feat(mobile): pasek chowa sie przy przewijaniu w dol (hystereza po drodze), FAB jedzie z nim, podpowiedz Sites do pierwszego przypiecia

- useAutoHideOnScroll: licznik drogi w jednym kierunku (48 px w dol chowa, 24 w gore
  pokazuje), strefy zawsze-widoczny przy gorze i dole listy, overscroll ignorowany
- HomeScreen useFocusEffect pokazuje pasek po powrocie z ekranu szczegolow
- changelog 2026-09-07e/f, OTA 40931479 i 8604dadb na 1.3

mobile/src/changelog.ts

@@ -29,6 +29,21 @@ export type ChangelogEntry = {
 };
 
 export const CHANGELOG: ChangelogEntry[] = [
+  {
+    id: '2026-09-07f',
+    date: 'September 2026',
+    items: [
+      'The bottom bar is back on screen whenever you return from a scene, movie or performer, even if it was tucked away before you left.',
+    ],
+  },
+  {
+    id: '2026-09-07e',
+    date: 'September 2026',
+    items: [
+      'The bottom bar slides away while you scroll down and comes back as soon as you scroll up, so the grid gets the whole screen.',
+      'Sites: the pinning hint disappears once you have pinned something.',
+    ],
+  },
   {
     id: '2026-09-07d',
     date: 'September 2026',

mobile/src/components/BugReportFAB.tsx

@@ -17,6 +17,7 @@ import React, { useCallback, useState } from 'react';
 import {
   ActivityIndicator,
   Alert,
+  Animated,
   Image,
   KeyboardAvoidingView,
   Modal,
@@ -35,7 +36,7 @@ import { captureScreen } from 'react-native-view-shot';
 
 import { GoonClient } from '../api';
 import { theme } from '../theme';
-import { BOTTOM_BAR_GAP, BOTTOM_BAR_HEIGHT } from '../lib/bottomBar';
+import { BOTTOM_BAR_GAP, BOTTOM_BAR_HEIGHT, barHidden } from '../lib/bottomBar';
 import { formatLastPlayback } from '../lib/lastPlayback';
 import { getSxyprnDiag } from '../lib/sxyprnResolver';
 
@@ -123,6 +124,9 @@ export function BugReportFAB({ client, appVersion, navRef }: Props) {
   const insets = useSafeAreaInsets();
   const liftAboveTabs = currentRoute === null || currentRoute === 'Scenes';
   const fabBottom = 24 + (liftAboveTabs ? insets.bottom + BOTTOM_BAR_GAP + BOTTOM_BAR_HEIGHT : 0);
+  // Gdy pasek chowa sie na scroll, FAB zjezdza o tyle samo (ta sama wartosc Animated).
+  const fabShift = liftAboveTabs ? insets.bottom + BOTTOM_BAR_GAP + BOTTOM_BAR_HEIGHT + 6 : 0;
+  const fabTranslate = barHidden.interpolate({ inputRange: [0, 1], outputRange: [0, fabShift] });
 
   const onPress = useCallback(async () => {
     let captured: string | null = null;
@@ -244,7 +248,10 @@ export function BugReportFAB({ client, appVersion, navRef }: Props) {
   return (
     <>
       {!hidden ? (
-        <TouchableOpacity style={[styles.fab, { bottom: fabBottom }]} onPress={onPress} activeOpacity={0.7}>
+        <Animated.View
+          style={[styles.fabWrap, { bottom: fabBottom, transform: [{ translateY: fabTranslate }] }]}
+        >
+          <TouchableOpacity style={styles.fab} onPress={onPress} activeOpacity={0.7}>
             <Text style={styles.fabIcon}>?</Text>
             {unseen > 0 ? (
               <View style={styles.fabDot}>
@@ -252,6 +259,7 @@ export function BugReportFAB({ client, appVersion, navRef }: Props) {
               </View>
             ) : null}
           </TouchableOpacity>
+        </Animated.View>
       ) : null}
 
       <Modal
@@ -381,10 +389,12 @@ export function BugReportFAB({ client, appVersion, navRef }: Props) {
 }
 
 const styles = StyleSheet.create({
-  fab: {
+  fabWrap: {
     position: 'absolute',
     right: 16,
     bottom: 24,
+  },
+  fab: {
     width: 44,
     height: 44,
     borderRadius: 22,

mobile/src/navigation.tsx

@@ -1,8 +1,10 @@
 import {
   DefaultTheme,
   NavigationContainer,
+  useFocusEffect,
   useNavigationContainerRef,
 } from '@react-navigation/native';
+import { setBarHidden } from './lib/bottomBar';
 import { BugReportFAB } from './components/BugReportFAB';
 import { BottomTabsBar } from './components/BottomTabsBar';
 import { GoonClient } from './api';
@@ -140,6 +142,14 @@ function HomeScreen({ navigation }: { navigation: { setParams: (p: { tab?: strin
     navigation.setParams({ tab });
   }, [tab, navigation]);
 
+  // Powrot z ekranu sceny/filmu/performera: pasek ma byc widoczny, nawet jesli lista
+  // zostala przewinieta i pasek schowal sie przed wyjsciem (test 2026-09-07).
+  useFocusEffect(
+    React.useCallback(() => {
+      setBarHidden(false);
+    }, []),
+  );
+
   return (
     <View style={{ flex: 1, paddingTop: insets.top, backgroundColor: theme.bg }}>
       {/* Gornej belki nie ma (2026-09-07): nazwe sekcji mowi pasek na dole, kolo zebate

mobile/src/screens/MoviesScreen.tsx

@@ -20,7 +20,7 @@ import {
   MovieFilters,
   MovieFiltersSheet,
 } from '../components/MovieFiltersSheet';
-import { useBottomBarInset, useScrollTopListener } from '../lib/bottomBar';
+import { useAutoHideOnScroll, useBottomBarInset, useScrollTopListener } from '../lib/bottomBar';
 import { usePersistedState } from '../lib/persistedState';
 import { MoviePosterCard } from '../components/MoviePosterCard';
 import type { MovieOut } from '../types';
@@ -51,6 +51,7 @@ export function MoviesScreen() {
     React.useCallback(() => listRef.current?.scrollToOffset({ offset: 0, animated: true }), []),
   );
   const bottomInset = useBottomBarInset();
+  const onListScroll = useAutoHideOnScroll();
   // seenSince: ISO timestamp ostatniego "kompletnie obejrzanej listy". Movies
   // z created_at > seenSince mają NEW badge. Ładujemy z SecureStore raz
   // przy mount; aktualizujemy gdy app idzie do tła (user widzi NEW przez
@@ -152,6 +153,8 @@ export function MoviesScreen() {
         ref={listRef}
         data={items}
         numColumns={NUM_COLS}
+        onScroll={onListScroll}
+        scrollEventThrottle={16}
         keyExtractor={(m) => m.id}
         // Android removeClippedSubviews=true blankuje plakaty po scrollu (expo-image
         // nie re-renderuje odpiętych), ten sam bug co "znikające miniaturki" scen.

mobile/src/screens/ScenesScreen.tsx

@@ -23,7 +23,7 @@ import {
   SettingsButton,
   Toolbar,
 } from '../ui';
-import { useBottomBarInset, useScrollTopListener } from '../lib/bottomBar';
+import { useAutoHideOnScroll, useBottomBarInset, useScrollTopListener } from '../lib/bottomBar';
 import { SceneTile, sceneGridProps } from '../components/SceneTile';
 import { SceneGridSkeleton } from '../components/SceneGridSkeleton';
 import { Thumb } from '../components/Thumb';
@@ -75,6 +75,7 @@ export function ScenesScreen({
     React.useCallback(() => listRef.current?.scrollToOffset({ offset: 0, animated: true }), []),
   );
   const bottomInset = useBottomBarInset();
+  const onListScroll = useAutoHideOnScroll();
 
   React.useEffect(() => {
     const t = setTimeout(() => setDebouncedQ(q), 350);
@@ -273,6 +274,8 @@ export function ScenesScreen({
         ref={listRef}
         {...sceneGridProps(gridColumns)}
         data={items}
+        onScroll={onListScroll}
+        scrollEventThrottle={16}
         keyExtractor={(s) => s.id}
         // removeClippedSubviews + okno renderowania (windowSize itd.) idą z sceneGridProps
         // patrz SceneTile. Perf bug-report 5b7ca1e1 (jank/obciążenie przy długim scrollu).

mobile/src/screens/SitesScreen.tsx

@@ -23,7 +23,7 @@ import type { RootStackParamList } from '../navigation';
 import { theme } from '../theme';
 import { PillButton, SCREEN_PAD_H, SCREEN_PAD_TOP, SearchInput, SettingsButton, Toolbar } from '../ui';
 import type { SourceOut, SourceRating } from '../types';
-import { useBottomBarInset, useScrollTopListener } from '../lib/bottomBar';
+import { useAutoHideOnScroll, useBottomBarInset, useScrollTopListener } from '../lib/bottomBar';
 
 type Order = 'popular' | 'recent';
 
@@ -42,6 +42,7 @@ export function SitesScreen() {
     React.useCallback(() => listRef.current?.scrollToOffset({ offset: 0, animated: true }), []),
   );
   const bottomInset = useBottomBarInset();
+  const onListScroll = useAutoHideOnScroll();
 
   React.useEffect(() => {
     const t = setTimeout(() => setDebouncedQ(q), 250);
@@ -108,7 +109,9 @@ export function SitesScreen() {
         <PillButton label="Top" compact active={order === 'popular'} onPress={() => setOrder('popular')} />
         <PillButton label="Recent" compact active={order === 'recent'} onPress={() => setOrder('recent')} />
       </View>
+      {favQuery.data && pinned.size === 0 ? (
         <Text style={styles.hint}>long-press a site to pin it to the top</Text>
+      ) : null}
 
       {isLoading && <ActivityIndicator color={theme.fg} style={{ marginTop: 24 }} />}
       {error instanceof Error && <Text style={styles.error}>{error.message}</Text>}
@@ -117,6 +120,8 @@ export function SitesScreen() {
         ref={listRef}
         data={items}
         keyExtractor={(s) => s.origin}
+        onScroll={onListScroll}
+        scrollEventThrottle={16}
         numColumns={2}
         columnWrapperStyle={styles.gridRow}
         renderItem={({ item }) => (