fix internal routing, and remove softlocking

src/app/(tabs)/library/_layout.tsx

@@ -1,6 +1,16 @@
 import { Stack } from 'expo-router';
 import { useColors } from '@/theme/themed';
 
+/**
+ * Anchor the library stack at its list. Without this, navigating straight to a
+ * detail route (from Home, quick search, or the now-playing overlay) builds a
+ * stack of just `[album]` with nothing beneath it — so popping one level had
+ * nowhere to go and back escaped the tab entirely.
+ */
+export const unstable_settings = {
+  initialRouteName: 'index',
+};
+
 /**
  * Nested stack inside the Library tab so album/artist detail screens keep the
  * tab bar + mini-player visible.

src/app/(tabs)/library/album/[key].tsx

@@ -40,7 +40,7 @@ export default function AlbumScreen() {
   const { key } = useLocalSearchParams<{ key: string }>();
   const { items: tracks, summary: album, totalCount, loadMore } = useNativeAlbumDetail(key);
   const currentPath = usePlayerStore((s) => s.currentTrack?.path);
-  const handleBack = useLibraryDetailBack();
+  const { goBack, backLabel } = useLibraryDetailBack();
   const insets = useSafeAreaInsets();
   const { scrollY, heroFaded, collapsed, onScroll, scrollEventThrottle, expandedHeight, onHeroBlockLayout } =
     useDetailCollapse();
@@ -154,7 +154,8 @@ export default function AlbumScreen() {
           </>
         }
         disabled={tracks.length === 0}
-        onBack={handleBack}
+        onBack={goBack}
+        backLabel={backLabel}
         onPlay={() => playFrom(0)}
         onShuffle={() => void playLibraryQuery({ kind: 'album', albumKey: key }, {
           shuffle: true,

src/app/(tabs)/library/artist/[name].tsx

@@ -71,7 +71,7 @@ export default function ArtistScreen() {
     name: string;
     credit?: string;
   }>();
-  const handleBack = useLibraryDetailBack();
+  const { goBack, backLabel } = useLibraryDetailBack();
   const insets = useSafeAreaInsets();
   const { scrollY, heroFaded, collapsed, onScroll, scrollEventThrottle, expandedHeight, onHeroBlockLayout } =
     useDetailCollapse();
@@ -246,7 +246,8 @@ export default function ArtistScreen() {
           </View>
         }
         disabled={disabled}
-        onBack={handleBack}
+        onBack={goBack}
+        backLabel={backLabel}
         onPlay={playArtist}
         onShuffle={shuffleArtist}
         scrollY={scrollY}

src/app/(tabs)/library/index.tsx

@@ -1,5 +1,5 @@
 import {
-  useEffect,
+  useCallback,
   useMemo,
   useState
 } from 'react';
@@ -11,7 +11,7 @@ import {
 } from 'react-native';
 import { Ionicons } from '@expo/vector-icons';
 import { FlashList } from '@shopify/flash-list';
-import { useRouter } from 'expo-router';
+import { useFocusEffect, useRouter } from 'expo-router';
 import { Screen } from '@/components/Screen';
 import { Text } from '@/components/Text';
 import { ViewModeSwitcher } from '@/components/library/ViewModeSwitcher';
@@ -165,14 +165,20 @@ export default function LibraryScreen() {
     setPlaylistPickerOpen(false);
   };
 
-  useEffect(() => {
-    if (!selectMode) return;
-    const sub = BackHandler.addEventListener('hardwareBackPress', () => {
-      exitSelection();
-      return true;
-    });
-    return () => sub.remove();
-  }, [selectMode]);
+  // Focus-gated, not a plain effect: the tabs layout keeps this screen mounted
+  // while blurred (`detachInactiveScreens={false}` + `freezeOnBlur: false`), so
+  // an ungated handler swallowed one back press anywhere in the app — any other
+  // tab, any settings screen — whenever selection happened to be active.
+  useFocusEffect(
+    useCallback(() => {
+      if (!selectMode) return undefined;
+      const sub = BackHandler.addEventListener('hardwareBackPress', () => {
+        exitSelection();
+        return true;
+      });
+      return () => sub.remove();
+    }, [selectMode])
+  );
 
   const selectedDbTracks = () => sortedTracks.filter((track) => selectedIds.has(track.id));
 

src/app/(tabs)/library/playlist/[id].tsx

@@ -89,7 +89,7 @@ export default function PlaylistScreen() {
   const colors = useColors();
   const router = useRouter();
   const { id } = useLocalSearchParams<{ id: string }>();
-  const handleBack = useLibraryDetailBack();
+  const { goBack, backLabel } = useLibraryDetailBack();
   const isFavorites = id === 'favorites';
   const playlistId = isFavorites ? null : Number(id);
 
@@ -219,7 +219,7 @@ export default function PlaylistScreen() {
           void (async () => {
             try {
               await deletePlaylist(target.id);
-              handleBack();
+              goBack();
             } catch (err) {
               Alert.alert('Delete failed', errorMessage(err));
             }
@@ -340,7 +340,8 @@ export default function PlaylistScreen() {
           ) : null
         }
         disabled={playable.length === 0}
-        onBack={handleBack}
+        onBack={goBack}
+        backLabel={backLabel}
         onMore={() => setOptionsOpen(true)}
         onPlay={() => startPlayback(0)}
         onShuffle={startShuffle}