feat(ui): aggiunge anteprima desktop dei file non smistati

renderer/index.html

@@ -161,6 +161,65 @@
         color: var(--muted);
       }
 
+      .preview-overlay {
+        position: fixed;
+        inset: 0;
+        background: rgba(15, 23, 42, 0.55);
+        display: none;
+        align-items: center;
+        justify-content: center;
+        padding: 16px;
+        z-index: 20;
+      }
+
+      .preview-overlay.visible {
+        display: flex;
+      }
+
+      .preview-card {
+        width: min(900px, 100%);
+        max-height: 85vh;
+        background: #ffffff;
+        border: 1px solid var(--border);
+        border-radius: 12px;
+        padding: 14px;
+        display: flex;
+        flex-direction: column;
+        gap: 10px;
+      }
+
+      .preview-header {
+        display: flex;
+        align-items: center;
+        justify-content: space-between;
+        gap: 10px;
+      }
+
+      .preview-header h2 {
+        margin: 0;
+        font-size: 18px;
+      }
+
+      .preview-meta {
+        font-size: 12px;
+        color: var(--muted);
+        word-break: break-all;
+      }
+
+      .preview-list {
+        margin: 0;
+        background: #0f172a;
+        color: #e2e8f0;
+        border: 1px solid var(--border);
+        border-radius: 10px;
+        padding: 12px;
+        overflow: auto;
+        min-height: 220px;
+        max-height: 58vh;
+        font-size: 13px;
+        white-space: pre-wrap;
+      }
+
       @media (max-width: 760px) {
         .rule-row {
           grid-template-columns: 1fr;
@@ -200,11 +259,25 @@
           <button id="browseDestinationBtn" class="browse">Sfoglia</button>
           <button id="saveDestinationBtn">Salva</button>
         </div>
+        <div class="rule-row single-row">
+          <button id="openUnroutedBtn" class="browse">Anteprima non smistati</button>
+        </div>
         <div class="rule-status" id="destinationStatus"></div>
       </section>
       <pre id="output">Pronto.</pre>
     </main>
 
+    <section class="preview-overlay" id="unroutedPreviewOverlay">
+      <article class="preview-card">
+        <div class="preview-header">
+          <h2>Anteprima __NON_SMISTATI</h2>
+          <button id="closeUnroutedPreviewBtn" class="secondary">Chiudi</button>
+        </div>
+        <div class="preview-meta" id="unroutedPreviewMeta"></div>
+        <pre class="preview-list" id="unroutedPreviewList">Nessun dato.</pre>
+      </article>
+    </section>
+
     <script src="./renderer.js"></script>
   </body>
 </html>