feat: ability to change library (#77)

* feat: add AbsIcons font and update pubspec.yaml for font integration

* feat: implement library selection in YouPage

* fix: optimize authenticatedApi provider to not rebuild unnecessarily

* feat: add LibrarySwitchChip widget and integrate it into YouPage and ScaffoldWithNavBar

* feat: enhance library selection UI with refresh functionality and error handling

* fix: change library switcher activation from long press to double tap

* feat: show current library on nav bar

* feat: refactor LibraryBrowserPage to use CustomScrollView and enhance app bar with dynamic library icon and title

lib/api/library_provider.dart

@@ -0,0 +1,58 @@
+import 'package:hooks_riverpod/hooks_riverpod.dart' show Ref;
+import 'package:logging/logging.dart' show Logger;
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+
+import 'package:shelfsdk/audiobookshelf_api.dart' show Library;
+import 'package:vaani/api/api_provider.dart' show authenticatedApiProvider;
+import 'package:vaani/settings/api_settings_provider.dart'
+    show apiSettingsProvider;
+part 'library_provider.g.dart';
+
+final _logger = Logger('LibraryProvider');
+
+@riverpod
+Future<Library?> library(Ref ref, String id) async {
+  final api = ref.watch(authenticatedApiProvider);
+  final library = await api.libraries.get(libraryId: id);
+  if (library == null) {
+    _logger.warning('No library found through id: $id');
+    //  try to get the library from the list of libraries
+    final libraries = await ref.watch(librariesProvider.future);
+    for (final lib in libraries) {
+      if (lib.id == id) {
+        return lib;
+      }
+    }
+    _logger.warning('No library found in the list of libraries');
+    return null;
+  }
+  _logger.fine('Fetched library: ${library}');
+  return library.library;
+}
+
+@riverpod
+Future<Library?> currentLibrary(Ref ref) async {
+  final libraryId =
+      ref.watch(apiSettingsProvider.select((s) => s.activeLibraryId));
+  if (libraryId == null) {
+    _logger.warning('No active library id found');
+    return null;
+  }
+  return await ref.watch(libraryProvider(libraryId).future);
+}
+
+@riverpod
+class Libraries extends _$Libraries {
+  @override
+  FutureOr<List<Library>> build() async {
+    final api = ref.watch(authenticatedApiProvider);
+    final libraries = await api.libraries.getAll();
+    if (libraries == null) {
+      _logger.warning('Failed to fetch libraries');
+      return [];
+    }
+    _logger.fine('Fetched ${libraries.length} libraries');
+    ref.keepAlive();
+    return libraries;
+  }
+}