🐛 Fix DataCloneError in plugin postMessage communication

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Fixes a crash where plugins sending messages via 'penpot.ui.sendMessage()'
could fail if their message payload contained non-serializable values like
functions or closures.

The fix adds validation using 'structuredClone()' to catch these messages
early with a helpful error message, and adds a defensive try/catch in the
modal's message handler as a safety net.

Fixes the error: 'Failed to execute postMessage on Window: ... could not
be cloned.'

Signed-off-by: Andrey Antukh <niwi@niwi.nz>

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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f