feat(mobile): sign-in, tabs, search, collection and background player (M5)

- expo-router app in src/app: connect (server check, recent servers),
  login, mandatory credential / password change, tabs Home / Search /
  Collection / Profile, album and artist pages, full-screen player
- AuthSession per server with the refresh token in expo-secure-store
  (Android Keystore); language from the profile
- player on react-native-track-player: ExoPlayer queue with a
  notification and lock-screen controls via a playback service, 500 MB
  stream cache, quality by network (Wi-Fi high, cellular medium),
  play events with played time, reactions, playback state restore and
  the endless My Wave with feedback
- home: pulsing wave circle driven by BPM / energy in the cover
  palette, activity and mood chips that switch the wave on the fly
- New Architecture is off until react-native-track-player supports it;
  the release build runs codegen only when it is on; query-string is a
  direct dependency because expo-router 5.1 imports it undeclared

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/mobile/src/app/(tabs)/collection.tsx

@@ -0,0 +1,80 @@
+import { unwrap, type Track } from '@pipu/core';
+import { useInfiniteQuery } from '@tanstack/react-query';
+import { useState } from 'react';
+import { useTranslation } from 'react-i18next';
+import { FlatList, Text, View } from 'react-native';
+
+import { useSession } from '../../lib/session';
+import { player } from '../../player/controller';
+import { usePlayerState } from '../../player/hooks';
+import { colors } from '../../theme';
+import { Button, H1, Screen, Segmented, TrackRow } from '../../ui/kit';
+
+type Tab = 'history' | 'likes' | 'dislikes';
+
+export default function CollectionScreen() {
+  const { t, i18n } = useTranslation();
+  const session = useSession();
+  const current = usePlayerState().track;
+  const [tab, setTab] = useState<Tab>('likes');
+
+  const list = useInfiniteQuery({
+    queryKey: ['m-collection', tab],
+    initialPageParam: undefined as string | undefined,
+    queryFn: async ({ pageParam }) => {
+      const query = { query: { cursor: pageParam, limit: 100 } };
+      if (tab === 'history') {
+        const page = unwrap(await session.client.GET('/api/v1/me/history', { params: query }));
+        return { items: page.items.map((i) => ({ track: i.track, at: i.played_at })), next: page.next_cursor };
+      }
+      const path = tab === 'likes' ? '/api/v1/me/likes' : '/api/v1/me/dislikes';
+      const page = unwrap(await session.client.GET(path, { params: query }));
+      return { items: page.items.map((i) => ({ track: i.track, at: i.created_at })), next: page.next_cursor };
+    },
+    getNextPageParam: (p) => p.next ?? undefined,
+  });
+  const items = list.data?.pages.flatMap((p) => p.items) ?? [];
+  const tracks: Track[] = items.map((i) => i.track);
+  const time = new Intl.DateTimeFormat(i18n.language, { day: 'numeric', month: 'short', hour: '2-digit', minute: '2-digit' });
+  const context = tab === 'history' ? ({ type: 'history' } as const) : ({ type: 'collection', id: tab } as const);
+  const empty = { history: 'collection.empty_history', likes: 'collection.empty_likes', dislikes: 'collection.empty_dislikes' } as const;
+
+  return (
+    <Screen>
+      <FlatList
+        data={items}
+        keyExtractor={(it, i) => `${it.track.id}-${i}`}
+        onEndReached={() => list.hasNextPage && void list.fetchNextPage()}
+        onRefresh={() => void list.refetch()}
+        refreshing={list.isRefetching}
+        ListHeaderComponent={
+          <View style={{ padding: 16, gap: 14 }}>
+            <H1>{t('collection.title')}</H1>
+            <Segmented<Tab>
+              value={tab}
+              onChange={setTab}
+              options={[
+                { value: 'likes', label: t('collection.likes') },
+                { value: 'history', label: t('collection.history') },
+                { value: 'dislikes', label: t('collection.dislikes') },
+              ]}
+            />
+            {tab === 'likes' && tracks.length > 0 && (
+              <Button title={t('collection.play_all')} icon="play-arrow" onPress={() => void player.playList(tracks, 0, context)} />
+            )}
+          </View>
+        }
+        ListEmptyComponent={list.isSuccess ? <Text style={{ color: colors.text3, textAlign: 'center', padding: 24 }}>{t(empty[tab])}</Text> : null}
+        renderItem={({ item, index }) => (
+          <TrackRow
+            track={item.track}
+            current={current?.id === item.track.id}
+            meta={tab === 'history' ? time.format(new Date(item.at)) : undefined}
+            onPress={() => void player.playList(tracks, index, context)}
+            onLike={tab === 'dislikes' ? undefined : () => void player.react(item.track, item.track.reaction === 'like' ? null : 'like').then(() => list.refetch())}
+          />
+        )}
+      />
+    </Screen>
+  );
+}