Complete XYZAC LinuxCNC WASM parity and smooth 3D preview

web/react/src/legacy.d.ts

@@ -3,6 +3,7 @@ declare module "*.mjs" {
   export function loadSimulationCase(options: { path: string; baseUrl?: string }): Promise<{ status: string; entrypoint: string; files: Record<string, string>; missing: string[]; fetched: string[]; state_hash: string; halManifest: unknown[] }>;
   export function toWorkerConfiguration(bundle: unknown): Record<string, unknown>;
   export class SimSession { contextId: string; sessionId: string; constructor(core: unknown); accept(message: unknown): unknown; }
+  export class XyzacSession extends SimSession { authority(): Record<string, unknown>; }
   export class AxisOperationController {
     constructor(client: { send(kind: string, payload?: unknown, operationId?: string): Promise<unknown> });
     execute(kind: string, payload?: Record<string, unknown>, options?: { state?: unknown; action?: string | null; gate?: boolean }): Promise<{ operationId: string; response: unknown; gate: { enabled: boolean; reason: string } }>;