feat: add Library 2.0A organization and search

[Ayerdi]

Summary

Implement the first post-foundation product slice from docs/ROADMAP.md: Library 2.0A.

The change keeps tracking identity small and adds separate user-owned library state plus lightweight WPF filtering and an explicit organization workflow. The design was also reviewed against the current Ayerdi/gestor-juegos schema/API so a future Gestor-backed catalogue can remain an optional adapter rather than becoming a GameHours runtime dependency.

No online metadata, tags, fuzzy-search dependency, alternate game scanner or Gestor network request is introduced.

User-facing behavior

• search games by title without case/diacritic sensitivity;
• multi-word search plus lightweight title acronym matching (for example g1r -> Gothic 1 Remake);
• quick scopes: Todos, Favoritos, En ejecución, Pendientes, Jugando, Pausados, Completados, Abandonados and Ocultos;
• dedicated Organizar biblioteca view with visible per-game status, favorite and hide/show actions;
• the normal Library view shows the persisted user completion state (Pendiente, Jugando, Pausado, Completado, Abandonado) as a compact chip beside the game title; Sin estado stays visually empty;
• status/favorite/visibility changes are saved immediately and the normal library/filter projection refreshes from the same persisted preferences;
• the shared dark ComboBox template renders both the open popup and the closed selected value with explicit GameHours foreground colors, avoiding unreadable Windows default text;
• right-click remains available as a compact shortcut for the same organization actions;
• hidden games keep all playtime/history and are recoverable through the Ocultos scope;
• the existing active-first / most-recently-played ordering remains unchanged;
• Jugando is a user library/progress state and remains distinct from En ejecución, which reflects actual live process tracking.

Architecture

• TrackedGame remains unchanged.
• New LibraryGamePreferences / LibraryCompletionStatus domain types own user organization state.
• SQLite schema v8 adds sparse game_library_preferences with a game FK and cascade cleanup.
• SqliteLibraryGamePreferencesRepository deletes rows that return to the default state rather than storing empty preferences.
• WPF uses the existing ICollectionView: one custom sort plus one filter. No duplicate library data source or search index.
• LibraryToolbar and LibraryOrganizerView keep library interaction out of the tracking/domain model.
• The visible status chip is a projection of the same persisted LibraryGamePreferences; it is not copied into TrackedGame or GameRowViewModel. A small WPF binding invalidation signal makes the projection re-evaluate after load/write.
• Preference writes are serialized and apply mutations over the latest loaded state rather than stale UI snapshots.

Optional external catalogue compatibility

• GameHours UUID remains the authoritative tracking identity.
• schema v8 also adds game_external_identities for provider-scoped correlation such as steam:3946950;
• provider names are normalized, while external values remain exact so each provider owns its own ID semantics;
• one provider identity cannot silently be attached to two GameHours UUIDs;
• Steam/Epic/GOG discovery already exposes the source ExternalId, and GameExternalIdentityProviders provides the neutral mapping boundary for a future backfill/adapter;
• a future Gestor adapter should correlate Steam identities with catalogo_juegos.steam_id; catalogo_juego_id remains Gestor-local adapter state and never replaces the GameHours UUID;
• shared personal states align with Gestor: Pendiente, Jugando, Pausado, Completado and Abandonado;
• Gestor favorito maps naturally to GameHours favorite;
• GameHours hidden/archive is intentionally local-only;
• Gestor completado_100 is not treated as the same concept as GameHours Completed status;
• GameHours measured sessions/playtime remain authoritative and are never overwritten by Gestor tiempo_jugado or Steam snapshots.

The reviewed compatibility and authority rules are documented under integration/gestor-juegos/.

Research applied

• Playnite (MIT) was used as a product/model reference for Favorite, Hidden and CompletionStatus, while intentionally not copying its large all-purpose Game model.
• WPF's existing collection-view filtering/sorting and binding notification mechanisms are used instead of adding another state layer or search framework.
• Search uses .NET culture-aware comparison with IgnoreCase | IgnoreNonSpace rather than a new dependency.
• The current Ayerdi/gestor-juegos database/API was reviewed directly. Its separation between global catalogo_juegos and user-owned mis_juegos supports keeping GameHours catalogue identity and personal preferences separate as well.

No third-party source code was copied or adapted in this PR.

Tests added/updated

• schema v8 migration, repair and old-backup restore behavior;
• library preference round-trip, including Paused, sparse-default deletion and FK cascade;
• provider-scoped external identity round-trip, reverse lookup, uniqueness and provider-defined value semantics;
• discovered Steam/Epic/GOG identity mapping without inventing identity for loose processes;
• case/accent/acronym-friendly search;
• hidden/default scope behavior;
• favorite/completion/paused/running scopes;
• composition of search + scopes;
• user-facing completion-state labels, including the empty Sin estado presentation;
• existing active/recent ordering and active-game navigation tests remain in place.

Scope deliberately deferred

• actual Gestor HTTP/authentication integration;
• automatic external-identity backfill beyond the neutral mapping/persistence boundary;
• bidirectional preference sync and conflict resolution;
• tags and compound tag filtering;
• richer empty states / keyboard polish;
• online metadata/artwork provider implementation (Library 2.0C);
• visual library-card redesign;
• portable JSON representation of library preferences/identity links (exact SQLite backup already preserves them; portable-format evolution should be a separate reviewed change).

Validation

Validated on head 63cfd9e7f65967d96f600e3bd398317bd328b278 against current main 1a37362a53594d4bed2603f43e7c3e3693e2cc46:

• locked restore: success;
• Release build: 0 warnings / 0 errors;
• GameHours.Tests: 161/161;
• GameHours.Windows.Tests: 292/292;
• total automated tests: 453/453;
• self-contained win-x64 desktop publish smoke: success;
• CodeQL Actions/C#: success;
• real-Windows visual/interaction verification of the Library organization ComboBoxes and persisted status presentation: verified.

Velopack package/update-chain and install/uninstall recovery smokes remain intentionally skipped while the PR is draft. The PR is ready to leave draft once GitHub accepts the state transition.