[IMP] Reliably assign file extensions for pasted clipboard files using MIME mapping

[Che4ter]

Problem:
Images pasted into Markdown notes/summaries lacked file extensions. While they worked in the markdown preview, the missing extensions caused several issues. For example when you want to download them from the datastore or when you include them in reports.

Solution:
Replaced the legacy file naming method with a new get_extension_from_mime() utility. It reads the exact MIME type (e.g., image/png, image/avif) directly from the clipboard blob and maps it to the correct extension. This ensures every pasted image gets the correct file extension.

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