Add browser-only editor export and 2.5D runtime presentation

editor/startup.ts

@@ -0,0 +1,35 @@
+import { type Project, clone, validateProject } from '../engine/schema.ts';
+import { defaultProject } from '../engine/templates.ts';
+import { loadDraft } from './persistence.ts';
+
+export interface EditorStartupOptions { initialProject?: Project; browserOnly?: boolean; }
+export async function loadEditorProject(
+  options: EditorStartupOptions = {},
+  dependencies: { request: typeof fetch; draft: () => Promise<Project | null> } = { request: fetch, draft: loadDraft },
+) {
+  if (!options.browserOnly) {
+    try {
+      const response = await dependencies.request('/api/status', { signal: AbortSignal.timeout(1800) });
+      if (response.ok) {
+        const status = await response.json();
+        if (status.forma) {
+          const response = await dependencies.request('/api/project');
+          if (!response.ok) throw Error('Project unavailable');
+          const { project } = await response.json();
+          validateProject(project);
+          return { project: project as Project, status, restored: false };
+        }
+      }
+    } catch {}
+  }
+  try {
+    const project = await dependencies.draft();
+    if (project) {
+      validateProject(project);
+      return { project, status: null, restored: true };
+    }
+  } catch {}
+  const project = clone(options.initialProject || defaultProject());
+  validateProject(project);
+  return { project, status: null, restored: false };
+}