style(highlight): complete Dracula color coverage for all syntax tokens
Expand syntax highlighting CSS from 15 to 31 highlight classes, ensuring
all tree-sitter captures have assigned colors. Organized into logical
sections with comments.
Coverage added:
- type-builtin, function-builtin, constant-builtin (variants)
- variable-builtin, variable-parameter (orange, italic)
- constructor, embedded, escape
- string-special, string-special-path, string-special-uri
- punctuation-special
Color palette (Dracula-inspired):
- Pink (#ff79c6): keywords, operators, tags, punctuation-special
- Yellow (#f1fa8c): strings
- Green (#50fa7b): functions, constructors
- Cyan (#8be9fd): types, properties, attributes
- Purple (#bd93f9): numbers, constants
- Orange (#ffb86c): builtins, parameters, escapes
- Muted (#6272a4): comments
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