Small fixes for popovers, Intel, and the title bar

A few rough edges smoothed over: a runaway popover, a misleading Intel error message, and a file list that crept into the title bar.

Fixed the error detail popover ballooning to full screen. On wide displays it could stretch to fill the window — it now wraps at a comfortable width.
Fixed Intel tool-launch failures showing up as a misleading “path issue”. A dynamic library error, common on Intel or under Rosetta, was getting swept into a generic message. You now see the real error instead.
Fixed the file list bleeding into the title bar on macOS 15. Rows could scroll up behind the traffic-light buttons — the title bar area now stays clean and matches the list.

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