portrait-only: drop landscape rotate prompt + lock to portrait

- Remove RotatePrompt (the "rotate to landscape" overlay) — the app is portrait
  now, so it only blocked the UI.
- page.tsx: best-effort orientation lock switched landscape → portrait.
- Add Playwright-based store-screenshot + icon scripts (scripts/shots.js,
  game.js, icon.js); generated images are gitignored.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

package-lock.json

@@ -31,6 +31,7 @@
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         "eslint": "^9",
         "eslint-config-next": "16.2.7",
+        "playwright": "^1.60.0",
         "tailwindcss": "^4",
         "typescript": "^5"
       }
@@ -4223,6 +4224,21 @@
         "node": ">= 10.0.0"
       }
     },
+    "node_modules/fsevents": {
+      "version": "2.3.2",
+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.2.tgz",
+      "integrity": "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==",
+      "dev": true,
+      "hasInstallScript": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
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+    },
     "node_modules/function-bind": {
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@@ -6254,6 +6270,38 @@
         "url": "https://github.com/sponsors/jonschlinkert"
       }
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+    "node_modules/playwright": {
+      "version": "1.60.0",
+      "resolved": "https://registry.npmjs.org/playwright/-/playwright-1.60.0.tgz",
+      "integrity": "sha512-hheHdokM8cdqCb0lcE3s+zT4t4W+vvjpGxsZlDnikarzx8tSzMebh3UiFtgqwFwnTnjYQcsyMF8ei2mCO/tpeA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "playwright-core": "1.60.0"
+      },
+      "bin": {
+        "playwright": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "optionalDependencies": {
+        "fsevents": "2.3.2"
+      }
+    },
+    "node_modules/playwright-core": {
+      "version": "1.60.0",
+      "resolved": "https://registry.npmjs.org/playwright-core/-/playwright-core-1.60.0.tgz",
+      "integrity": "sha512-9bW6zvX/m0lEbgTKJ6YppOKx8H3VOPBMOCFh2irXFOT4BbHgrx5hPjwJYLT40Lu+4qtD36qKc/Hn56StUW57IA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "playwright-core": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/plist": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/plist/-/plist-3.1.1.tgz",