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/.vite/deps/react-dom_client.js

@@ -0,0 +1,38 @@
+import {
+  require_react_dom
+} from "./chunk-HCIN4FJ4.js";
+import {
+  __commonJS
+} from "./chunk-REFQX4J5.js";
+
+// node_modules/react-dom/client.js
+var require_client = __commonJS({
+  "node_modules/react-dom/client.js"(exports) {
+    var m = require_react_dom();
+    if (false) {
+      exports.createRoot = m.createRoot;
+      exports.hydrateRoot = m.hydrateRoot;
+    } else {
+      i = m.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
+      exports.createRoot = function(c, o) {
+        i.usingClientEntryPoint = true;
+        try {
+          return m.createRoot(c, o);
+        } finally {
+          i.usingClientEntryPoint = false;
+        }
+      };
+      exports.hydrateRoot = function(c, h, o) {
+        i.usingClientEntryPoint = true;
+        try {
+          return m.hydrateRoot(c, h, o);
+        } finally {
+          i.usingClientEntryPoint = false;
+        }
+      };
+    }
+    var i;
+  }
+});
+export default require_client();
+//# sourceMappingURL=react-dom_client.js.map