fix: update parameters when default values change in code

- Include default_value in parameter hash to detect when defaults change
- Use parameter.default_value as fallback in FormElement when no form state exists
- Ensures form resets and shows new defaults when code changes parameter defaults

Co-authored-by: Kira-Pilot <[email protected]>

Author: blink-so[bot]

src/client/Preview.tsx

@@ -61,7 +61,7 @@ import { mockUsers } from "@/owner";
 const createParametersHash = (parameters: ParameterWithSource[], owner: WorkspaceOwner, code: string): string => {
 	// Create a deterministic string from parameters structure, owner, and code
 	const parameterSignature = parameters
-		.map(p => `${p.name}:${p.type}:${p.order}:${p.required}`)
+		.map(p => `${p.name}:${p.type}:${p.order}:${p.required}:${p.default_value}`)
 		.sort()
 		.join('|');
 	const ownerSignature = `${owner.id}:${owner.name}:${JSON.stringify(owner.rbac_roles)}`;
@@ -569,6 +569,7 @@ const FormElement: FC<FormElementProps> = ({ parameter }) => {
 	const value = useMemo(
 		() =>
 			$form[parameter.name] ??
+			parameter.default_value ??
 			undefined,
 		[$form, parameter],
 	);