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/caniuse-lite/dist/unpacker/region.js

@@ -0,0 +1,22 @@
+'use strict'
+
+const browsers = require('./browsers').browsers
+
+function unpackRegion(packed) {
+  return Object.keys(packed).reduce((list, browser) => {
+    let data = packed[browser]
+    list[browsers[browser]] = Object.keys(data).reduce((memo, key) => {
+      let stats = data[key]
+      if (key === '_') {
+        stats.split(' ').forEach(version => (memo[version] = null))
+      } else {
+        memo[key] = stats
+      }
+      return memo
+    }, {})
+    return list
+  }, {})
+}
+
+module.exports = unpackRegion
+module.exports.default = unpackRegion