feat: Implement baseline profile generation and startup benchmarking

- Added baseline profile generator for Rosetta Messenger to optimize startup performance.
- Created startup benchmark tests to measure cold start times under different compilation modes.
- Introduced a new Gradle module for baseline profile and benchmark tests.
- Updated ChatsListViewModel to show loading skeleton while data is being fetched.
- Improved keyboard handling in MessageInputBar by using SHOW_IMPLICIT instead of SHOW_FORCED.
- Minor code cleanups and optimizations across various components.

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

@@ -214,7 +214,7 @@ private fun OnlineIndicator(modifier: Modifier = Modifier) {
  */
 @Composable
 fun AvatarPicker(
-    onAvatarSelected: (String) -> Unit
+    @Suppress("UNUSED_PARAMETER") onAvatarSelected: (String) -> Unit
 ) {
     // TODO: Реализовать выбор изображения через ActivityResultContract
     // 1. Использовать rememberLauncherForActivityResult с ActivityResultContracts.GetContent()

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

@@ -129,7 +129,6 @@ object OptimizedEmojiCache {
         isPreloading = true
         
         // Берем первые N эмодзи из категории Smileys (самые популярные)
-        val smileyCategory = EMOJI_CATEGORIES.find { it.key == "Smileys" }
         val smileysToPreload = emojisByCategory?.get("Smileys")
             ?.take(PRELOAD_COUNT)
             ?: emptyList()