feat: replace bounce marquee with constant-speed ticker

Replaces BounceMarqueeText with TickerText that scrolls at a fixed
33 dp/s regardless of text length. Text scrolls left off-screen with
a container-width gap before looping. Initial 1.5s delay lets the
user read the beginning.

Made-with: Cursor

app/src/main/java/xyz/cottongin/radio247/ui/screens/nowplaying/NowPlayingScreen.kt

@@ -5,7 +5,6 @@ import android.content.res.Configuration
 import android.graphics.BitmapFactory
 import androidx.compose.animation.AnimatedContent
 import androidx.compose.animation.animateColorAsState
-import androidx.compose.animation.core.FastOutSlowInEasing
 import androidx.compose.animation.core.LinearEasing
 import androidx.compose.animation.core.RepeatMode
 import androidx.compose.animation.core.animateFloat
@@ -447,12 +446,13 @@ private fun ArtworkImage(
 }
 
 @Composable
-private fun BounceMarqueeText(
+private fun TickerText(
     text: String,
     style: TextStyle,
     color: Color,
     strokeColor: Color? = null,
     strokeWidth: Float = 2f,
+    velocityDpPerSecond: Float = 33f,
     modifier: Modifier = Modifier
 ) {
     val density = LocalDensity.current
@@ -475,25 +475,26 @@ private fun BounceMarqueeText(
 
         if (overflowPx > 0f) {
             key(text) {
-                val scrollMs = ((overflowPx / density.density) * 18f).toInt().coerceIn(2000, 8000)
-                val pauseMs = 1500
-                val totalMs = pauseMs + scrollMs + pauseMs + scrollMs
+                val velocityPxPerMs = with(density) { velocityDpPerSecond.dp.toPx() } / 1000f
+                val totalScrollPx = textWidthPx + containerWidthPx
+                val scrollMs = (totalScrollPx / velocityPxPerMs).toInt()
+                val initialDelayMs = 1500
+                val durationMs = initialDelayMs + scrollMs
 
-                val transition = rememberInfiniteTransition(label = "marquee")
+                val transition = rememberInfiniteTransition(label = "ticker")
                 val offset by transition.animateFloat(
                     initialValue = 0f,
                     targetValue = 0f,
                     animationSpec = infiniteRepeatable(
                         animation = keyframes {
-                            durationMillis = totalMs
+                            durationMillis = durationMs
                             0f at 0 using LinearEasing
-                            0f at pauseMs using FastOutSlowInEasing
-                            -overflowPx at (pauseMs + scrollMs) using LinearEasing
-                            -overflowPx at (pauseMs + scrollMs + pauseMs) using FastOutSlowInEasing
+                            0f at initialDelayMs using LinearEasing
+                            -totalScrollPx at durationMs using LinearEasing
                         },
                         repeatMode = RepeatMode.Restart
                     ),
-                    label = "bounce"
+                    label = "ticker"
                 )
 
                 Box(
@@ -575,7 +576,7 @@ private fun TrackInfoSection(
             overflow = TextOverflow.Ellipsis
         )
         Spacer(modifier = Modifier.height(6.dp))
-        BounceMarqueeText(
+        TickerText(
             text = trackText,
             style = trackStyle,
             color = trackColor,