Load-bearing first migration (ADR-012): this is the hardest case — its
enhance submit callback actually fires and reads the form result. Replaces
the duplicated 23-line interceptor factory with vi.mock('$app/forms',
() => ({ ...formsMock })) via $mocks, and the per-test mockFormResult
mutation with formsMock.setFormResult({ type: 'failure' }). The reset now
comes from the shared module's embedded beforeEach. The existing
optimisticMarkRead/optimisticMarkAllRead-on-submit assertions remain as the
positive proof the callback fired. Part of #560.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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