fix: improve UI elements in recipe editor

- Center isBaseRecipe toggle by changing display to inline-flex
- Fix note field editing by adding textarea with bindable value
- Clear instruction step input after submission instead of restoring placeholder
- Style note textarea with transparent background and lighter placeholder text

The instruction field now properly clears on submission, while ingredient fields retain their previous values.

src/lib/components/CreateStepList.svelte

@@ -247,7 +247,8 @@ export function add_new_step(){
 		instructions[list_index].steps.push(new_step.step)
 	}
 	const el = document.querySelector("#step")
-	el.innerHTML = step_placeholder
+	el.innerHTML = ""
+	new_step.step = ""
 	instructions = instructions //tells svelte to update dom
 }