fix: improve form submission UX and error handling (v1.0.4)

- Increase Airtable API timeout from 5s to 15s
- Add timing logs for Airtable API calls (success and error)
- Fix email send failures to trigger error state (was silent)
- Add loading spinner and "Sending..." text on submit button
- Add "Failed!" error state with red button and highlighted error message
- Bump version to 1.0.4 for cache busting

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: johannesparty

wp-content/plugins/bd4d/assets/css/main.min.css

@@ -99,7 +99,51 @@ div.form-fields div.signup-input .signup:hover {
 .newsletter-subscribe input[type=submit][disabled=disabled] {
   opacity: 0.5;
 }
+.newsletter-subscribe input[type=submit].is-loading {
+  position: relative;
+  padding-left: 2.5em;
+  cursor: wait;
+}
+.newsletter-subscribe input[type=submit].is-loading::before {
+  content: "";
+  position: absolute;
+  left: 1em;
+  top: 50%;
+  width: 1em;
+  height: 1em;
+  margin-top: -0.5em;
+  border: 2px solid transparent;
+  border-top-color: currentcolor;
+  border-radius: 50%;
+  animation: bd4d-spin 0.8s linear infinite;
+}
+.newsletter-subscribe input[type=submit].is-error {
+  background-color: #dc3545;
+  color: white;
+  border-color: #dc3545;
+}
+.newsletter-subscribe .error-message.is-visible {
+  background-color: rgba(220, 53, 69, 0.15);
+  border: 1px solid #dc3545;
+  border-radius: 4px;
+  padding: 0.75em 1em;
+  margin-top: 1em;
+  animation: bd4d-pulse 0.5s ease-in-out;
+}
 
+@keyframes bd4d-spin {
+  to {
+    transform: rotate(360deg);
+  }
+}
+@keyframes bd4d-pulse {
+  0%, 100% {
+    opacity: 1;
+  }
+  50% {
+    opacity: 0.6;
+  }
+}
 /* override divi styles */
 html body.single .et_pb_post {
   margin-bottom: 0;

wp-content/plugins/bd4d/assets/css/main.src.css

@@ -110,7 +110,54 @@ div.form-fields {
 		&[disabled="disabled"] {
 			opacity: 0.5;
 		}
+
+		// Loading state
+		&.is-loading {
+			position: relative;
+			padding-left: 2.5em;
+			cursor: wait;
+
+			&::before {
+				content: '';
+				position: absolute;
+				left: 1em;
+				top: 50%;
+				width: 1em;
+				height: 1em;
+				margin-top: -0.5em;
+				border: 2px solid transparent;
+				border-top-color: currentcolor;
+				border-radius: 50%;
+				animation: bd4d-spin 0.8s linear infinite;
+			}
+		}
+
+		// Error state
+		&.is-error {
+			background-color: #dc3545;
+			color: white;
+			border-color: #dc3545;
+		}
 	}
+
+	// Error message highlight
+	.error-message.is-visible {
+		background-color: rgb(220, 53, 69, 15%);
+		border: 1px solid #dc3545;
+		border-radius: 4px;
+		padding: 0.75em 1em;
+		margin-top: 1em;
+		animation: bd4d-pulse 0.5s ease-in-out;
+	}
+}
+
+@keyframes bd4d-spin {
+	to { transform: rotate(360deg); }
+}
+
+@keyframes bd4d-pulse {
+	0%, 100% { opacity: 1; }
+	50% { opacity: 0.6; }
 }
 
 /* override divi styles */