fix(tv): keep "See All" detail stable and Back returning to library list

The home "See All" detail opens in the libraries tab. When that tab already
had its index in the stack (e.g. after a previous See All + Back), the stack
became [index, detail], which the native bottom tab reliably auto-popped back
to index — the detail "bounced" to the library list ~0.5s after opening.

- Pass a `fromSeeAll` flag from the See All button.
- On the detail page, collapse the libraries stack to [detail] when deep-linked
  on top of the index, so the native tab has nothing to auto-pop to.
- Intercept TV Back (while focused) to route to the library list so the user
  can switch libraries, instead of exiting the tab to home.

Claude-Session: https://claude.ai/code/session_016Hhu5DruGLPhdP4LAoy1Xd

app/(auth)/(tabs)/(libraries)/[libraryId].tsx

@@ -12,11 +12,16 @@ import {
 import { FlashList } from "@shopify/flash-list";
 import { useInfiniteQuery, useQuery } from "@tanstack/react-query";
 import { Image } from "expo-image";
-import { useLocalSearchParams, useNavigation } from "expo-router";
+import {
+  useFocusEffect,
+  useLocalSearchParams,
+  useNavigation,
+} from "expo-router";
 import { useAtom } from "jotai";
-import React, { useCallback, useEffect, useMemo } from "react";
+import React, { useCallback, useEffect, useMemo, useRef } from "react";
 import { useTranslation } from "react-i18next";
 import {
+  BackHandler,
   FlatList,
   Platform,
   ScrollView,
@@ -80,8 +85,9 @@ const Page = () => {
     sortBy?: string;
     sortOrder?: string;
     filterBy?: string;
+    fromSeeAll?: string;
   };
-  const { libraryId } = searchParams;
+  const { libraryId, fromSeeAll } = searchParams;
 
   const typography = useScaledTVTypography();
   const posterSizes = useScaledTVPosterSizes();
@@ -112,6 +118,22 @@ const Page = () => {
   const { t } = useTranslation();
   const router = useRouter();
   const { showOptions } = useTVOptionModal();
+
+  // When this library detail was opened from the home "See All" button, its
+  // libraries stack is just [detail], so the default TV Back would exit to home.
+  // Intercept Back (scoped to while this screen is focused via useFocusEffect) and
+  // route to the library list instead, so the user can switch libraries. Normal
+  // entries from the list keep their native pop-to-list behavior.
+  useFocusEffect(
+    useCallback(() => {
+      if (!Platform.isTV || fromSeeAll !== "true") return;
+      const sub = BackHandler.addEventListener("hardwareBackPress", () => {
+        router.replace("/(auth)/(tabs)/(libraries)");
+        return true;
+      });
+      return () => sub.remove();
+    }, [fromSeeAll, router]),
+  );
   const { showItemActions } = useTVItemActionModal();
 
   // TV Filter queries
@@ -269,6 +291,23 @@ const Page = () => {
     });
   }, [library]);
 
+  // If this See-All detail was deep-linked on top of the libraries index, collapse
+  // the libraries stack to just this screen. Otherwise the stack is [index, detail],
+  // which the native bottom tab reliably auto-pops back to the index (the detail
+  // "bounces" to the library list ~0.5s after opening). With [detail] alone it stays
+  // put, and Back is handled explicitly by the fromSeeAll interceptor above.
+  const didCollapseRef = useRef(false);
+  useEffect(() => {
+    if (!Platform.isTV || fromSeeAll !== "true" || didCollapseRef.current)
+      return;
+    const state = navigation.getState();
+    if (state?.routes && state.routes.length > 1) {
+      didCollapseRef.current = true;
+      const top = state.routes[state.routes.length - 1];
+      navigation.reset({ index: 0, routes: [top] } as any);
+    }
+  }, [navigation, fromSeeAll]);
+
   const fetchItems = useCallback(
     async ({
       pageParam,