diff --git a/apps/widgets_preview/package-lock.json b/apps/widgets_preview/package-lock.json
index 09357ab..ef7b568 100644
--- a/apps/widgets_preview/package-lock.json
+++ b/apps/widgets_preview/package-lock.json
@@ -7,6 +7,11 @@
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+      "version": "29.0.2",
+      "resolved": "https://registry.npmjs.org/jsdom/-/jsdom-29.0.2.tgz",
+      "integrity": "sha512-9VnGEBosc/ZpwyOsJBCQ/3I5p7Q5ngOY14a9bf5btenAORmZfDse1ZEheMiWcJ3h81+Fv7HmJFdS0szo/waF2w==",
       "dev": true,
       "license": "MIT",
       "peer": true,
       "dependencies": {
-        "@asamuzakjp/css-color": "^5.0.1",
-        "@asamuzakjp/dom-selector": "^7.0.3",
+        "@asamuzakjp/css-color": "^5.1.5",
+        "@asamuzakjp/dom-selector": "^7.0.6",
         "@bramus/specificity": "^2.4.2",
         "@csstools/css-syntax-patches-for-csstree": "^1.1.1",
         "@exodus/bytes": "^1.15.0",
@@ -1622,9 +1635,9 @@
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-      "version": "11.2.7",
-      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-11.2.7.tgz",
-      "integrity": "sha512-aY/R+aEsRelme17KGQa/1ZSIpLpNYYrhcrepKTZgE+W3WM16YMCaPwOHLHsmopZHELU0Ojin1lPVxKR0MihncA==",
+      "version": "11.3.5",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-11.3.5.tgz",
+      "integrity": "sha512-NxVFwLAnrd9i7KUBxC4DrUhmgjzOs+1Qm50D3oF1/oL+r1NpZ4gA7xvG0/zJ8evR7zIKn4vLf7qTNduWFtCrRw==",
       "dev": true,
       "license": "BlueOak-1.0.0",
       "engines": {
@@ -1678,8 +1691,6 @@
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-      "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.3.11.tgz",
-      "integrity": "sha512-N8SpfPUnUp1bK+PMYW8qSWdl9U+wwNWI4QKxOYDy9JAro3WMX7p2OeVRF9v+347pnakNevPmiHhNmZ2HbFA76w==",
       "dev": true,
       "funding": [
         {
@@ -1728,15 +1739,11 @@
     },
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       "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.1.1.tgz",
-      "integrity": "sha512-xceH2snhtb5M9liqDsmEw56le376mTZkEX/jEb/RxNFyegNul7eNslCXP9FDj/Lcu0X8KEyMceP2ntpaHrDEVA==",
       "dev": true,
       "license": "ISC"
     },
     "node_modules/picomatch": {
-      "version": "4.0.3",
-      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.3.tgz",
-      "integrity": "sha512-5gTmgEY/sqK6gFXLIsQNH19lWb4ebPDLA4SdLP7dsWkIXHWlG66oPuVvXSGFPppYZz8ZDZq0dYYrbHfBCVUb1Q==",
+      "version": "4.0.4",
       "dev": true,
       "license": "MIT",
       "peer": true,
@@ -1748,9 +1755,7 @@
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     },
     "node_modules/postcss": {
-      "version": "8.5.8",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.8.tgz",
-      "integrity": "sha512-OW/rX8O/jXnm82Ey1k44pObPtdblfiuWnrd8X7GJ7emImCOstunGbXUpp7HdBrFQX6rJzn3sPT397Wp5aCwCHg==",
+      "version": "8.5.10",
       "dev": true,
       "funding": [
         {
@@ -1797,9 +1802,7 @@
       }
     },
     "node_modules/rollup": {
-      "version": "4.59.0",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-4.59.0.tgz",
-      "integrity": "sha512-2oMpl67a3zCH9H79LeMcbDhXW/UmWG/y2zuqnF2jQq5uq9TbM9TVyXvA4+t+ne2IIkBdrLpAaRQAvo7YI/Yyeg==",
+      "version": "4.60.1",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -1813,31 +1816,31 @@
         "npm": ">=8.0.0"
       },
       "optionalDependencies": {
-        "@rollup/rollup-android-arm-eabi": "4.59.0",
-        "@rollup/rollup-android-arm64": "4.59.0",
-        "@rollup/rollup-darwin-arm64": "4.59.0",
-        "@rollup/rollup-darwin-x64": "4.59.0",
-        "@rollup/rollup-freebsd-arm64": "4.59.0",
-        "@rollup/rollup-freebsd-x64": "4.59.0",
-        "@rollup/rollup-linux-arm-gnueabihf": "4.59.0",
-        "@rollup/rollup-linux-arm-musleabihf": "4.59.0",
-        "@rollup/rollup-linux-arm64-gnu": "4.59.0",
-        "@rollup/rollup-linux-arm64-musl": "4.59.0",
-        "@rollup/rollup-linux-loong64-gnu": "4.59.0",
-        "@rollup/rollup-linux-loong64-musl": "4.59.0",
-        "@rollup/rollup-linux-ppc64-gnu": "4.59.0",
-        "@rollup/rollup-linux-ppc64-musl": "4.59.0",
-        "@rollup/rollup-linux-riscv64-gnu": "4.59.0",
-        "@rollup/rollup-linux-riscv64-musl": "4.59.0",
-        "@rollup/rollup-linux-s390x-gnu": "4.59.0",
-        "@rollup/rollup-linux-x64-gnu": "4.59.0",
-        "@rollup/rollup-linux-x64-musl": "4.59.0",
-        "@rollup/rollup-openbsd-x64": "4.59.0",
-        "@rollup/rollup-openharmony-arm64": "4.59.0",
-        "@rollup/rollup-win32-arm64-msvc": "4.59.0",
-        "@rollup/rollup-win32-ia32-msvc": "4.59.0",
-        "@rollup/rollup-win32-x64-gnu": "4.59.0",
-        "@rollup/rollup-win32-x64-msvc": "4.59.0",
+        "@rollup/rollup-android-arm-eabi": "4.60.1",
+        "@rollup/rollup-android-arm64": "4.60.1",
+        "@rollup/rollup-darwin-arm64": "4.60.1",
+        "@rollup/rollup-darwin-x64": "4.60.1",
+        "@rollup/rollup-freebsd-arm64": "4.60.1",
+        "@rollup/rollup-freebsd-x64": "4.60.1",
+        "@rollup/rollup-linux-arm-gnueabihf": "4.60.1",
+        "@rollup/rollup-linux-arm-musleabihf": "4.60.1",
+        "@rollup/rollup-linux-arm64-gnu": "4.60.1",
+        "@rollup/rollup-linux-arm64-musl": "4.60.1",
+        "@rollup/rollup-linux-loong64-gnu": "4.60.1",
+        "@rollup/rollup-linux-loong64-musl": "4.60.1",
+        "@rollup/rollup-linux-ppc64-gnu": "4.60.1",
+        "@rollup/rollup-linux-ppc64-musl": "4.60.1",
+        "@rollup/rollup-linux-riscv64-gnu": "4.60.1",
+        "@rollup/rollup-linux-riscv64-musl": "4.60.1",
+        "@rollup/rollup-linux-s390x-gnu": "4.60.1",
+        "@rollup/rollup-linux-x64-gnu": "4.60.1",
+        "@rollup/rollup-linux-x64-musl": "4.60.1",
+        "@rollup/rollup-openbsd-x64": "4.60.1",
+        "@rollup/rollup-openharmony-arm64": "4.60.1",
+        "@rollup/rollup-win32-arm64-msvc": "4.60.1",
+        "@rollup/rollup-win32-ia32-msvc": "4.60.1",
+        "@rollup/rollup-win32-x64-gnu": "4.60.1",
+        "@rollup/rollup-win32-x64-msvc": "4.60.1",
         "fsevents": "~2.3.2"
       }
     },
@@ -1876,8 +1879,6 @@
     },
     "node_modules/source-map-js": {
       "version": "1.2.1",
-      "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.1.tgz",
-      "integrity": "sha512-UXWMKhLOwVKb728IUtQPXxfYU+usdybtUrK/8uGE8CQMvrhOpwvzDBwj0QhSL7MQc7vIsISBG8VQ8+IDQxpfQA==",
       "dev": true,
       "license": "BSD-3-Clause",
       "engines": {
@@ -1892,9 +1893,9 @@
       "license": "MIT"
     },
     "node_modules/std-env": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/std-env/-/std-env-4.0.0.tgz",
-      "integrity": "sha512-zUMPtQ/HBY3/50VbpkupYHbRroTRZJPRLvreamgErJVys0ceuzMkD44J/QjqhHjOzK42GQ3QZIeFG1OYfOtKqQ==",
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/std-env/-/std-env-4.1.0.tgz",
+      "integrity": "sha512-Rq7ybcX2RuC55r9oaPVEW7/xu3tj8u4GeBYHBWCychFtzMIr86A7e3PPEBPT37sHStKX3+TiX/Fr/ACmJLVlLQ==",
       "dev": true,
       "license": "MIT"
     },
@@ -1918,6 +1919,11 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/tap-burst-web-component": {
+      "version": "1.0.0+1",
+      "resolved": "file:../tap_burst_web_component/build/web/tap-burst-web-component.tgz",
+      "integrity": "sha512-Ki7SHGgroK1r3w4k8t3zgDxxq6CELS5HMwQQbIQAiIyy2tF8FynFfQ3DeTshwIhO8tfz76SGk/H+5d4l3NsOBQ=="
+    },
     "node_modules/tinybench": {
       "version": "2.9.0",
       "resolved": "https://registry.npmjs.org/tinybench/-/tinybench-2.9.0.tgz",
@@ -1926,9 +1932,9 @@
       "license": "MIT"
     },
     "node_modules/tinyexec": {
-      "version": "1.0.4",
-      "resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-1.0.4.tgz",
-      "integrity": "sha512-u9r3uZC0bdpGOXtlxUIdwf9pkmvhqJdrVCH9fapQtgy/OeTTMZ1nqH7agtvEfmGui6e1XxjcdrlxvxJvc3sMqw==",
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-1.1.1.tgz",
+      "integrity": "sha512-VKS/ZaQhhkKFMANmAOhhXVoIfBXblQxGX1myCQ2faQrfmobMftXeJPcZGp0gS07ocvGJWDLZGyOZDadDBqYIJg==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -1936,14 +1942,12 @@
       }
     },
     "node_modules/tinyglobby": {
-      "version": "0.2.15",
-      "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.15.tgz",
-      "integrity": "sha512-j2Zq4NyQYG5XMST4cbs02Ak8iJUdxRM0XI5QyxXuZOzKOINmWurp3smXu3y5wDcJrptwpSjgXHzIQxR0omXljQ==",
+      "version": "0.2.16",
       "dev": true,
       "license": "MIT",
       "dependencies": {
         "fdir": "^6.5.0",
-        "picomatch": "^4.0.3"
+        "picomatch": "^4.0.4"
       },
       "engines": {
         "node": ">=12.0.0"
@@ -1963,22 +1967,22 @@
       }
     },
     "node_modules/tldts": {
-      "version": "7.0.27",
-      "resolved": "https://registry.npmjs.org/tldts/-/tldts-7.0.27.tgz",
-      "integrity": "sha512-I4FZcVFcqCRuT0ph6dCDpPuO4Xgzvh+spkcTr1gK7peIvxWauoloVO0vuy1FQnijT63ss6AsHB6+OIM4aXHbPg==",
+      "version": "7.0.28",
+      "resolved": "https://registry.npmjs.org/tldts/-/tldts-7.0.28.tgz",
+      "integrity": "sha512-+Zg3vWhRUv8B1maGSTFdev9mjoo8Etn2Ayfs4cnjlD3CsGkxXX4QyW3j2WJ0wdjYcYmy7Lx2RDsZMhgCWafKIw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "tldts-core": "^7.0.27"
+        "tldts-core": "^7.0.28"
       },
       "bin": {
         "tldts": "bin/cli.js"
       }
     },
     "node_modules/tldts-core": {
-      "version": "7.0.27",
-      "resolved": "https://registry.npmjs.org/tldts-core/-/tldts-core-7.0.27.tgz",
-      "integrity": "sha512-YQ7uPjgWUibIK6DW5lrKujGwUKhLevU4hcGbP5O6TcIUb+oTjJYJVWPS4nZsIHrEEEG6myk/oqAJUEQmpZrHsg==",
+      "version": "7.0.28",
+      "resolved": "https://registry.npmjs.org/tldts-core/-/tldts-core-7.0.28.tgz",
+      "integrity": "sha512-7W5Efjhsc3chVdFhqtaU0KtK32J37Zcr9RKtID54nG+tIpcY79CQK/veYPODxtD/LJ4Lue66jvrQzIX2Z2/pUQ==",
       "dev": true,
       "license": "MIT"
     },
@@ -2010,8 +2014,6 @@
     },
     "node_modules/typescript": {
       "version": "5.7.3",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.7.3.tgz",
-      "integrity": "sha512-84MVSjMEHP+FQRPy3pX9sTVV/INIex71s9TL2Gm5FG/WG1SqXeKyZ0k7/blY/4FdOzI12CBy1vGc4og/eus0fw==",
       "dev": true,
       "license": "Apache-2.0",
       "bin": {
@@ -2023,9 +2025,9 @@
       }
     },
     "node_modules/undici": {
-      "version": "7.24.5",
-      "resolved": "https://registry.npmjs.org/undici/-/undici-7.24.5.tgz",
-      "integrity": "sha512-3IWdCpjgxp15CbJnsi/Y9TCDE7HWVN19j1hmzVhoAkY/+CJx449tVxT5wZc1Gwg8J+P0LWvzlBzxYRnHJ+1i7Q==",
+      "version": "7.25.0",
+      "resolved": "https://registry.npmjs.org/undici/-/undici-7.25.0.tgz",
+      "integrity": "sha512-xXnp4kTyor2Zq+J1FfPI6Eq3ew5h6Vl0F/8d9XU5zZQf1tX9s2Su1/3PiMmUANFULpmksxkClamIZcaUqryHsQ==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -2033,16 +2035,12 @@
       }
     },
     "node_modules/undici-types": {
-      "version": "7.18.2",
-      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.18.2.tgz",
-      "integrity": "sha512-AsuCzffGHJybSaRrmr5eHr81mwJU3kjw6M+uprWvCXiNeN9SOGwQ3Jn8jb8m3Z6izVgknn1R0FTCEAP2QrLY/w==",
+      "version": "7.19.2",
       "dev": true,
       "license": "MIT"
     },
     "node_modules/vite": {
-      "version": "6.4.1",
-      "resolved": "https://registry.npmjs.org/vite/-/vite-6.4.1.tgz",
-      "integrity": "sha512-+Oxm7q9hDoLMyJOYfUYBuHQo+dkAloi33apOPP56pzj+vsdJDzr+j1NISE5pyaAuKL4A3UD34qd0lx5+kfKp2g==",
+      "version": "6.4.2",
       "dev": true,
       "license": "MIT",
       "peer": true,
@@ -2116,20 +2114,20 @@
       }
     },
     "node_modules/vitest": {
-      "version": "4.1.0",
-      "resolved": "https://registry.npmjs.org/vitest/-/vitest-4.1.0.tgz",
-      "integrity": "sha512-YbDrMF9jM2Lqc++2530UourxZHmkKLxrs4+mYhEwqWS97WJ7wOYEkcr+QfRgJ3PW9wz3odRijLZjHEaRLTNbqw==",
+      "version": "4.1.4",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-4.1.4.tgz",
+      "integrity": "sha512-tFuJqTxKb8AvfyqMfnavXdzfy3h3sWZRWwfluGbkeR7n0HUev+FmNgZ8SDrRBTVrVCjgH5cA21qGbCffMNtWvg==",
       "dev": true,
       "license": "MIT",
       "peer": true,
       "dependencies": {
-        "@vitest/expect": "4.1.0",
-        "@vitest/mocker": "4.1.0",
-        "@vitest/pretty-format": "4.1.0",
-        "@vitest/runner": "4.1.0",
-        "@vitest/snapshot": "4.1.0",
-        "@vitest/spy": "4.1.0",
-        "@vitest/utils": "4.1.0",
+        "@vitest/expect": "4.1.4",
+        "@vitest/mocker": "4.1.4",
+        "@vitest/pretty-format": "4.1.4",
+        "@vitest/runner": "4.1.4",
+        "@vitest/snapshot": "4.1.4",
+        "@vitest/spy": "4.1.4",
+        "@vitest/utils": "4.1.4",
         "es-module-lexer": "^2.0.0",
         "expect-type": "^1.3.0",
         "magic-string": "^0.30.21",
@@ -2140,8 +2138,8 @@
         "tinybench": "^2.9.0",
         "tinyexec": "^1.0.2",
         "tinyglobby": "^0.2.15",
-        "tinyrainbow": "^3.0.3",
-        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0-0",
+        "tinyrainbow": "^3.1.0",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0",
         "why-is-node-running": "^2.3.0"
       },
       "bin": {
@@ -2157,13 +2155,15 @@
         "@edge-runtime/vm": "*",
         "@opentelemetry/api": "^1.9.0",
         "@types/node": "^20.0.0 || ^22.0.0 || >=24.0.0",
-        "@vitest/browser-playwright": "4.1.0",
-        "@vitest/browser-preview": "4.1.0",
-        "@vitest/browser-webdriverio": "4.1.0",
-        "@vitest/ui": "4.1.0",
+        "@vitest/browser-playwright": "4.1.4",
+        "@vitest/browser-preview": "4.1.4",
+        "@vitest/browser-webdriverio": "4.1.4",
+        "@vitest/coverage-istanbul": "4.1.4",
+        "@vitest/coverage-v8": "4.1.4",
+        "@vitest/ui": "4.1.4",
         "happy-dom": "*",
         "jsdom": "*",
-        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0-0"
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0"
       },
       "peerDependenciesMeta": {
         "@edge-runtime/vm": {
@@ -2184,6 +2184,12 @@
         "@vitest/browser-webdriverio": {
           "optional": true
         },
+        "@vitest/coverage-istanbul": {
+          "optional": true
+        },
+        "@vitest/coverage-v8": {
+          "optional": true
+        },
         "@vitest/ui": {
           "optional": true
         },
diff --git a/apps/widgets_preview/package.json b/apps/widgets_preview/package.json
index 6f573a0..4f07e93 100644
--- a/apps/widgets_preview/package.json
+++ b/apps/widgets_preview/package.json
@@ -4,9 +4,10 @@
   "private": true,
   "type": "module",
   "scripts": {
-    "predev": "node scripts/build-flutter.mjs",
+    "build-flutter-packages": "node ../../tool/build-flutter-packages.mjs",
+    "predev": "node ../../tool/build-flutter-packages.mjs",
     "dev": "vite",
-    "prebuild": "node scripts/build-flutter.mjs",
+    "prebuild": "node ../../tool/build-flutter-packages.mjs",
     "build": "vite build",
     "preview": "vite preview",
     "test": "vitest run",
@@ -19,5 +20,10 @@
     "typescript": "~5.7.0",
     "vite": "^6.0.0",
     "vitest": "^4.1.0"
+  },
+  "dependencies": {
+    "color-mixer-web-component": "file:../color_mixer_web_component/build/web/color-mixer-web-component.tgz",
+    "tap-burst-web-component": "file:../tap_burst_web_component/build/web/tap-burst-web-component.tgz",
+    "flutter-bootstrap": "file:../../packages/flutter_bootstrap/build/web/flutter-bootstrap.tgz"
   }
 }
diff --git a/apps/widgets_preview/scripts/build-flutter.mjs b/apps/widgets_preview/scripts/build-flutter.mjs
deleted file mode 100644
index 33b245c..0000000
--- a/apps/widgets_preview/scripts/build-flutter.mjs
+++ /dev/null
@@ -1,65 +0,0 @@
-/**
- * Builds each Flutter package and copies the output into the corresponding
- * public/ subdirectory so Vite serves it at the right base path.
- *
- *   packages/flutter_bootstrap        →  public/flutter-bootstrap/ (/flutter-bootstrap/)
- *   apps/tap_burst_web_component      →  public/tap-burst/         (/tap-burst/)
- *   apps/color_mixer_web_component    →  public/color-mixer/       (/color-mixer/)
- *
- * The flutter_bootstrap package is built first: its flutter_bootstrap.js
- * provides the shared Flutter engine loader (_flutter / _flutter.loader).
- *
- * Uses the FVM-managed Flutter SDK when available, falls back to `flutter`
- * on PATH otherwise.
- *
- * Usage: node scripts/build-flutter.mjs
- */
-
-import { execSync } from 'node:child_process';
-import { existsSync, mkdirSync, rmSync } from 'node:fs';
-import { dirname, join } from 'node:path';
-import { fileURLToPath } from 'node:url';
-
-const root = dirname(fileURLToPath(import.meta.url));
-const projectRoot = join(root, '..');
-const repoRoot = join(projectRoot, '..', '..');
-
-const fvmBin = join(repoRoot, '.fvm', 'flutter_sdk', 'bin', 'flutter');
-const flutterBin = existsSync(fvmBin) ? fvmBin : 'flutter';
-
-const widgets = [
-  // Built first: provides the shared Flutter engine loader (flutter_bootstrap.js).
-  {
-    name: 'flutter_bootstrap',
-    src: join(repoRoot, 'packages', 'flutter_bootstrap'),
-    dest: join(projectRoot, 'public', 'flutter-bootstrap'),
-  },
-  {
-    name: 'tap_burst_web_component',
-    src: join(repoRoot, 'apps', 'tap_burst_web_component'),
-    dest: join(projectRoot, 'public', 'tap-burst'),
-  },
-  {
-    name: 'color_mixer_web_component',
-    src: join(repoRoot, 'apps', 'color_mixer_web_component'),
-    dest: join(projectRoot, 'public', 'color-mixer'),
-  },
-];
-
-for (const widget of widgets) {
-  if (!existsSync(widget.src)) {
-    console.error(`✗  Source not found: ${widget.src}`);
-    process.exit(1);
-  }
-  console.log(`\n▶  Building ${widget.name}…`);
-  // Use the --web-output or --output option to build directly into widget.dest
-  // (web support: --web-output is old, --output is new as of Flutter 3.10+)
-  if (existsSync(widget.dest)) rmSync(widget.dest, { recursive: true });
-  mkdirSync(widget.dest, { recursive: true });
-  execSync(
-    `"${flutterBin}" build web --output "${widget.dest}"`,
-    { cwd: widget.src, stdio: 'inherit' }
-  );
-
-  console.log(`✓  ${widget.name} ready`);
-}
diff --git a/apps/widgets_preview/src/main.test.ts b/apps/widgets_preview/src/main.test.ts
index 7473fb6..d168961 100644
--- a/apps/widgets_preview/src/main.test.ts
+++ b/apps/widgets_preview/src/main.test.ts
@@ -872,7 +872,7 @@ describe('main', () => {
     const mainPromise = mainFn();
     await Promise.resolve();
     const script = document.head.querySelector(
-      'script[src="/flutter-bootstrap/flutter_bootstrap.js"]',
+      'script[src="./node_modules/flutter-bootstrap/flutter_bootstrap.js"]',
     ) as HTMLScriptElement;
     script.onload!(new Event('load'));
     await mainPromise;
@@ -888,7 +888,7 @@ describe('main', () => {
 
     expect(
       document.head.querySelector(
-        'script[src="/flutter-bootstrap/flutter_bootstrap.js"]',
+        'script[src="./node_modules/flutter-bootstrap/flutter_bootstrap.js"]',
       ),
     ).not.toBeNull();
   });
@@ -905,8 +905,8 @@ describe('main', () => {
     addBtn.click();
     await vi.waitFor(() =>
       expect(vi.mocked(getFlutterApp)).toHaveBeenCalledWith(
-        '/tap-burst/',
-        '/tap-burst/',
+        '/node_modules/tap-burst-web-component/',
+        '/node_modules/tap-burst-web-component/',
       ),
     );
   });
@@ -915,7 +915,7 @@ describe('main', () => {
     const { getFlutterApp } = await import('./custom_bootstrap');
     vi.mocked(getFlutterApp).mockImplementation(
       async (basePath: string) =>
-        basePath === '/color-mixer/' ? makeColorMixerApp() : makeTapBurstApp(),
+        basePath === '/node_modules/color-mixer-web-component/' ? makeColorMixerApp() : makeTapBurstApp(),
     );
 
     await runMain();
@@ -926,8 +926,8 @@ describe('main', () => {
     addBtn.click();
     await vi.waitFor(() =>
       expect(vi.mocked(getFlutterApp)).toHaveBeenCalledWith(
-        '/color-mixer/',
-        '/color-mixer/',
+        '/node_modules/color-mixer-web-component/',
+        '/node_modules/color-mixer-web-component/',
       ),
     );
   });
diff --git a/apps/widgets_preview/src/main.ts b/apps/widgets_preview/src/main.ts
index d026eb6..215336f 100644
--- a/apps/widgets_preview/src/main.ts
+++ b/apps/widgets_preview/src/main.ts
@@ -305,8 +305,8 @@ export async function addView(
   let viewId!: number;
   const stateReadyHandler: ((e: Event) => void) | null = onStateReady
     ? (e: Event) => {
-        onStateReady((e as CustomEvent).detail, wrapper, initialData);
-      }
+      onStateReady((e as CustomEvent).detail, wrapper, initialData);
+    }
     : null;
   if (stateReadyHandler) {
     host.addEventListener(stateReadyEventName, stateReadyHandler, { once: true });
@@ -391,11 +391,11 @@ export function wireColorMixerConfigPreview(): void {
 
 export async function main(): Promise<void> {
   wireColorMixerConfigPreview();
-  await loadScript('/flutter-bootstrap/flutter_bootstrap.js');
+  await loadScript('./node_modules/flutter-bootstrap/flutter_bootstrap.js');
 
   const widgets = [
     {
-      basePath: '/tap-burst/',
+      basePath: '/node_modules/tap-burst-web-component/',
       widgetName: 'tap_burst',
       viewsId: 'tap-burst-views',
       addId: 'tap-burst-add',
@@ -408,7 +408,7 @@ export async function main(): Promise<void> {
       },
     },
     {
-      basePath: '/color-mixer/',
+      basePath: '/node_modules/color-mixer-web-component/',
       widgetName: 'color_mixer',
       viewsId: 'color-mixer-views',
       addId: 'color-mixer-add',
diff --git a/apps/widgets_preview/vite.config.ts b/apps/widgets_preview/vite.config.ts
index 1b83d59..1677704 100644
--- a/apps/widgets_preview/vite.config.ts
+++ b/apps/widgets_preview/vite.config.ts
@@ -1,5 +1,20 @@
+import { createReadStream, existsSync, statSync } from 'node:fs';
+import { join } from 'node:path';
 import { defineConfig } from 'vitest/config';
 
+/** Flutter packages served as raw static assets, bypassing Vite's transform pipeline. */
+const FLUTTER_PACKAGES = [
+  'flutter-bootstrap',
+  'tap-burst-web-component',
+  'color-mixer-web-component',
+];
+
+const CONTENT_TYPES: Record<string, string> = {
+  js: 'application/javascript',
+  wasm: 'application/wasm',
+  json: 'application/json',
+};
+
 export default defineConfig({
   server: {
     port: 3000,
@@ -16,4 +31,27 @@ export default defineConfig({
       exclude: ['src/**/*.test.ts', 'src/vite-env.d.ts'],
     },
   },
+  plugins: [
+    {
+      // Serve Flutter package assets directly, before Vite's transform middleware.
+      // dart2js output contains dynamic import() calls that trigger Vite's
+      // importAnalysis to inject `import {injectQuery} from "/@vite/client"`,
+      // which breaks classic-script loading used by the Flutter bootstrap.
+      name: 'flutter-static-assets',
+      configureServer(server) {
+        server.middlewares.use((req, res, next) => {
+          const pathname = (req.url ?? '').split('?')[0];
+          const isFlutterPkg = FLUTTER_PACKAGES.some(
+            (pkg) => pathname.startsWith(`/node_modules/${pkg}/`),
+          );
+          if (!isFlutterPkg) return next();
+          const filepath = join(process.cwd(), pathname);
+          if (!existsSync(filepath) || !statSync(filepath).isFile()) return next();
+          const ext = pathname.split('.').pop() ?? '';
+          res.setHeader('Content-Type', CONTENT_TYPES[ext] ?? 'application/octet-stream');
+          createReadStream(filepath).pipe(res);
+        });
+      },
+    },
+  ],
 });