🎨 Palette: Add loading states to auth forms

.Jules/palette.md

@@ -0,0 +1,3 @@
+## 2026-06-19 - Added loading states to auth forms
+**Learning:** Missing loading states for async operations like login/register can lead to user confusion and potentially multiple form submissions.
+**Action:** Always add visual feedback by disabling the submit button and updating its text to indicate a loading state during async API calls, and reliably restore state using a finally block.

web-demo/js/app.js

@@ -144,6 +144,14 @@ class ClimaAI {
         e.preventDefault();
         const email = document.getElementById('loginEmail').value;
         const password = document.getElementById('loginPassword').value;
+        const submitBtn = e.submitter;
+        let originalContent = '';
+
+        if (submitBtn) {
+            originalContent = submitBtn.innerHTML;
+            submitBtn.disabled = true;
+            submitBtn.innerHTML = 'Logging in...';
+        }
 
         try {
             this.showToast('Logging in...', 'info');
@@ -155,6 +163,11 @@ class ClimaAI {
             this.checkSubscription();
         } catch (error) {
             this.showToast(error.message || 'Login failed', 'error');
+        } finally {
+            if (submitBtn) {
+                submitBtn.disabled = false;
+                submitBtn.innerHTML = originalContent;
+            }
         }
     }
 
@@ -163,6 +176,14 @@ class ClimaAI {
         const name = document.getElementById('registerName').value;
         const email = document.getElementById('registerEmail').value;
         const password = document.getElementById('registerPassword').value;
+        const submitBtn = e.submitter;
+        let originalContent = '';
+
+        if (submitBtn) {
+            originalContent = submitBtn.innerHTML;
+            submitBtn.disabled = true;
+            submitBtn.innerHTML = 'Creating account...';
+        }
 
         try {
             this.showToast('Creating account...', 'info');
@@ -174,6 +195,11 @@ class ClimaAI {
             this.checkSubscription();
         } catch (error) {
             this.showToast(error.message || 'Registration failed', 'error');
+        } finally {
+            if (submitBtn) {
+                submitBtn.disabled = false;
+                submitBtn.innerHTML = originalContent;
+            }
         }
     }