feat: add @TypeOf type hints for compiled templates

- Add TypeHint node type in parser for //- @TypeOf(field): type syntax
- Support scalar types (f32, i32, bool, etc.) and array/struct types
- Use helpers.appendValue() for non-string typed fields
- Filter out loop variable references from Data struct fields
- Preserve @TypeOf comments during comment stripping

Example usage:
  //- @TypeOf(subtotal): f32
  span $#{subtotal}

  //- @TypeOf(items): []{name: []const u8, price: f32}
  each item in items
    h3 #{item.name}

build.zig.zon

@@ -1,6 +1,6 @@
 .{
     .name = .pugz,
-    .version = "0.3.1",
+    .version = "0.3.2",
     .fingerprint = 0x822db0790e17621d, // Changing this has security and trust implications.
     .minimum_zig_version = "0.15.2",
     .dependencies = .{},