feat: enhance RequestsSection layout and add full-screen avatar viewer in ProfileScreen

app/src/main/java/com/rosetta/messenger/ui/components/BlurredAvatarBackground.kt

@@ -77,20 +77,28 @@ fun BoxScope.BlurredAvatarBackground(
     val avatars by avatarRepository?.getAvatars(publicKey, allDecode = false)?.collectAsState()
         ?: remember { mutableStateOf(emptyList()) }
 
-    var originalBitmap by remember(avatars) { mutableStateOf<Bitmap?>(null) }
-    var blurredBitmap by remember(avatars) { mutableStateOf<Bitmap?>(null) }
+    // Stable key based on content, not list reference — prevents bitmap reset during recomposition
+    val avatarKey = remember(avatars) {
+        avatars.firstOrNull()?.timestamp ?: 0L
+    }
 
-    LaunchedEffect(avatars) {
-        if (avatars.isNotEmpty()) {
-            originalBitmap = withContext(Dispatchers.IO) {
-                AvatarFileManager.base64ToBitmap(avatars.first().base64Data)
+    // Don't reset bitmap to null when key changes — keep showing old blur until new one is ready
+    var originalBitmap by remember { mutableStateOf<Bitmap?>(null) }
+    var blurredBitmap by remember { mutableStateOf<Bitmap?>(null) }
+
+    LaunchedEffect(avatarKey) {
+        val currentAvatars = avatars
+        if (currentAvatars.isNotEmpty()) {
+            val newOriginal = withContext(Dispatchers.IO) {
+                AvatarFileManager.base64ToBitmap(currentAvatars.first().base64Data)
             }
-            originalBitmap?.let { bitmap ->
+            if (newOriginal != null) {
+                originalBitmap = newOriginal
                 blurredBitmap = withContext(Dispatchers.Default) {
                     val scaledBitmap = Bitmap.createScaledBitmap(
-                        bitmap,
-                        bitmap.width / 4,
-                        bitmap.height / 4,
+                        newOriginal,
+                        newOriginal.width / 4,
+                        newOriginal.height / 4,
                         true
                     )
                     var result = scaledBitmap