Redesign 3D gallery as single hall per artist with exit navigation.

Restore React client source, add hall-to-hall navigation via painting influences grouped by movement, and update documentation.

Co-authored-by: Cursor <cursoragent@cursor.com>

client/src/types/index.ts

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+export interface HistoricalEra {
+  id: number;
+  name: string;
+  start_year: number;
+  end_year: number;
+  start_definite: boolean;
+  end_definite: boolean;
+  description: string;
+  sort_order: number;
+}
+
+export interface ArtMovement {
+  id: number;
+  name: string;
+  start_year: number;
+  end_year: number;
+  start_definite: boolean;
+  end_definite: boolean;
+  era_id: number;
+  era_name?: string;
+  description: string;
+  color: string;
+}
+
+export interface Artist {
+  id: number;
+  name: string;
+  birth_year: number;
+  death_year: number;
+  movement_id: number;
+  movement_name?: string;
+  movement_color?: string;
+  portrait_path: string;
+  bio_short: string;
+  bio_full: string;
+  wikipedia_title: string;
+  century: number;
+}
+
+export interface ArtistPeriod {
+  id: number;
+  artist_id: number;
+  name: string;
+  start_year: number;
+  end_year: number;
+  description: string;
+  sort_order: number;
+}
+
+export interface Painting {
+  id: number;
+  artist_id: number;
+  period_id: number;
+  title: string;
+  year: number;
+  year_end?: number;
+  description: string;
+  image_path: string;
+  thumbnail_path?: string;
+  wikipedia_title: string;
+  sort_order: number;
+  artist_name?: string;
+}
+
+export interface InfluenceLink {
+  notes: string;
+  source: string;
+  aspects?: string;
+  quote?: string;
+  source_author?: string;
+  source_url?: string;
+  id: number;
+  title: string;
+  year: number;
+  image_path: string;
+  artist_name: string;
+  artist_id: number;
+}
+
+export interface PaintingDetail {
+  painting: Painting & { artist_name: string; artist_portrait: string };
+  influencedBy: InfluenceLink[];
+  influenced: InfluenceLink[];
+}
+
+export interface ArtistDetail {
+  artist: Artist & { movement_name: string };
+  periods: ArtistPeriod[];
+  paintings: Painting[];
+}
+
+export interface TimelineData {
+  eras: HistoricalEra[];
+  movements: ArtMovement[];
+}
+
+export interface YearBounds {
+  min_year: number;
+  max_year: number;
+}
+
+export interface NavigationArtist {
+  id: number;
+  name: string;
+  birth_year: number | null;
+  death_year: number | null;
+  portrait_path: string | null;
+}
+
+export interface MovementArtistGroup {
+  movement_id: number | null;
+  movement_name: string;
+  movement_color: string;
+  artists: NavigationArtist[];
+}
+
+export interface ArtistNavigation {
+  predecessors: MovementArtistGroup[];
+  successors: MovementArtistGroup[];
+}