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MimePart: quote an encoded display name only when it could be re-parsed (#107)

whenever it contained anything outside RFC 2822 atext. Every accented letter
is outside atext, so every non-ASCII name was quoted, and because the quotes
land inside the base64 payload, clients showed them as part of the name:
"Objednávky domena.cz" instead of Objednávky domena.cz.

Per RFC 2047 §6.2 an encoded-word is decoded only after the field is parsed,
so quotes there are not syntax; they only guard against a receiver that
decodes first and re-parses the result (the Gmail failure behind #102).
The encoded path therefore quotes only names holding a character such a
receiver could turn into another address (,;:<>@"\); diacritics and dots
are encoded bare. The literal path keeps the atext test, where the quotes
are real RFC 5322 delimiters.

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695 of 778 relevant lines covered (89.33%)

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