Use Compose for Library screen (#7557)

- Move Pager to Compose
- Move AppBar to Compose
- Use Stable interface for state
- Use pills for no. of manga in category instead of (x)

app/src/main/java/eu/kanade/presentation/theme/Color.kt

@@ -0,0 +1,12 @@
+package eu.kanade.presentation.theme
+
+import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.material3.ColorScheme
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.graphics.Color
+
+val ColorScheme.active: Color
+    @Composable
+    get() {
+        return if (isSystemInDarkTheme()) Color(255, 235, 59) else Color(255, 193, 7)
+    }