WIP: enhance validation feedback in code editor, add support for multiple validation indicators and new validation types

src/index.html

@@ -51,6 +51,7 @@
 								<div class="code-editor">
 									<div class="editor-header">
 										<span>CSS Editor</span>
+										<div class="validation-indicators-container"></div>
 										<button id="run-btn" class="btn btn-secondary"><img src="./gear.svg" />Run</button>
 									</div>
 									<div class="editor-content">