ascii-boxes / boxes / 31165164403

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Fix box misalignment for emoji with variation selectors

Characters like ⚠️ are actually two codepoints: the base symbol (⚠ U+26A0) plus an invisible "variation selector" (U+FE0F) that tells the terminal to render it as a wide emoji.
Boxes counted the base symbol as 1 column wide and ignored the selector, but terminals display it as 2 columns. This made the right border shift 1 position too far for each affected character.
Characters like 💡 that are inherently wide were handled correctly — only the ones that get promoted to wide by the variation selector were miscounted.
Common affected characters: ⚠️, ℹ️, ✅, ❤️, 1⃣  and other keycap emoji.

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