Initialize Black 7 PWA with React, Vite, and app icons

Sets up Vite + React + TypeScript with vite-plugin-pwa for offline support.
Adds app icon (line-drawn 7 on black) in all required sizes with a generation script.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package.json

@@ -0,0 +1,24 @@
+{
+  "name": "black7",
+  "version": "1.0.0",
+  "description": "Scoring app for Last Panther card game",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc && vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "react": "^19.2.6",
+    "react-dom": "^19.2.6"
+  },
+  "devDependencies": {
+    "@types/react": "^19.2.15",
+    "@types/react-dom": "^19.2.3",
+    "@vitejs/plugin-react": "^6.0.2",
+    "typescript": "^5.9.3",
+    "vite": "^8.0.14",
+    "vite-plugin-pwa": "^1.3.0"
+  },
+  "private": true
+}