Initial TTRPG character meta-builder with visual sheet editor.

Offline Electron app seeds 10 system presets, supports create-from-scratch designer with palette/drag/resize/bricks, and exports .ttrpg-system.json for the player.

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

app/preload/index.ts

@@ -0,0 +1,32 @@
+import { contextBridge, ipcRenderer } from 'electron';
+
+import type { CharacterSheet, SystemDefinition } from '../shared/types.ts';
+
+const api = {
+  listSystems: () => ipcRenderer.invoke('systems:list') as Promise<
+    Array<{ id: string; name: string; revision: number; schemaVersion: number }>
+  >,
+  getSystem: (id: string) => ipcRenderer.invoke('systems:get', id) as Promise<SystemDefinition | null>,
+  upsertSystem: (system: SystemDefinition) =>
+    ipcRenderer.invoke('systems:upsert', system) as Promise<SystemDefinition>,
+  deleteSystem: (id: string) => ipcRenderer.invoke('systems:delete', id) as Promise<boolean>,
+  exportSystem: (id: string) => ipcRenderer.invoke('systems:export', id) as Promise<string | null>,
+  importSystem: () => ipcRenderer.invoke('systems:import') as Promise<SystemDefinition | null>,
+  listPresets: () => ipcRenderer.invoke('presets:list') as Promise<string[]>,
+  loadPreset: (filePath: string) =>
+    ipcRenderer.invoke('presets:load', filePath) as Promise<SystemDefinition>,
+  seedPresets: () => ipcRenderer.invoke('presets:seed') as Promise<number>,
+  listCharacters: (systemId?: string) =>
+    ipcRenderer.invoke('characters:list', systemId) as Promise<
+      Array<{ id: string; name: string; systemId: string }>
+    >,
+  getCharacter: (id: string) =>
+    ipcRenderer.invoke('characters:get', id) as Promise<CharacterSheet | null>,
+  upsertCharacter: (character: CharacterSheet) =>
+    ipcRenderer.invoke('characters:upsert', character) as Promise<CharacterSheet>,
+  deleteCharacter: (id: string) => ipcRenderer.invoke('characters:delete', id) as Promise<boolean>,
+};
+
+contextBridge.exposeInMainWorld('ttrpgBuilder', api);
+
+export type TtrpgBuilderApi = typeof api;