Safari maps the accept attribute's extensions to system file types;
unregistered extensions like .sie/.se grey out valid files in the picker,
making SIE import impossible in Safari. Drop the accept filter and validate
after selection instead. The drag-and-drop path previously ignored
non-matching files silently; both paths now show a visible Swedish error
(with a dedicated hint for zip files) and the server-side filename gate in
/api/import/sie/parse remains as the backstop.
Claude-Session: https://claude.ai/code/session_019xZqhrhqoGLLbsKtCAxyGc
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Mattsson
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