Migrate Slider to the SliderState API

material3 1.5.0-alpha28 removed the value-based Slider overload that accepts custom thumb and track.
Keep the public signature of our wrapper and remember a SliderState internally,
as the deprecated material3 overload does.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/theme/components/Slider.kt

@@ -18,6 +18,7 @@ import androidx.compose.foundation.layout.height
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.SliderColors
 import androidx.compose.material3.SliderDefaults
+import androidx.compose.material3.SliderState
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
@@ -60,16 +61,16 @@ fun Slider(
             }
         }
     }
+    val sliderState = remember(steps, valueRange) { SliderState(value = value, steps = steps, trackRange = valueRange) }
+    sliderState.value = value
     androidx.compose.material3.Slider(
-        value = value,
+        state = sliderState,
         onValueChange = onValueChange,
         modifier = modifier,
         enabled = enabled,
-        valueRange = valueRange,
-        steps = steps,
         onValueChangeFinished = onValueChangeFinish,
         colors = colors,
-        thumb = {
+        thumb = { _ ->
             if (useCustomLayout) {
                 SliderDefaults.Thumb(
                     modifier = Modifier.drawWithContent {