feat(ui): рестайл общих компонентов под дизайн-систему

- StationCard: обложка/иконка-заглушка, анимированное сердечко, pressScale
- MiniPlayer: elevated-бар, метка «СЕЙЧАС ИГРАЕТ», Crossfade play/pause
- SearchBar: surface-поле, акцентный курсор, скругление 14
- FilterChips: акцентный активный чип с анимацией цвета
- EmptyState: иконка-плашка + текст
- TrackListItem: thumb-заглушка, pressScale

app/src/main/java/com/radiola/ui/components/SearchBar.kt

@@ -1,10 +1,8 @@
 package com.radiola.ui.components
 
-import androidx.compose.foundation.background
-import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.Icon
-import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.material3.TextField
 import androidx.compose.material3.TextFieldDefaults
@@ -14,6 +12,7 @@ import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.unit.dp
 import com.composables.icons.lucide.Lucide
 import com.composables.icons.lucide.Search
+import com.radiola.ui.theme.RadiolaTheme
 
 @Composable
 fun SearchBar(
@@ -22,22 +21,23 @@ fun SearchBar(
     placeholder: String = "Поиск станции...",
     modifier: Modifier = Modifier
 ) {
+    val colors = RadiolaTheme.colors
     TextField(
         value = query,
         onValueChange = onQueryChange,
-        modifier = modifier
-            .fillMaxWidth()
-            .background(Color(0xFF2A2A2A), RoundedCornerShape(8.dp)),
-        placeholder = { Text(placeholder, color = Color(0xFF888888)) },
-        leadingIcon = { Icon(Lucide.Search, contentDescription = null, tint = Color(0xFF888888)) },
+        modifier = modifier.fillMaxWidth(),
+        shape = RoundedCornerShape(14.dp),
+        placeholder = { Text(placeholder, color = colors.textMuted) },
+        leadingIcon = { Icon(Lucide.Search, contentDescription = null, tint = colors.textMuted) },
         singleLine = true,
         colors = TextFieldDefaults.colors(
-            focusedContainerColor = Color(0xFF2A2A2A),
-            unfocusedContainerColor = Color(0xFF2A2A2A),
+            focusedContainerColor = colors.surface,
+            unfocusedContainerColor = colors.surface,
             focusedIndicatorColor = Color.Transparent,
             unfocusedIndicatorColor = Color.Transparent,
-            focusedTextColor = Color.White,
-            unfocusedTextColor = Color.White
+            cursorColor = colors.accent,
+            focusedTextColor = colors.textPrimary,
+            unfocusedTextColor = colors.textPrimary
         )
     )
 }