Clean up storage usage info

- Show bar representation of used/total space
- Handle all mounted storages
- Also included a bunch of unrelated immutables changes, sorry

app/src/main/java/eu/kanade/presentation/reader/ChapterTransition.kt

@@ -37,6 +37,7 @@ import eu.kanade.presentation.theme.TachiyomiTheme
 import eu.kanade.tachiyomi.data.database.models.toDomainChapter
 import eu.kanade.tachiyomi.ui.reader.model.ChapterTransition
 import eu.kanade.tachiyomi.ui.reader.model.ReaderChapter
+import kotlinx.collections.immutable.persistentMapOf
 import tachiyomi.domain.chapter.model.Chapter
 import tachiyomi.domain.chapter.service.calculateChapterGap
 import tachiyomi.i18n.MR
@@ -234,7 +235,7 @@ private fun ChapterText(
             maxLines = 5,
             overflow = TextOverflow.Ellipsis,
             style = MaterialTheme.typography.titleLarge,
-            inlineContent = mapOf(
+            inlineContent = persistentMapOf(
                 DownloadedIconContentId to InlineTextContent(
                     Placeholder(
                         width = 22.sp,