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/postcss/lib/parse.js

@@ -0,0 +1,42 @@
+'use strict'
+
+let Container = require('./container')
+let Input = require('./input')
+let Parser = require('./parser')
+
+function parse(css, opts) {
+  let input = new Input(css, opts)
+  let parser = new Parser(input)
+  try {
+    parser.parse()
+  } catch (e) {
+    if (process.env.NODE_ENV !== 'production') {
+      if (e.name === 'CssSyntaxError' && opts && opts.from) {
+        if (/\.scss$/i.test(opts.from)) {
+          e.message +=
+            '\nYou tried to parse SCSS with ' +
+            'the standard CSS parser; ' +
+            'try again with the postcss-scss parser'
+        } else if (/\.sass/i.test(opts.from)) {
+          e.message +=
+            '\nYou tried to parse Sass with ' +
+            'the standard CSS parser; ' +
+            'try again with the postcss-sass parser'
+        } else if (/\.less$/i.test(opts.from)) {
+          e.message +=
+            '\nYou tried to parse Less with ' +
+            'the standard CSS parser; ' +
+            'try again with the postcss-less parser'
+        }
+      }
+    }
+    throw e
+  }
+
+  return parser.root
+}
+
+module.exports = parse
+parse.default = parse
+
+Container.registerParse(parse)