Fixes resetting of form inputs in the BaSyx Editor

[aaronzi]

This pull request improves the initialization logic of several form components in the app by ensuring that form fields are always reset before loading data. This prevents stale data from appearing when editing or creating new items. Additionally, the assignment of form field values has been streamlined using nullish coalescing (??) to provide default values where appropriate, resulting in cleaner and more robust code.

Form state management improvements:

• Added a resetFormValues (or clearForm) function to each form component (such as AASForm.vue, BlobForm.vue, CollectionForm.vue, EntityForm.vue, FileForm.vue, ListForm.vue, MLPForm.vue, and PropertyForm.vue) to explicitly reset all form fields to their default values before initializing input values. This ensures no stale data remains from previously opened forms. [1] [2] [3] [4] [5] [6] [7] [8]

Streamlined and safer value assignment:

• Updated the logic for assigning values from loaded objects to form fields to use the nullish coalescing operator (??) to provide sensible defaults (e.g., null, empty string, or specific enum values) if the loaded data is missing or undefined. This makes the code more concise and robust against incomplete data. [1] [2] [3] [4] [5] [6] [7]

These changes collectively improve the user experience by ensuring form data is always current and consistent, and they also simplify and harden the codebase against edge cases involving missing or undefined data.