fix: more reliable copy/paste with focus polling, clipboard save/restore, toast feedback

public/app.js

@@ -446,6 +446,33 @@ document.addEventListener('keydown', (e) => {
   if (e.key === 'ArrowLeft' && currentPage > 0) renderPage(currentPage - 1);
 });
 
+/* ─── Clipboard result toast ────────────────────────────────────────────── */
+const toastEl = document.getElementById('toast');
+let toastTimer = null;
+
+function showToast(msg, duration) {
+  duration = duration || 2000;
+  if (!toastEl) return;
+  toastEl.textContent = msg;
+  toastEl.style.display = 'block';
+  if (toastTimer) clearTimeout(toastTimer);
+  toastTimer = setTimeout(() => {
+    toastEl.style.display = 'none';
+  }, duration);
+}
+
+if (IS_ELECTRON) {
+  window.electronAPI.onClipboardResult((data) => {
+    if (data.action === 'copy' && data.text) {
+      const short = data.text.length > 60 ? data.text.substring(0, 57) + '…' : data.text;
+      showToast(`Copied: "${short}"`, 2500);
+    } else if (data.action === 'cut' && data.text) {
+      const short = data.text.length > 60 ? data.text.substring(0, 57) + '…' : data.text;
+      showToast(`Cut: "${short}"`, 2500);
+    }
+  });
+}
+
 /* ─── Document-level event logger (for troubleshooting touch) ──────────── */
 function docLog(e) {
   window.debugLog(`📄 ${e.type}`, `target:${e.target?.tagName} pt:${e.pointerType || '-'} btn:${e.which || e.button || 0}`);

public/index.html

@@ -31,6 +31,7 @@
     <div id="page-indicator"></div>
   </div>
 
+  <div id="toast" style="display:none; position:fixed; bottom:60px; left:50%; transform:translateX(-50%); background:rgba(0,0,0,0.8); color:#fff; padding:10px 20px; border-radius:8px; font:14px sans-serif; max-width:80%; text-align:center; z-index:999; pointer-events:none;"></div>
   <div id="debug-overlay" style="display:none; position:fixed; bottom:0; left:0; right:0; background:rgba(0,0,0,0.85); color:#0f0; font:11px monospace; padding:6px; max-height:80px; overflow-y:auto; z-index:999; pointer-events:none;"></div>
   <script src="app.js"></script>
 </body>