fix: force text presentation for ▶ connectors

Append ︎ (VARIATION SELECTOR-15) to the ▶ (U+25B6) connectors so terminals render them as text, not emoji.

Saw it at https://x.com/_onmax/status/2061089478974787854/photo/1. Not sure which terminals/conditions trigger the emoji promotion, but pinning text presentation is safe regardless.