feat(lyrics): тексты песен внутри приложения через LRCLIB

- LrcLibApi (api/get + api/search, User-Agent), DI @Named(lrclib) Retrofit
- LyricsRepository.fetchLyrics -> LyricsResult (plain/synced/instrumental)
- LyricsViewModel + LyricsSheet (загрузка/инструментал/найдено/не найдено),
  прокрутка + атрибуция LRCLIB
- кнопка «Текст песни» открывает встроенный экран (плеер + деталь трека чартов),
  вместо ссылки в браузере

app/src/main/java/com/radiola/ui/lyrics/LyricsSheet.kt

@@ -0,0 +1,125 @@
+package com.radiola.ui.lyrics
+
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+import androidx.hilt.navigation.compose.hiltViewModel
+import com.radiola.ui.theme.RadiolaTheme
+
+/**
+ * Содержимое шторки текста песни. Данные загружаются через LyricsViewModel → LRCLIB API.
+ * Встраивается в ModalBottomSheet на стороне вызывающего экрана.
+ */
+@Composable
+fun LyricsSheet(
+    artist: String,
+    song: String,
+    durationSec: Int? = null,
+    viewModel: LyricsViewModel = hiltViewModel()
+) {
+    val colors = RadiolaTheme.colors
+    val state by viewModel.state.collectAsState()
+
+    LaunchedEffect(artist, song) {
+        viewModel.load(artist, song, durationSec)
+    }
+
+    Column(
+        modifier = Modifier
+            .fillMaxWidth()
+            .padding(horizontal = 20.dp)
+    ) {
+        // Заголовок
+        Text(
+            text = song,
+            style = MaterialTheme.typography.titleLarge,
+            color = colors.textPrimary,
+            maxLines = 2
+        )
+        Spacer(Modifier.height(4.dp))
+        Text(
+            text = artist,
+            style = MaterialTheme.typography.bodyMedium,
+            color = colors.textSecondary,
+            maxLines = 1
+        )
+        Spacer(Modifier.height(20.dp))
+
+        // Состояния
+        when (val s = state) {
+            is LyricsState.Loading -> {
+                Box(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .height(180.dp),
+                    contentAlignment = Alignment.Center
+                ) {
+                    CircularProgressIndicator(color = colors.accent)
+                }
+            }
+
+            is LyricsState.Instrumental -> {
+                Text(
+                    text = "Инструментальная композиция",
+                    style = MaterialTheme.typography.bodyLarge,
+                    color = colors.textMuted,
+                    modifier = Modifier.padding(vertical = 40.dp)
+                )
+            }
+
+            is LyricsState.Found -> {
+                Column(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .heightIn(max = 480.dp)
+                        .verticalScroll(rememberScrollState()),
+                    verticalArrangement = Arrangement.spacedBy(4.dp)
+                ) {
+                    s.plain.lines().forEach { line ->
+                        Text(
+                            text = line.ifEmpty { " " },
+                            style = MaterialTheme.typography.bodyLarge,
+                            color = colors.textPrimary,
+                            lineHeight = MaterialTheme.typography.bodyLarge.lineHeight * 1.4f
+                        )
+                    }
+                }
+            }
+
+            is LyricsState.NotFound -> {
+                Text(
+                    text = "Текст не найден",
+                    style = MaterialTheme.typography.bodyLarge,
+                    color = colors.textMuted,
+                    modifier = Modifier.padding(vertical = 40.dp)
+                )
+            }
+
+            is LyricsState.Error -> {
+                Text(
+                    text = "Не удалось загрузить текст",
+                    style = MaterialTheme.typography.bodyLarge,
+                    color = colors.textMuted,
+                    modifier = Modifier.padding(vertical = 40.dp)
+                )
+            }
+        }
+
+        Spacer(Modifier.height(12.dp))
+
+        // Атрибуция LRCLIB
+        Text(
+            text = "Тексты: LRCLIB",
+            style = MaterialTheme.typography.labelSmall,
+            color = colors.textMuted,
+            modifier = Modifier
+                .align(Alignment.CenterHorizontally)
+                .padding(bottom = 16.dp)
+        )
+    }
+}