fix: bind FrontendConfig to return 'vue' framework in ThemesConfigTes…

[roble]

This pull request updates the ThemesConfigTest to mock the FrontendConfig service, ensuring that the getFramework() method always returns 'vue' during tests. This helps to make the tests more predictable and independent of the actual frontend configuration.

Test configuration improvements:

• Added a binding in the test setup to override the FrontendConfig service, forcing getFramework() to return 'vue' for all tests in ThemesConfigTest.php.
• Imported the FrontendConfig class at the top of the test file to support the new binding.

[Copilot]

Pull request overview

This pull request makes ThemesConfigTest more deterministic by overriding the FrontendConfig service in the test container so that getFramework() always resolves to 'vue', removing dependency on the real frontend configuration during these feature tests.

Changes:

• Import App\Services\FrontendConfig in ThemesConfigTest.php.
• Bind FrontendConfig in setUp() to an override implementation returning 'vue' from getFramework().

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