[BUG] Copy feature for diagrams does not work with Safari browser

[uklasing]

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What type of issue are you facing

bug report

Describe the bug

apparently the png copy feature does not work as expected using Safari on macOS (tested with Version 18.6 (20621.3.11.11.3)) on macOS Sequoia 15.6.1.

Instead of pasting the png file former clipboard content will be pasted...

Expected Behavior

a bitmap based on the png respresentation of the draw.io architecture diagram is pasted into the target location if the receiving software supports .png format

Steps To Reproduce

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Additional context

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