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/nanoid/index.js

@@ -0,0 +1,46 @@
+import crypto from 'crypto'
+import { urlAlphabet } from './url-alphabet/index.js'
+const POOL_SIZE_MULTIPLIER = 128
+let pool, poolOffset
+let fillPool = bytes => {
+  if (bytes < 0 || bytes > 1024) throw new RangeError('Wrong ID size')
+  if (!pool || pool.length < bytes) {
+    pool = Buffer.allocUnsafe(bytes * POOL_SIZE_MULTIPLIER)
+    crypto.randomFillSync(pool)
+    poolOffset = 0
+  } else if (poolOffset + bytes > pool.length) {
+    crypto.randomFillSync(pool)
+    poolOffset = 0
+  }
+  poolOffset += bytes
+}
+let random = bytes => {
+  fillPool((bytes |= 0))
+  return pool.subarray(poolOffset - bytes, poolOffset)
+}
+let customRandom = (alphabet, defaultSize, getRandom) => {
+  let mask = (2 << (31 - Math.clz32((alphabet.length - 1) | 1))) - 1
+  let step = Math.ceil((1.6 * mask * defaultSize) / alphabet.length)
+  return (size = defaultSize) => {
+    let id = ''
+    while (true) {
+      let bytes = getRandom(step)
+      let i = step
+      while (i--) {
+        id += alphabet[bytes[i] & mask] || ''
+        if (id.length === size) return id
+      }
+    }
+  }
+}
+let customAlphabet = (alphabet, size = 21) =>
+  customRandom(alphabet, size, random)
+let nanoid = (size = 21) => {
+  fillPool((size |= 0))
+  let id = ''
+  for (let i = poolOffset - size; i < poolOffset; i++) {
+    id += urlAlphabet[pool[i] & 63]
+  }
+  return id
+}
+export { nanoid, customAlphabet, customRandom, urlAlphabet, random }