feat: add loading on register button

src/routes/register/index.svelte

@@ -19,6 +19,9 @@
 		emailEl.focus();
 	});
 	async function handleSubmit() {
+		// Prevent double submission
+		if (loading) return;
+
 		if (password !== passwordCheck) {
 			return errorNotification('Passwords do not match.');
 		}
@@ -88,8 +91,13 @@
 				/>
 
 				<div class="flex space-x-2 h-8 items-center justify-center pt-8">
-					<button type="submit" class="hover:bg-coollabs-100 text-white bg-coollabs"
+					<button
-						>Register</button
+						type="submit"
+						class="hover:bg-coollabs-100 text-white"
+						disabled={loading}
+						class:bg-transparent={loading}
+						class:text-stone-600={loading}
+						class:bg-coollabs={!loading}>{loading ? 'Registering...' : 'Register'}</button
 					>
 				</div>
 			</form>