fix(reader): sync progress between an EPUB and its read-along copy

Carry positions between sibling EPUBs even without an audiobook, and keep
narration markers on the read-along file only. Point the KOReader book panel
and hold release at the copy devices sync, and label EPUB-only sync in the
read-aloud panel.

Fixes #1508

scripts/e2e/suite-registry.mjs

@@ -735,6 +735,29 @@ export const E2E_SUITES = Object.freeze({
       ...SHARED_DB_AND_HELPER_PATHS,
     ],
   },
+  "koreader-readaloud-progress": {
+    id: "koreader-readaloud-progress",
+    name: "KOReader Read-Along Sibling Progress",
+    timeout: 45,
+    lane: "full",
+    description: "KOReader and web reader positions carried between an EPUB and its Storyteller read-along copy",
+    vitestTarget: "test/koreader-readaloud-progress.e2e-spec.ts",
+    junitOutput: `${TEST_RESULTS_DIR}/koreader-readaloud-progress-e2e-junit.xml`,
+    prepareDedicatedDatabase: true,
+    useDedicatedDatabase: true,
+    changedPaths: [
+      "server/src/modules/koreader/**",
+      "server/src/modules/book/audiobook-ebook-progress-sync.service.ts",
+      "server/src/modules/book/book.repository.ts",
+      "server/src/modules/book/book.service.ts",
+      "server/src/modules/position-converter/**",
+      "server/src/modules/reader/epub/**",
+      "server/src/common/utils/primary-file-selection.utils.ts",
+      "server/test/koreader-readaloud-progress.e2e-spec.ts",
+      "server/test/e2e/reader-state-isolation/**",
+      ...SHARED_DB_AND_HELPER_PATHS,
+    ],
+  },
   "koreader-file-naming": {
     id: "koreader-file-naming",
     name: "KOReader File Naming",