feat(scholars): add multiselect and bulk actions (delete, toggle, export)

Add Set<number>-based selection state to ScholarsPage with checkboxes
in both table and card views, select-all toggle, and stale-key pruning.

Backend: POST /scholars/bulk-delete, POST /scholars/bulk-toggle, and
GET /scholars/export?ids= filter. Service functions use user-scoped
queries. Structured logging for bulk operations.

Frontend: useScholarBulkActions composable extracts selection and bulk
action logic. AppSelect-based action dropdown with dynamic options.
Delete prompts window.confirm; enable/disable applies immediately.
Export downloads filtered JSON.

Includes integration tests for all bulk endpoints and frontend unit
tests for selection toggle, select-all, and stale pruning.

app/services/portability/exporting.py

@@ -56,11 +56,14 @@ async def export_user_data(
     db_session: AsyncSession,
     *,
     user_id: int,
+    scholar_profile_ids: list[int] | None = None,
 ) -> dict[str, Any]:
-    scholars_result = await db_session.execute(
-        select(ScholarProfile).where(ScholarProfile.user_id == user_id).order_by(ScholarProfile.id.asc())
-    )
-    publication_result = await db_session.execute(
+    scholar_query = select(ScholarProfile).where(ScholarProfile.user_id == user_id)
+    if scholar_profile_ids:
+        scholar_query = scholar_query.where(ScholarProfile.id.in_(scholar_profile_ids))
+    scholars_result = await db_session.execute(scholar_query.order_by(ScholarProfile.id.asc()))
+
+    pub_query = (
         select(
             ScholarProfile.scholar_id,
             Publication.cluster_id,
@@ -77,8 +80,13 @@ async def export_user_data(
         .join(ScholarPublication, ScholarPublication.scholar_profile_id == ScholarProfile.id)
         .join(Publication, Publication.id == ScholarPublication.publication_id)
         .where(ScholarProfile.user_id == user_id)
-        .order_by(ScholarPublication.created_at.desc(), Publication.id.desc())
     )
+    if scholar_profile_ids:
+        pub_query = pub_query.where(ScholarProfile.id.in_(scholar_profile_ids))
+    publication_result = await db_session.execute(
+        pub_query.order_by(ScholarPublication.created_at.desc(), Publication.id.desc())
+    )
+
     scholars = [_serialize_export_scholar(profile) for profile in scholars_result.scalars().all()]
     publications = [_serialize_export_publication(row) for row in publication_result.all()]
     return {

app/services/scholars/application.py

@@ -27,10 +27,61 @@ from app.services.scholars.validators import (
     validate_scholar_id,
 )
 
+async def bulk_delete_scholars(
+    db_session: AsyncSession,
+    *,
+    user_id: int,
+    scholar_profile_ids: list[int],
+    upload_dir: str | None = None,
+) -> int:
+    from sqlalchemy import select
+
+    result = await db_session.execute(
+        select(ScholarProfile).where(
+            ScholarProfile.id.in_(scholar_profile_ids),
+            ScholarProfile.user_id == user_id,
+        )
+    )
+    profiles = list(result.scalars().all())
+    if not profiles:
+        return 0
+    if upload_dir:
+        upload_root = _ensure_upload_root(upload_dir, create=True)
+        for profile in profiles:
+            _safe_remove_upload(upload_root, profile.profile_image_upload_path)
+    for profile in profiles:
+        await db_session.delete(profile)
+    await db_session.commit()
+    return len(profiles)
+
+
+async def bulk_toggle_scholars(
+    db_session: AsyncSession,
+    *,
+    user_id: int,
+    scholar_profile_ids: list[int],
+    is_enabled: bool,
+) -> int:
+    from sqlalchemy import update
+
+    result = await db_session.execute(
+        update(ScholarProfile)
+        .where(
+            ScholarProfile.id.in_(scholar_profile_ids),
+            ScholarProfile.user_id == user_id,
+        )
+        .values(is_enabled=is_enabled)
+    )
+    await db_session.commit()
+    return result.rowcount  # type: ignore[return-value]
+
+
 __all__ = [
     "SEARCH_COOLDOWN_REASON",
     "SEARCH_DISABLED_REASON",
     "ScholarServiceError",
+    "bulk_delete_scholars",
+    "bulk_toggle_scholars",
     "clear_profile_image_customization",
     "create_scholar_for_user",
     "delete_scholar",