.theme.verticalDragToDismiss
 import com.rada.ui.theme.barExit
 import androidx.compose.foundation.background
 import androidx.compose.foundation.border
@@ -36,6 +37,8 @@ import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
@@ -62,7 +65,12 @@ fun NowPlayingBar(
     val isLocal by viewModel.isLocal.collectAsState()
     val streamMeta by viewModel.streamMeta.collectAsState()
     val localMedia by viewModel.localMedia.collectAsState()
-    val isVisible = stationName.isNotEmpty()
+    // Swipe-down (or quick drag-down) dismisses the bar until a *new*
+    // source starts playing — a floating thing should answer to gestures.
+    var dismissedFor by remember { mutableStateOf<String?>(null) }
+    val sourceKey = stationName
+    if (dismissedFor != null && dismissedFor != sourceKey) dismissedFor = null
+    val isVisible = stationName.isNotEmpty() && dismissedFor != sourceKey
 
     // Spotify-style two-line bar: track (or station) + artist (or station).
     val title: String
@@ -93,6 +101,10 @@ fun NowPlayingBar(
         Column(
             modifier = Modifier
                 .fillMaxWidth()
+                .verticalDragToDismiss(
+                    thresholdFraction = 0.4f,
+                    onDismiss = { dismissedFor = sourceKey },
+                )
                 .padding(horizontal = 12.dp)
                 .clip(RoundedCornerShape(SatsAmpGlass.rCard))
                 // glass: textSafe 90% overlay + 6% white + highlight border

app/src/main/java/com/rada/ui/theme/Motion.kt

@@ -1,5 +1,6 @@
 package com.rada.ui.theme
 
+import androidx.compose.ui.unit.dp
 import androidx.compose.animation.core.animateFloatAsState
 import androidx.compose.foundation.interaction.MutableInteractionSource
 import androidx.compose.foundation.interaction.collectIsPressedAsState
@@ -8,6 +9,10 @@ import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.composed
 import androidx.compose.ui.graphics.graphicsLayer
+import androidx.compose.foundation.gestures.detectVerticalDragGestures
+import androidx.compose.runtime.mutableFloatStateOf
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.animation.EnterTransition
 import androidx.compose.animation.ExitTransition
 import androidx.compose.animation.core.CubicBezierEasing
@@ -142,3 +147,35 @@ fun Modifier.pressDip(
     )
     this.graphicsLayer { scaleX = scale; scaleY = scale }
 }
+
+// ── Dismiss-by-drag ───────────────────────────────────────────────────────
+// A floating bar should answer to a downward drag: it follows the finger
+// (translationY only) and dismisses past a threshold or on a downward fling;
+// otherwise it springs back. Reduce Motion: no follow, threshold-only dismiss.
+
+fun Modifier.verticalDragToDismiss(
+    thresholdFraction: Float = 0.5f,
+    onDismiss: () -> Unit,
+): Modifier = composed {
+    val reduce = LocalReduceMotion.current
+    var dragPx by remember { mutableFloatStateOf(0f) }
+    val density = androidx.compose.ui.platform.LocalDensity.current
+    val maxDrag = with(density) { 120.dp.toPx() }
+    this
+        .graphicsLayer { translationY = if (reduce) 0f else dragPx }
+        .pointerInput(Unit) {
+            detectVerticalDragGestures(
+                onDragEnd = {
+                    if (dragPx > size.height * thresholdFraction) onDismiss()
+                    dragPx = 0f
+                },
+                onDragCancel = { dragPx = 0f },
+                onVerticalDrag = { change, amount ->
+                    if (amount > 0) {
+                        change.consume()
+                        dragPx = (dragPx + amount).coerceIn(0f, maxDrag)
+                    }
+                },
+            )
+        }
+}