Implement document proxy concept with archive/live views

- Add content hash (MD5) for document deduplication
- Separate local state (archived) from server state (binectStatus)
- Add archive toggle button to switch between live/archived views
- Add archive/restore/delete actions for documents
- Refactor pdf-queue.ts with DocumentProxy interface
- Add hash.ts utility for content hashing

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

src/background/service-worker.ts

@@ -9,8 +9,12 @@ import {
   addPDF,
   getActionableCount,
   getAllPDFs,
+  getLiveProxies,
+  getArchivedProxies,
   getPendingPDFs,
   updatePDFStatus,
+  archiveProxy,
+  restoreProxy,
   dismissPDF,
   removePDF,
   cleanupOldEntries,
@@ -130,6 +134,24 @@ chrome.runtime.onMessage.addListener((request, sender, sendResponse) => {
     return true;
   }
 
+  // Get live proxy documents (not archived)
+  if (request.action === 'getLiveProxies') {
+    getLiveProxies().then(entries => {
+      console.log('[Service Worker] Returning live proxies:', entries.length, 'entries');
+      sendResponse({ entries });
+    });
+    return true;
+  }
+
+  // Get archived proxy documents
+  if (request.action === 'getArchivedProxies') {
+    getArchivedProxies().then(entries => {
+      console.log('[Service Worker] Returning archived proxies:', entries.length, 'entries');
+      sendResponse({ entries });
+    });
+    return true;
+  }
+
   // Add a PDF to the queue (from popup discovery)
   if (request.action === 'addPDF') {
     addPDF(request.pdf).then(entry => {
@@ -171,6 +193,26 @@ chrome.runtime.onMessage.addListener((request, sender, sendResponse) => {
     return true;
   }
 
+  // Archive a proxy document (move to archive view)
+  if (request.action === 'archiveProxy') {
+    archiveProxy(request.id).then(() => {
+      return updateBadge();
+    }).then(() => {
+      sendResponse({ success: true });
+    });
+    return true;
+  }
+
+  // Restore a proxy document (move back to live view)
+  if (request.action === 'restoreProxy') {
+    restoreProxy(request.id).then(() => {
+      return updateBadge();
+    }).then(() => {
+      sendResponse({ success: true });
+    });
+    return true;
+  }
+
   if (request.action === 'removePDF') {
     removePDF(request.id).then(() => {
       return updateBadge();