- Add includes/some_partial.pug partial in demo views
- Add pages/include-demo.pug page using include directive
- Add /include-demo route in demo server
- Add link to include demo in about page
- Fix test_includes.zig path in build.zig
- Add test_views for include testing
- Lexer now emits a single token for the entire expression (e.g., "btn btn-" + type)
- Runtime evaluateExpression now handles + operator for string concatenation
- Added findConcatOperator to safely find operators outside quotes/brackets
The lexer would hang when encountering operators like + in attribute values
(e.g., class="btn btn-" + type). Added scanAttrValuePart to handle
expression continuation with operators (+, -, *, /).
Also cleaned up debug prints from view_engine.zig and demo/main.zig.
