Fix state persistence when popup is closed

- Add 'dismissed' status to prevent dismissed PDFs from reappearing
- Persist PDFs discovered from current tab and recent downloads via background
- Add dismissPDF function that marks PDFs as dismissed instead of removing
- Dismissed PDFs are kept for 7 days for duplicate detection, then cleaned up
- Completed items (sent/canceled) can still be fully removed
- Add addPDF message handler to service worker for popup-discovered PDFs

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/popup/popup.ts

@@ -153,22 +153,20 @@ async function loadPDFQueue() {
   console.log('[Popup] Loading PDF queue...');
 
   // Get all PDFs from background script (including completed ones)
-  const response = await chrome.runtime.sendMessage({ action: 'getAllPDFs' });
+  let response = await chrome.runtime.sendMessage({ action: 'getAllPDFs' });
   pdfQueue = response?.entries || [];
   console.log('[Popup] Got', pdfQueue.length, 'entries from background');
 
-  // Also check current tab for PDF
+  // Check current tab for PDF and add to persistent queue via background
   const currentTabPDF = await checkCurrentTabForPDF();
   if (currentTabPDF) {
-    // Check if already in queue
-    const exists = pdfQueue.some(p => p.url === currentTabPDF.url);
-    if (!exists) {
-      console.log('[Popup] Adding current tab PDF to queue:', currentTabPDF.filename);
-      const entry: PDFQueueEntry = {
-        ...currentTabPDF,
-        status: 'pending'
-      };
-      pdfQueue.unshift(entry);
+    // Add via background service (will check for duplicates/dismissed)
+    const addResult = await chrome.runtime.sendMessage({
+      action: 'addPDF',
+      pdf: currentTabPDF
+    });
+    if (addResult?.entry) {
+      console.log('[Popup] Added current tab PDF to persistent queue:', currentTabPDF.filename);
     }
   }
 
@@ -177,16 +175,19 @@ async function loadPDFQueue() {
     console.log('[Popup] Queue empty, checking recent downloads...');
     const recentPDFs = await checkRecentDownloads();
     for (const pdf of recentPDFs) {
-      const exists = pdfQueue.some(p => p.url === pdf.url);
-      if (!exists) {
-        pdfQueue.push({
-          ...pdf,
-          status: 'pending'
-        });
-      }
+      // Add each PDF via background service (will check for duplicates/dismissed)
+      await chrome.runtime.sendMessage({
+        action: 'addPDF',
+        pdf
+      });
     }
   }
 
+  // Reload queue after potential additions
+  response = await chrome.runtime.sendMessage({ action: 'getAllPDFs' });
+  pdfQueue = response?.entries || [];
+  console.log('[Popup] Final queue count:', pdfQueue.length);
+
   // Render the list
   renderPDFList();
 }
@@ -757,7 +758,17 @@ async function handleRefreshStatus(id: string) {
  * Handle dismiss PDF
  */
 async function handleDismissPDF(id: string) {
-  await chrome.runtime.sendMessage({ action: 'removePDF', id });
+  const pdf = pdfQueue.find(p => p.id === id);
+  if (!pdf) return;
+
+  // For pending/failed/in_basket items, mark as dismissed to prevent re-showing
+  // For completed items (sent/canceled), actually remove from storage
+  if (pdf.status === 'sent' || pdf.status === 'canceled') {
+    await chrome.runtime.sendMessage({ action: 'removePDF', id });
+  } else {
+    await chrome.runtime.sendMessage({ action: 'dismissPDF', id });
+  }
+
   pdfQueue = pdfQueue.filter(p => p.id !== id);
   renderPDFList();
 }