Bugfix "standalone emoji" by wcwidth grapheme integration

[jquast]

Type of changes

• Bug fix
• New feature
• Documentation / docstrings
• Tests
• Other

AI?

• AI was used to generate this PR

Checklist

• I've run the latest black with default args on new code.
• I've updated CHANGELOG.md and CONTRIBUTORS.md where appropriate (see note about typos above).
• I've added tests for new code.
• I accept that @willmcgugan may be pedantic in the code review.

Description

Add wcwidth>=0.5.3 as a runtime dependency, and replace Rich's custom code generation and grapheme splitting / width logic measurement with wcwidth.width(), iter_graphemes(), and clip().

Most importantly this fixes some eastern languages with complex combining rules (Virama, Hangul), "standalone" emojis skin tones, standalone "regional indicators", skin tones), but also eliminates ongoing maintenance of custom Unicode logic.

Before

Konsole:

Ghostty:

After

Konsole:

Ghostty:

[jquast]

Regarding multiple unicode versions, I do think support for them should be removed.

Six years ago I wrote about the need for and implemented unicode_version parameter to wcwidth, but initial and ongoing ucs-detect results lead me to suggest that unicode support varies widely[1][2], not just by version, but by feature -- ZWJ/RI/VS16/Graphemes/Languages. Beginning wcwidth 0.5, only single-version tables are published derived from the latest Unicode data release files (17.0)

Although it is possible to introspect each terminal, as the ucs-detect tool does, to test against and curate "prediction tables" to absolutely match all terminals, supporting or not, eg. Supports v12 zero tables, v17 wide, ZWJ but with these exceptions, no VS-16 support, limited grapheme support, the overhead is considered too great to support by code.

The python wcwidth library specifications very closely matches the kitty specification and is maintained with the help of community to match development of actively maintained terminal emulators. The nightly of ghostty matches this specification very closely and has a perfect score with ucs-detect tool, as pictured in the "After" screenshot, above without error.