Enhanced Terminal Text Rendering for Emoji and Unicode

What: Significantly improved display width calculation for emoji, flag characters, and complex Unicode scripts Details:

• Adds fast-path optimization for ASCII strings (performance improvement)
• Correctly handles Regional Indicator flag emojis (🇺🇸, 🇬🇧)
• Proper width calculation for keycap sequences (1️⃣, 2️⃣)
• Better support for zero-width characters in Indic, Arabic, and Hebrew scripts
• Prevents terminal misalignment issues with emoji-containing content
• Evidence: N94() at line 61894, q94() at line 61905, _g0() at line 61921