fix: default layout resolving

[Z3d0X]

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[what-the-diff]

PR Summary

• New Method Addition in FilamentFabricator File
  A new method named getDefaultLayoutName has been added in the FilamentFabricator file. This method provides a standard approach to handle layout names.

• Implementation of getDefaultLayoutName
  The newly introduced getDefaultLayoutName method is now implemented in the FilamentFabricatorManager file. This adds functionality to the codebase, allowing the new method to be used throughout the program.

• Modification in PageResource File
  The PageResource file is now updated to use the getDefaultLayoutName as the standard value for the layout field in the form. This offers consistency and standardization in handling layout names across various forms.