Add the metadata file path for easy copy+paste

templates/gallery.html

@@ -44,6 +44,19 @@
     </button>
     
     <div class="metadata-content" id="metadataContent" style="display: none;">
+      <div class="metadata-header">
+        <div class="metadata-file-info">
+          <span class="file-path-label">📁 Metadata file:</span>
+          <code class="file-path" id="metadata-file-path">{{ metadata_file_path }}</code>
+          <button class="copy-path-btn" onclick="copyMetadataPath()" title="Copy path to clipboard">
+            📋 Copy
+          </button>
+          <span class="tip-icon" title="Tip: Create this file in the source directory to add folder-level metadata that will be inherited by all plots in this folder and its subdirectories. Supports both YAML (.yaml/.yml) and JSON (.json) formats.">
+            💡
+          </span>
+        </div>
+      </div>
+      
       <div class="metadata-grid">
         {% for key, value in folder_metadata.items() %}
           <div class="metadata-item">