* feat(tui): add OSC 8 hyperlinks to make wrapped URLs clickable
Long URLs that exceed terminal width get broken across lines by pi-tui's
word wrapping, making them unclickable. Post-process rendered markdown
output to add OSC 8 terminal hyperlink sequences around URL fragments,
so each line fragment links to the full URL. Gracefully degrades on
terminals without OSC 8 support.
* tui: harden OSC8 URL extraction and prefix resolution
* tui: add changelog entry for OSC 8 markdown hyperlinks
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Co-authored-by: Vincent Koc <vincentkoc@ieee.org>
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