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

docs/static/style.css

@@ -150,64 +150,109 @@ pre code {
   padding: 0;
 }
 
-/* Syntax highlighting (tree-sitter classes) */
+/* Syntax highlighting (tree-sitter classes)
+ * Dracula-inspired color scheme with full coverage
+ * All colors chosen to work well on dark backgrounds
+ */
+
+/* Keywords: control flow, declarations - Pink */
 .hl-keyword {
   color: #ff79c6;
 }
 
-.hl-string {
+/* Strings and literals - Yellow */
+.hl-string,
+.hl-string-special {
   color: #f1fa8c;
 }
 
-.hl-function {
+.hl-string-escape {
+  color: #ffb86c;
+}
+
+.hl-string-special-path,
+.hl-string-special-uri {
+  color: #8be9fd;
+  text-decoration: underline;
+}
+
+/* Functions and methods - Green */
+.hl-function,
+.hl-function-builtin {
   color: #50fa7b;
 }
 
+/* Comments - Muted blue-gray */
 .hl-comment {
   color: #6272a4;
   font-style: italic;
 }
 
-.hl-number {
+/* Numbers and constants - Purple */
+.hl-number,
+.hl-constant,
+.hl-constant-builtin {
   color: #bd93f9;
 }
 
+/* Operators - Pink (same as keywords for visual consistency) */
 .hl-operator {
   color: #ff79c6;
 }
 
-.hl-punctuation {
+/* Punctuation - Subtle muted */
+.hl-punctuation,
+.hl-punctuation-bracket,
+.hl-punctuation-delimiter {
   color: var(--fg-muted);
 }
 
-.hl-punctuation-bracket {
-  color: var(--fg-muted);
+.hl-punctuation-special {
+  color: #ff79c6;
 }
 
+/* Types - Cyan */
+.hl-type,
+.hl-type-builtin {
+  color: #8be9fd;
+}
+
+/* Variables - Light foreground */
 .hl-variable {
   color: var(--fg);
 }
 
-.hl-type {
+.hl-variable-builtin {
+  color: #ffb86c;
+}
+
+.hl-variable-parameter {
+  color: #ffb86c;
+  font-style: italic;
+}
+
+/* Properties and attributes - Cyan */
+.hl-property,
+.hl-attribute {
   color: #8be9fd;
 }
 
-.hl-constant {
-  color: #bd93f9;
-}
-
-.hl-attribute {
+/* Constructors - Green */
+.hl-constructor {
   color: #50fa7b;
 }
 
-.hl-property {
-  color: #66d9ef;
-}
-
+/* HTML/XML tags - Pink */
 .hl-tag {
   color: #ff79c6;
 }
 
+/* Embedded/escape content - Orange */
+.hl-embedded,
+.hl-escape {
+  color: #ffb86c;
+}
+
 /* Markdown-specific text highlighting */
 .hl-text-title {
   color: #ff79c6;
@@ -227,10 +272,6 @@ pre code {
   color: #bd93f9;
 }
 
-.hl-string-escape {
-  color: #ffb86c;
-}
-
 /* Section navigation */
 .section-nav {
   display: flex;