A fork of helix with a bespoke collection patches.

theme(wolf-alabaster): Add missing UI scopes (#15159) master

Addresses feedback from @Rudxain on #15102. Added scopes: - ui.virtual.inlay-hint: dimmed blue (matches type color but muted) - ui.cursorline, ui.cursorcolumn: subtle line highlighting - ui.virtual.ruler: ruler column background - ui.gutter: gutter background - diagnostic.deprecated: crossed-out styling - tag.error: error styling for malformed markup