Adds editor option copy as JSON

[aaronzi]

Description of Changes

This PR adds a feature to the editor to copy a Submodel/SubmodelElement as JSON to the clipboard.

[Copilot]

Pull Request Overview

This PR adds a "Copy as JSON" feature to the AAS web UI editor, allowing users to copy Submodel and SubmodelElement objects as JSON to the clipboard. The implementation includes UI integration in the treeview context menus and reuses existing JSON cleaning logic.

• Adds new copyJsonToClipboard function with object cleaning capabilities
• Integrates "Copy as JSON" menu items in both Submodel and SubmodelElement context menus
• Refactors existing JSON view component to use shared cleaning logic

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
ClipboardUtil.ts	Adds copyJsonToClipboard function and cleanObjectRecursively helper for removing tree-specific properties
Treeview.vue	Integrates new copy JSON functionality into context menus for both Submodels and SubmodelElements
SubmodelElementJSONView.vue	Refactors to use shared cleaning logic from ClipboardUtil instead of local implementation

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[Copilot]

The fallback message construction could result in double JSON stringification. If valueName is empty, cleanedValue is stringified twice - once here and once in line 39 where it's copied to clipboard. Consider using a simpler fallback like 'JSON' or the object's modelType property.

Suggested change

	(valueName.trim() !== '' ? valueName : "'" + JSON.stringify(cleanedValue) + "'") +
	(valueName.trim() !== ''
	? valueName
	: (typeof cleanedValue === 'object' && cleanedValue !== null && 'modelType' in cleanedValue
	? (cleanedValue as { modelType?: string }).modelType || 'JSON'
	: 'JSON')) +

[Copilot]

The clipboard write operation should handle potential errors. If the clipboard API fails (e.g., due to permissions or browser compatibility), the user will see the success message despite the operation failing.