add phase for colorscheme migration

Paper Tonic colorscheme and custom highlights

- Port Paper Tonic colorscheme as a local plugin.
- Add custom TreeSitter captures for CSS and HTML.
- Verify and extend highlights for plugins and captures.
- Retire legacy highlights and validate performance.

after/queries/html/highlights.scm

@@ -0,0 +1,17 @@
+(start_tag
+	(attribute
+		(attribute_name) @ClassNameAttribute (#eq? @ClassNameAttribute "class")
+		(quoted_attribute_value
+			(attribute_value) @CssClassName )))
+
+(start_tag
+	(attribute
+		(attribute_name) @IdAttribute (#eq? @IdAttribute "id")
+		(quoted_attribute_value
+			(attribute_value) @CssIdentifier )))
+
+(start_tag
+	(attribute
+		(attribute_name) @DataAttribute (#match? @DataAttribute "^data-")
+		(quoted_attribute_value
+			(attribute_value) @DataAttributeValue )))