Fix panel drag release flicker

app/androidApp/src/main/kotlin/com/example/aiapp/SubagentPanel.kt

@@ -1,7 +1,7 @@
 package com.example.aiapp
 
 import androidx.activity.compose.BackHandler
-import androidx.compose.animation.core.animateFloatAsState
+import androidx.compose.animation.core.Animatable
 import androidx.compose.foundation.ExperimentalFoundationApi
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
@@ -73,29 +73,39 @@ fun SubagentPanel(
     onOpenSubagent: (SubagentSummary) -> Unit,
     content: @Composable () -> Unit,
 ) {
+    val scope = rememberCoroutineScope()
     var open by remember(summary.id) { mutableStateOf(false) }
     var dragging by remember(summary.id) { mutableStateOf(false) }
     var draggedReveal by remember(summary.id) { mutableFloatStateOf(0f) }
-    val animatedReveal by animateFloatAsState(if (open) 1f else 0f, label = "subagent panel")
-    val reveal = if (dragging) draggedReveal else animatedReveal
+    val animatedReveal = remember(summary.id) { Animatable(0f) }
+    val reveal = if (dragging) draggedReveal else animatedReveal.value
     val flingThreshold = with(LocalDensity.current) { FLING_THRESHOLD.toPx() }
 
-    fun startDrag() {
-        draggedReveal = reveal
+    suspend fun startDrag() {
+        animatedReveal.stop()
+        draggedReveal = animatedReveal.value
         dragging = true
     }
 
-    fun finishDrag(velocity: Float) {
-        open =
+    suspend fun finishDrag(velocity: Float) {
+        val targetOpen =
             when {
                 velocity < -flingThreshold -> true
                 velocity > flingThreshold -> false
                 else -> draggedReveal >= OPEN_THRESHOLD
             }
+        open = targetOpen
+        animatedReveal.snapTo(draggedReveal)
         dragging = false
+        animatedReveal.animateTo(if (targetOpen) 1f else 0f)
     }
 
-    BackHandler(enabled = open) { open = false }
+    fun setOpen(targetOpen: Boolean) {
+        open = targetOpen
+        scope.launch { animatedReveal.animateTo(if (targetOpen) 1f else 0f) }
+    }
+
+    BackHandler(enabled = open) { setOpen(false) }
 
     BoxWithConstraints(Modifier.fillMaxSize()) {
         val panelWidth = maxWidth * 0.88f
@@ -126,7 +136,7 @@ fun SubagentPanel(
                     .alpha(reveal * 0.32f)
                     .background(MaterialTheme.colorScheme.scrim)
                     .semantics { contentDescription = "Dismiss subagent panel" }
-                    .clickable { open = false }
+                    .clickable { setOpen(false) }
             )
         }
 
@@ -144,7 +154,7 @@ fun SubagentPanel(
                 settings = settings,
                 summary = summary,
                 active = open,
-                onClose = { open = false },
+                onClose = { setOpen(false) },
                 onOpenSubagent = onOpenSubagent,
             )
         }