android/app/src/main/java/com/fabledsword/minstrel/player/ui/MiniPlayer.kt

@@ -20,8 +20,7 @@ import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.Slider
-import androidx.compose.material3.SliderDefaults
+import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
@@ -148,10 +147,19 @@ fun MiniPlayer(
         tonalElevation = MINI_BAR_TONAL_ELEVATION_DP.dp,
     ) {
         Column {
-            MiniSeekBar(
+            // Non-interactive fill bar — no scrubber thumb. Tapping
+            // the bar still expands to NowPlaying where scrubbing
+            // lives. The displayed fraction interpolates per-frame
+            // between PlayerController position ticks so the fill
+            // glides instead of stepping every 500ms.
+            val smoothPositionMs by rememberSmoothPositionMs(
                 positionMs = state.positionMs,
                 durationMs = state.durationMs,
-                onSeek = viewModel::seekTo,
+                isPlaying = state.isPlaying,
+            )
+            MiniProgressFill(
+                positionMs = smoothPositionMs,
+                durationMs = state.durationMs,
             )
             MiniRow(
                 track = track,
@@ -170,27 +178,25 @@ fun MiniPlayer(
 }
 
 @Composable
-private fun MiniSeekBar(positionMs: Long, durationMs: Long, onSeek: (Long) -> Unit) {
+private fun MiniProgressFill(positionMs: Long, durationMs: Long) {
     val fraction = if (durationMs > 0) {
         (positionMs.toFloat() / durationMs.toFloat()).coerceIn(0f, 1f)
     } else {
         0f
     }
-    Slider(
-        value = fraction,
-        onValueChange = { v -> if (durationMs > 0) onSeek((v * durationMs).toLong()) },
+    Box(
         modifier = Modifier
             .fillMaxWidth()
-            .height(SCRUBBER_ROW_HEIGHT_DP.dp),
-        colors = SliderDefaults.colors(
-            thumbColor = MaterialTheme.colorScheme.primary,
-            activeTrackColor = MaterialTheme.colorScheme.primary,
-            // M3 default inactiveTrackColor is secondaryContainer, which the
-            // theme doesn't override — that's where the M3-baseline purple
-            // leaks in. Pin to surfaceVariant (= slate) for Flutter parity.
-            inactiveTrackColor = MaterialTheme.colorScheme.surfaceVariant,
-        ),
-    )
+            .height(SCRUBBER_ROW_HEIGHT_DP.dp)
+            .background(MaterialTheme.colorScheme.surfaceVariant),
+    ) {
+        Box(
+            modifier = Modifier
+                .fillMaxHeight()
+                .fillMaxWidth(fraction)
+                .background(MaterialTheme.colorScheme.primary),
+        )
+    }
 }
 
 @Composable

android/app/src/main/java/com/fabledsword/minstrel/player/ui/NowPlayingScreen.kt

@@ -28,10 +28,12 @@ import androidx.compose.ui.input.nestedscroll.NestedScrollSource
 import androidx.compose.ui.input.nestedscroll.nestedScroll
 import androidx.compose.ui.unit.Velocity
 import androidx.compose.material3.Scaffold
+import androidx.compose.foundation.interaction.MutableInteractionSource
+import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.Slider
+import androidx.compose.ui.unit.DpSize
 import androidx.compose.material3.TopAppBar
 import androidx.compose.material3.TopAppBarDefaults
-import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.ui.graphics.Brush
 import androidx.compose.ui.graphics.Color
 import androidx.compose.material3.SliderDefaults
@@ -271,13 +273,18 @@ private fun NowPlayingBody(
             onToggleShuffle = viewModel::toggleShuffle,
             onCycleRepeat = viewModel::cycleRepeat,
         )
-        Spacer(Modifier.height(8.dp))
-        ScrubberRow(
+        Spacer(Modifier.height(4.dp))
+        val smoothPositionMs by rememberSmoothPositionMs(
             positionMs = state.positionMs,
             durationMs = state.durationMs,
+            isPlaying = state.isPlaying,
+        )
+        ScrubberRow(
+            positionMs = smoothPositionMs,
+            durationMs = state.durationMs,
             onSeek = viewModel::seekTo,
         )
-        Spacer(Modifier.height(8.dp))
+        Spacer(Modifier.height(4.dp))
         TransportRow(
             isPlaying = state.isPlaying,
             onPrev = viewModel::skipToPrevious,
@@ -426,6 +433,7 @@ private fun TrackHeader(title: String, artist: String, album: String) {
     }
 }
 
+@OptIn(ExperimentalMaterial3Api::class)
 @Composable
 private fun ScrubberRow(positionMs: Long, durationMs: Long, onSeek: (Long) -> Unit) {
     val accent = MaterialTheme.colorScheme.primary
@@ -434,19 +442,34 @@ private fun ScrubberRow(positionMs: Long, durationMs: Long, onSeek: (Long) -> Un
     } else {
         0f
     }
+    val interactionSource = remember { MutableInteractionSource() }
+    val sliderColors = SliderDefaults.colors(
+        thumbColor = accent,
+        activeTrackColor = accent,
+        // M3 inactive default is secondaryContainer (purple baseline);
+        // pin to surfaceVariant (= slate) for Flutter parity.
+        inactiveTrackColor = MaterialTheme.colorScheme.surfaceVariant,
+    )
     Slider(
         value = fraction,
         onValueChange = { newFraction ->
             if (durationMs > 0) onSeek((newFraction * durationMs).toLong())
         },
         modifier = Modifier.fillMaxWidth(),
-        colors = SliderDefaults.colors(
-            thumbColor = accent,
-            activeTrackColor = accent,
-            // M3 inactive default is secondaryContainer (purple baseline);
-            // pin to surfaceVariant (= slate) for Flutter parity.
-            inactiveTrackColor = MaterialTheme.colorScheme.surfaceVariant,
-        ),
+        colors = sliderColors,
+        interactionSource = interactionSource,
+        // Slim 10dp thumb shrinks the scrubber's visual weight. M3
+        // default is 20dp; halving keeps it tappable (Slider's own
+        // 48dp hit slop is unchanged) but lets it recede into the UI.
+        // Track left at default — the colour pin alone already
+        // matches Flutter's slate look.
+        thumb = {
+            SliderDefaults.Thumb(
+                interactionSource = interactionSource,
+                colors = sliderColors,
+                thumbSize = DpSize(10.dp, 10.dp),
+            )
+        },
     )
     Row(
         modifier = Modifier.fillMaxWidth(),

android/app/src/main/java/com/fabledsword/minstrel/player/ui/SmoothPosition.kt

@@ -0,0 +1,48 @@
+package com.fabledsword.minstrel.player.ui
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.State
+import androidx.compose.runtime.produceState
+import androidx.compose.runtime.withFrameMillis
+import kotlinx.coroutines.isActive
+
+/**
+ * Per-frame interpolated playhead. `positionMs` comes in at the
+ * polling cadence of [com.fabledsword.minstrel.player.PlayerController]
+ * (~500ms today) — using it directly for the scrubber paints a sudden
+ * 500ms jump on each tick. This wraps it in a [produceState] that
+ * resets to the canonical value on every emission and then advances
+ * forward at 1ms/ms while the player is playing, so the displayed
+ * position moves continuously at the natural playback rate.
+ *
+ * On track end / pause / seek the produceState's keys change and the
+ * coroutine restarts from the new canonical value — so when the
+ * canonical position changes by more than a frame can account for
+ * (skip, scrub, seek), we snap instead of slewing across the bar.
+ *
+ * For paused state the position stays at the canonical value with no
+ * extrapolation; for ended/durationMs<=0 the helper returns
+ * `positionMs` unchanged.
+ */
+@Composable
+fun rememberSmoothPositionMs(
+    positionMs: Long,
+    durationMs: Long,
+    isPlaying: Boolean,
+): State<Long> = produceState(
+    initialValue = positionMs,
+    key1 = positionMs,
+    key2 = isPlaying,
+    key3 = durationMs,
+) {
+    value = positionMs
+    if (!isPlaying || durationMs <= 0L) return@produceState
+    val startFrame = withFrameMillis { it }
+    val startPos = positionMs
+    while (isActive) {
+        withFrameMillis { now ->
+            val advanced = startPos + (now - startFrame)
+            value = advanced.coerceAtMost(durationMs)
+        }
+    }
+}