Multiple TaskFactory.create(1, {id: N, ...}, false) calls for the same
project were all defaulting to index=1 (from {increment} with count=1),
which collides on the newly added UNIQUE(project_id, index) constraint.
Mirror the numeric id override to index so each row stays unique and
matches the id == index convention used by raw seedTasks helpers.
Fixes the e2e playwright seed failures in subtask-duplicates, list/table
filter/search, kanban filter/search, and overview specs.
c06a33fb63