[Toolkit] Introduce the UX Toolkit ✨

src/Toolkit/.gitattributes

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+/.git* export-ignore
+/.symfony.bundle.yaml export-ignore
+/phpunit.xml.dist export-ignore
+/doc export-ignore
+/tests export-ignore

src/Toolkit/.github/PULL_REQUEST_TEMPLATE.md

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+Please do not submit any Pull Requests here. They will be closed.
+---
+
+Please submit your PR here instead:
+https://github.com/symfony/ux
+
+This repository is what we call a "subtree split": a read-only subset of that main repository.
+We're looking forward to your PR there!

src/Toolkit/.github/workflows/close-pull-request.yml

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+name: Close Pull Request
+
+on:
+  pull_request_target:
+    types: [opened]
+
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: superbrothers/close-pull-request@v3
+        with:
+          comment: |
+            Thanks for your Pull Request! We love contributions.
+            
+            However, you should instead open your PR on the main repository:
+            https://github.com/symfony/ux
+            
+            This repository is what we call a "subtree split": a read-only subset of that main repository.
+            We're looking forward to your PR there!

src/Toolkit/.gitignore

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+vendor
+composer.lock
+.phpunit.result.cache
+var

src/Toolkit/.symfony.bundle.yaml

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+branches: ["2.x"]
+maintained_branches: ["2.x"]
+doc_dir: "doc"

src/Toolkit/CHANGELOG.md

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+# CHANGELOG
+
+## 2.23
+
+-   Component added

src/Toolkit/LICENSE

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+Copyright (c) 2025-present Fabien Potencier
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

src/Toolkit/README.md

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+# Symfony UX Toolkit
+
+**EXPERIMENTAL** This component is currently experimental and is
+likely to change, or even change drastically.
+
+Symfony UX Toolkit provides a set of ready-to-use UI components for Symfony applications.
+
+**This repository is a READ-ONLY sub-tree split**. See
+https://github.com/symfony/ux to create issues or submit pull requests.
+
+## Resources
+
+-   [Documentation](https://symfony.com/bundles/ux-toolkit/current/index.html)
+-   [Report issues](https://github.com/symfony/ux/issues) and
+    [send Pull Requests](https://github.com/symfony/ux/pulls)
+    in the [main Symfony UX repository](https://github.com/symfony/ux)

src/Toolkit/bin/build-registry.php

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+#!/usr/bin/env php
+<?php
+
+// ...

src/Toolkit/composer.json

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+{
+  "name": "symfony/ux-toolkit",
+  "type": "symfony-bundle",
+  "description": "Twig toolkit for Symfony",
+  "keywords": [
+    "symfony-ux",
+    "twig",
+    "components"
+  ],
+  "homepage": "https://symfony.com",
+  "license": "MIT",
+  "authors": [
+    {
+      "name": "Symfony Community",
+      "homepage": "https://symfony.com/contributors"
+    },
+    {
+      "name": "Hugo Alliaume",
+      "email": "[email protected]"
+    },
+    {
+      "name": "Jean-François Lépine",
+      "email": "[email protected]"
+    },
+    {
+      "name": "Simon André",
+      "email": "[email protected]"
+    }
+  ],
+  "require": {
+    "php": ">=8.2",
+    "tales-from-a-dev/twig-tailwind-extra": "^0.3.0",
+    "twig/extra-bundle": "^2.12|^3.0",
+    "twig/html-extra": "^3.19",
+    "twig/twig": "^2.12|^3.0",
+    "symfony/console": "^7.2",
+    "symfony/framework-bundle": "^6.4|^7.0",
+    "symfony/phpunit-bridge": "^6.4|^7.0",
+    "symfony/twig-bundle": "^6.4|^7.0",
+    "symfony/ux-twig-component": "^2.22"
+  },
+  "autoload": {
+    "psr-4": {
+      "Symfony\\Ux\\Toolkit\\": "src"
+    },
+    "exclude-from-classmap": []
+  },
+  "autoload-dev": {
+    "psr-4": {
+      "Symfony\\Ux\\Toolkit\\Tests\\": "tests/"
+    }
+  },
+  "conflict": {
+    "symfony/ux-twig-component": "<2.21"
+  },
+  "extra": {
+    "thanks": {
+      "name": "symfony/ux",
+      "url": "https://github.com/symfony/ux"
+    }
+  },
+  "require-dev": {
+    "symfony/http-client": "6.4|^7.0"
+  }
+}