copilot-swe-agent[bot] 74c3bbe06d Implement software rendering for Unicode 16 legacy computing symbols ...

Add rendering for codepoints U+1FBCE-U+1FBEF, U+1CC1B-U+1CC3F,
and U+1CE16-U+1CE19 in decorations.c with registration in fonts.c
and test coverage in kitty_tests/fonts.py.

Characters implemented:
- U+1FBCE-1FBCF: Left two-thirds and one-third blocks
- U+1FBD0-1FBDF: 16 diagonal box drawing characters
- U+1FBE0-1FBE3: Justified half white circles (outlines)
- U+1FBE4-1FBE5: Upper/lower centre quarter blocks
- U+1FBE8-1FBEB: Justified half black circles (filled)
- U+1FBEC-1FBEF: Justified quarter black circles (filled)
- U+1CC1B-1CC1E: Box drawing variants with offset junctions
- U+1CC1F-1CC20: Double diagonal lines
- U+1CC30-1CC3F: Twelfth and quarter circle arcs
- U+1CE16-1CE19: Box drawings light vertical T-junctions

Fixes #9851

2026-04-11 14:17:21 +05:30

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