Make export JSON editable and support updating components via replaced JSON

[utdevnp]

Feature Request

Summary:
Allow users to edit the exported JSON directly. If a user replaces the existing JSON with a new one containing updated components, the changes should be reflected in the application UI and state.

Details:

• When exporting, the JSON should be editable by the user (e.g., in a text area or similar interface).
• If the user pastes or uploads a new/updated JSON, the app should validate and parse it.
• All relevant components and state should update to reflect the new JSON structure and values.
• Handle invalid JSON gracefully with error feedback.

Acceptance Criteria:

• User can view and edit the exported JSON.
• On replacing with a valid JSON that has updated components, the app reflects those updates instantly.
• Errors are shown for invalid JSON.

Benefits:

• Enhances flexibility for power users.
• Supports advanced editing and migration scenarios.