- resolveUploadInput: remove length < 1024 guard on file path detection.
Prefix patterns (isAbsolute / ~ / ./ / ../) already correctly distinguish
file paths from base64 strings at any length. The old guard caused file
paths ≥1024 chars to fall through to the base64 branch incorrectly.
- parseColorMarkup: add comment clarifying that mismatched closing tags
(e.g. [red]text[/green]) are intentional — opening tag style is applied,
closing tag is consumed regardless of name.
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