A line break in a sender's display name can no longer start a header

Shipped: 12 செப்டம்பர், 2026 அன்று 12:27 AM UTC
Author: Kamo
Commit: 2b21a34

Jakarta Mail encodes commas, quotes and non-ASCII in a display name but passes a raw CR/LF through, so displayedAs now flattens control characters to spaces before building the address.

All changes

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