Add component parameter support and fix JS runtime

- Emit function parameters in component signature
- JS runtime passes props as positional arguments
- Remove incorrect return value handling (components call js_set_root internally)
- Enables: def Tabs(orientation=0)
- All tests passing (30/30)

examples/runtime/ritz-runtime.js

@@ -277,12 +277,8 @@ class RitzLoader {
             }
 
             // Pass props as positional arguments
-            // Components now RETURN the root element ID instead of calling js_set_root
             const propValues = Object.values(props);
-            const rootElementId = renderFn(...propValues);
-
-            // Mount the returned element to the DOM
-            runtime.js_set_root(rootElementId);
+            renderFn(...propValues);
 
             // Update signals
             runtime.updateSignals();