fix raycaster layers, polygon drag, slider undo, and grid events

- Enable EDITOR_LAYER on R3F raycaster for proper hit detection
- Fix polygon editor drag using refs and direct position passing
- Handle pointercancel events and fix pointerId access in polygon editor
- Fix slider undo by reverting to start value before resuming temporal state
- Allow grid:move during camera drag so polygon editor works while panning
- Bump better-auth to ^1.5.2 and turbo to ^2.8.12
- Remove explicit return type on createAuth for better inference

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/auth/src/server.ts

@@ -32,7 +32,7 @@ export interface AuthConfig {
  * - Custom session with activePropertyId
  * - Session cookie caching
  */
-export function createAuth(config: AuthConfig): ReturnType<typeof betterAuth> {
+export function createAuth(config: AuthConfig) {
   return betterAuth({
     appName: config.appName,
     baseURL: config.baseURL,