Fix SVG element casing to preserve camelCase names

SVG elements like feDropShadow were incorrectly converted to lowercase,
breaking their functionality. Now properly preserves casing for known
SVG elements while normalizing regular HTML elements.

Fixes svg filter rendering issue where filters would not display.

Author: Madoshakalaka

packages/yew-macro/src/html_tree/html_element.rs

@@ -370,7 +370,14 @@ impl ToTokens for HtmlElement {
         tokens.extend(match &name {
             TagName::Lit(dashedname) => {
                 let name_span = dashedname.span();
-                let name = dashedname.to_ascii_lowercase_string();
+                let original_name = dashedname.to_string();
+                let name = if is_normalised_element_name(&original_name) {
+                    // Preserve case for known SVG/special elements
+                    original_name
+                } else {
+                    // Convert to lowercase for regular HTML elements
+                    dashedname.to_ascii_lowercase_string()
+                };
                 if !is_normalised_element_name(&dashedname.to_string()) {
                     emit_warning!(
                         name_span.clone(),