feat(authors): collapse series on author pages (#1271)

Reduce large author listings to one card per series while preserving book counts, scoped visibility, and row-based pagination. Compute both totals in the collapsed query so deep pages remain consistent without a second author-wide scan.

Closes #301

Co-authored-by: neon <18559658+neonsolstice@users.noreply.github.com>

scripts/e2e/suite-registry.mjs

@@ -351,6 +351,27 @@ export const E2E_SUITES = Object.freeze({
       ...SHARED_DB_AND_HELPER_PATHS,
     ],
   },
+  "author-books-collapse": {
+    id: "author-books-collapse",
+    name: "Author Books Collapse",
+    timeout: 60,
+    lane: "full",
+    description: "Author page series collapsing, and the row and book counts it reports",
+    vitestTarget: "test/author-books-collapse.e2e-spec.ts",
+    junitOutput: `${TEST_RESULTS_DIR}/author-books-collapse-e2e-junit.xml`,
+    prepareDedicatedDatabase: true,
+    useDedicatedDatabase: true,
+    changedPaths: [
+      "server/src/modules/authors/**",
+      "server/src/modules/book/book.repository.ts",
+      "server/src/modules/book/book-read.service.ts",
+      "server/test/author-books-collapse.e2e-spec.ts",
+      "server/test/e2e/authorization-matrix/**",
+      ".github/workflows/e2e-runner.yml",
+      "packages/types/src/author.ts",
+      ...SHARED_DB_AND_HELPER_PATHS,
+    ],
+  },
   "series-next-book": {
     id: "series-next-book",
     name: "Series Next Book",