WebP Express CloudHost.es Fix v0.25.9-cloudhost

✅ Fixed bulk conversion getting stuck on missing files
✅ Added robust error handling and timeout protection
✅ Improved JavaScript response parsing
✅ Added file existence validation
✅ Fixed missing PHP class imports
✅ Added comprehensive try-catch error recovery

🔧 Key fixes:
- File existence checks before conversion attempts
- 30-second timeout protection per file
- Graceful handling of 500 errors and JSON parsing issues
- Automatic continuation to next file on failures
- Cache busting for JavaScript updates

🎯 Result: Bulk conversion now completes successfully even with missing files

🚀 Generated with Claude Code (https://claude.ai/code)

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

lib/options/js/purge-cache.js

@@ -0,0 +1,50 @@
+
+function openDeleteConvertedFilesPopup() {
+    var html = '';
+    html += '<p>To delete all converted files, click this button:<br>';
+    html += '<button onclick="purgeCache(false)" class="button button-secondary" type="button">Delete all converted files</button>';
+    html += '</p>';
+    html += '<p>Or perhaps, you only want to delete the converted <i>PNGs</i>? Then this button is for you:<br>';
+    html += '<button onclick="purgeCache(true)" class="button button-secondary" type="button">Delete converted PNGs</button>';
+    html += '</p>';
+
+    document.getElementById('purgecachecontent').innerHTML = html;
+    tb_show('Purge cache', '#TB_inline?inlineId=purgecachepopup');
+//    purgeCache();
+}
+
+function purgeCache(onlyPng) {
+    var data = {
+        'action': 'webpexpress_purge_cache',
+        'nonce' : window.webpExpress['ajax-nonces']['purge-cache'],
+        'only-png': onlyPng
+    };
+    jQuery.post(ajaxurl, data, function(response) {
+        if ((typeof response == 'object') && (response['success'] == false)) {
+            if (response['data'] && ((typeof response['data']) == 'string')) {
+                alert(response['data']);
+            } else {
+                alert('Something failed');
+            }
+            return;
+        }
+
+        var result = JSON.parse(response);
+        //console.log(result);
+
+        if (result['fail-count'] == 0) {
+            if (result['delete-count'] == 0) {
+                alert('No webp files were found, so none was deleted.');
+            } else {
+                alert('Successfully deleted ' + result['delete-count'] + ' webp files');
+            }
+        } else {
+            if (result['delete-count'] == 0) {
+                alert('Failed deleting ' + result['fail-count'] + ' webp files. None was deleted, in fact.');
+            } else {
+                alert('Deleted ' + result['delete-count'] + ' webp files. However, failed deleting ' + result['fail-count'] + ' webp files.');
+            }
+        }
+
+    });
+}