feat: V1 prototype — Vite/React/TS tileset generator

- Scaffold: package.json, tsconfig.json, vite.config.ts, index.html
- src/lib/imageProcessor.ts: full pipeline (normalize, offset, seam repair, export, validation)
- src/components/UploadPanel.tsx: drag-and-drop, file picker, clipboard paste
- src/components/SettingsPanel.tsx: all controls per spec
- src/components/PreviewPanel.tsx: Original / Tileable / Repeated tabs
- src/components/ErrorBanner.tsx: dismissible error/warning banners
- src/App.tsx: root component wiring everything together
- src/index.css: dark premium glassmorphism theme w/ Inter font

node_modules/@babel/helper-validator-identifier/README.md

@@ -0,0 +1,19 @@
+# @babel/helper-validator-identifier
+
+> Validate identifier/keywords name
+
+See our website [@babel/helper-validator-identifier](https://babeljs.io/docs/babel-helper-validator-identifier) for more information.
+
+## Install
+
+Using npm:
+
+```sh
+npm install --save @babel/helper-validator-identifier
+```
+
+or using yarn:
+
+```sh
+yarn add @babel/helper-validator-identifier
+```