fix(admin): enable bulk actions in grouped articles view

- dev_run.sh: also remove app.db-shm and app.db-wal on reset to fix
  SQLite disk I/O error from stale WAL/SHM files
- articles bulk: add checkboxes to grouped rows (data-ids holds all
  variant IDs); checking a group selects EN+DE together
- restore select-all checkbox in grouped <th>
- add toggleArticleGroupSelect() JS function
- fix htmx:afterSwap to re-check group checkboxes correctly

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/scripts/dev_run.sh

@@ -48,7 +48,7 @@ PADDLE_ENVIRONMENT=${PADDLE_ENVIRONMENT:-sandbox}
 # -- Preparation -------------------------------------------------------------
 
 info "Resetting database"
-rm -f "$DATABASE_PATH"
+rm -f "$DATABASE_PATH" "${DATABASE_PATH}-shm" "${DATABASE_PATH}-wal"
 ok "Removed $DATABASE_PATH"
 
 info "Running migrations"