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Follow up to #13978 `ghostty_terminal_paste` no longer takes the clipboard's data up front. The request now carries only the list of available MIME types plus a a callback that writes one representation's bytes into a `GhosttyWriter`. Previously an embedder had to load every representation for every MIME type into memory before pasting. For a clipboard holding a large image or video next to some text that could be hundreds of megabytes that were never used. I also took care to make sure that the data is only read once, to avoid any time-of-check/time-of-use (TOCTOU) issues. There is only one case where data might be fully buffered in memory now: unsafe text data that needs to be checked. This is true for how Ghostty GUI works today too.