feat(books): rebuild duplicate books as a ledger

Sort groups by reclaimable space, pre-pick a keeper with a rule that states
its reasoning, and expand any row into a field-by-field comparison that shows
only what differs. Persist "not duplicates" so a judgement survives a rescan,
and review every copy before deleting. Reading progress no longer renders 0%.

server/test/e2e/authorization-matrix/route-inventory/manifest.json

@@ -1,5 +1,5 @@
 {
-  "totalRoutes": 595,
+  "totalRoutes": 598,
   "byPermission": {
     "(none)": 259,
     "Permission.ManageMetadataConfig": 34,
@@ -17,7 +17,7 @@
     "Permission.OpdsAccess": 4,
     "Permission.ViewAuditLog": 1,
     "Permission.ViewUserActivity": 6,
-    "Permission.LibraryDeleteBooks": 11,
+    "Permission.LibraryDeleteBooks": 14,
     "Permission.LibraryDownload": 4,
     "Permission.LibraryUpload": 2,
     "Permission.ManageBookDock": 3,

server/test/e2e/authorization-matrix/route-inventory/routes-06.json

@@ -1,4 +1,40 @@
 [
+  {
+    "file": "server/src/modules/book-duplicates/book-duplicates.controller.ts",
+    "className": "BookDuplicatesController",
+    "methodName": "listDismissals",
+    "httpMethod": "GET",
+    "path": "/book-duplicates/dismissals",
+    "permissions": ["Permission.LibraryDeleteBooks"],
+    "libraryAccess": [],
+    "isPublic": false,
+    "allowDefault": false,
+    "useGuards": []
+  },
+  {
+    "file": "server/src/modules/book-duplicates/book-duplicates.controller.ts",
+    "className": "BookDuplicatesController",
+    "methodName": "dismissGroup",
+    "httpMethod": "POST",
+    "path": "/book-duplicates/dismissals",
+    "permissions": ["Permission.LibraryDeleteBooks"],
+    "libraryAccess": [],
+    "isPublic": false,
+    "allowDefault": false,
+    "useGuards": []
+  },
+  {
+    "file": "server/src/modules/book-duplicates/book-duplicates.controller.ts",
+    "className": "BookDuplicatesController",
+    "methodName": "restoreDismissal",
+    "httpMethod": "DELETE",
+    "path": "/book-duplicates/dismissals/:bookIdA/:bookIdB",
+    "permissions": ["Permission.LibraryDeleteBooks"],
+    "libraryAccess": [],
+    "isPublic": false,
+    "allowDefault": false,
+    "useGuards": []
+  },
   {
     "file": "server/src/modules/book-dock/book-dock.controller.ts",
     "className": "BookDockController",