fix: resolve feedback validation issues from GitHub issue #16

- Fixed backend validation to properly handle empty strings in validateGuestRequirements
- Added Boolean conversion for SQLite boolean values in feedback settings API response
- Created FeedbackIdentityModal component for collecting name/email when required
- Updated PhotoLikes, PhotoRating, and PhotoFavorites components to show modal when requireNameEmail is true
- Fixed issue where require_name_email field was not reaching frontend due to missing boolean conversion

This ensures that when 'Require Name & Email' is enabled, guests are prompted with a modal to provide their information before submitting feedback, preventing 400 Bad Request errors.

🤖 Generated with Claude Code

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

backend/src/utils/feedbackValidation.js

@@ -227,11 +227,17 @@ async function validateGuestRequirements(settings, guestData) {
   
   const errors = [];
   
-  if (!guestData.guest_name || guestData.guest_name.trim().length === 0) {
+  // Check for name - handle both undefined and empty strings
+  const name = guestData.guest_name;
+  if (!name || (typeof name === 'string' && name.trim().length === 0)) {
     errors.push('Name is required');
   }
   
-  if (!guestData.guest_email || !validator.isEmail(guestData.guest_email)) {
+  // Check for email - handle both undefined and empty strings
+  const email = guestData.guest_email;
+  if (!email || (typeof email === 'string' && email.trim().length === 0)) {
+    errors.push('Valid email is required');
+  } else if (email && !validator.isEmail(email.trim())) {
     errors.push('Valid email is required');
   }