fix: remove unused validation percentage indicator

The 0% indicator next to the Run button was not providing useful
feedback. Removed from HTML, CSS, and app.js.

src/app.js

@@ -27,7 +27,6 @@ const elements = {
 	redoBtn: document.getElementById("redo-btn"),
 	resetCodeBtn: document.getElementById("reset-code-btn"),
 	hintArea: document.getElementById("hint-area"),
-	validationIndicators: document.querySelector(".validation-indicators-container"),
 	editorContent: document.querySelector(".editor-content"),
 	codeEditor: document.querySelector(".code-editor"),
 
@@ -294,9 +293,6 @@ function loadCurrentLesson() {
 		codeEditor.setValue(engineState.userCode);
 	}
 
-	// Reset validation indicators
-	elements.validationIndicators.innerHTML = "";
-
 	// Update Run button text based on completion status
 	if (engineState.isCompleted) {
 		elements.runBtn.innerHTML = '<img src="./gear.svg" alt="" />Re-run';
@@ -389,7 +385,6 @@ function resetCode() {
 	// Clear hints and success indicators
 	clearHint();
 	resetSuccessIndicators();
-	elements.validationIndicators.innerHTML = "";
 }
 
 function runCode() {
@@ -408,12 +403,6 @@ function runCode() {
 	// Validate code using LessonEngine
 	const validationResult = lessonEngine.validateCode();
 
-	// Update validation indicators
-	if (validationResult.totalCases > 0) {
-		const percent = Math.round((validationResult.validCases / validationResult.totalCases) * 100);
-		elements.validationIndicators.innerHTML = `${percent}%`;
-	}
-
 	if (validationResult.isValid) {
 		// Show success hint
 		showSuccessHint(validationResult.message || "Great job! Your code works correctly.");

src/index.html

@@ -47,7 +47,6 @@
 										<button id="redo-btn" class="btn btn-icon" title="Redo (Ctrl+Shift+Z)">↷</button>
 										<button id="reset-code-btn" class="btn btn-icon" title="Reset to initial code">⟲</button>
 									</div>
-									<div class="validation-indicators-container"></div>
 									<button id="run-btn" class="btn btn-run">
 										<img src="./gear.svg" alt="" />Run
 									</button>

src/main.css

@@ -810,23 +810,6 @@ input:checked + .toggle-slider::before {
 	color: var(--text-color);
 }
 
-/* ================= VALIDATION INDICATORS ================= */
-.validation-indicators-container {
-	display: flex;
-	gap: 4px;
-}
-
-.validation-success-indicator {
-	background: var(--success-color);
-	color: white;
-	width: 18px;
-	height: 18px;
-	border-radius: 50%;
-	display: flex;
-	align-items: center;
-	justify-content: center;
-	font-size: 10px;
-}
 
 /* ================= MODAL ================= */
 .modal-container {