12a99f39

By: Tom Sydney Kerckhove <syd@cs-syd.eu>

Fix OSC 8 close token resetting chunkStyleHyperlink to Nothing

Previously the close token (empty URL) set chunkStyleHyperlink = Just "".
Now it resets to Nothing, matching the semantics: text after a hyperlink
close is not hyperlinked.

renderChunkBuilder already unconditionally emits the OSC 8 close after
any hyperlinked chunk, so the roundtrip holds cleanly.

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