feat(ui): anteprima duplicati/non smistati con pulizia cartella confermata

renderer/index.html

@@ -133,6 +133,11 @@
         margin-top: 10px;
       }
 
+      .rule-row.preview-actions {
+        grid-template-columns: auto auto;
+        justify-content: start;
+      }
+
       .rule-label {
         font-size: 13px;
         color: var(--muted);
@@ -195,11 +200,21 @@
         gap: 10px;
       }
 
+      .preview-header-actions {
+        display: flex;
+        gap: 8px;
+        align-items: center;
+      }
+
       .preview-header h2 {
         margin: 0;
         font-size: 18px;
       }
 
+      .danger {
+        background: #b91c1c;
+      }
+
       .preview-meta {
         font-size: 12px;
         color: var(--muted);
@@ -259,22 +274,26 @@
           <button id="browseDestinationBtn" class="browse">Sfoglia</button>
           <button id="saveDestinationBtn">Salva</button>
         </div>
-        <div class="rule-row single-row">
+        <div class="rule-row single-row preview-actions">
           <button id="openUnroutedBtn" class="browse">Anteprima non smistati</button>
+          <button id="openDuplicatesBtn" class="browse">Anteprima duplicati</button>
         </div>
         <div class="rule-status" id="destinationStatus"></div>
       </section>
       <pre id="output">Pronto.</pre>
     </main>
 
-    <section class="preview-overlay" id="unroutedPreviewOverlay">
+    <section class="preview-overlay" id="previewOverlay">
       <article class="preview-card">
         <div class="preview-header">
-          <h2>Anteprima __NON_SMISTATI</h2>
-          <button id="closeUnroutedPreviewBtn" class="secondary">Chiudi</button>
+          <h2 id="previewTitle">Anteprima</h2>
+          <div class="preview-header-actions">
+            <button id="clearPreviewBtn" class="danger">Pulisci cartella</button>
+            <button id="closePreviewBtn" class="secondary">Chiudi</button>
+          </div>
         </div>
-        <div class="preview-meta" id="unroutedPreviewMeta"></div>
-        <pre class="preview-list" id="unroutedPreviewList">Nessun dato.</pre>
+        <div class="preview-meta" id="previewMeta"></div>
+        <pre class="preview-list" id="previewList">Nessun dato.</pre>
       </article>
     </section>