Next button stuck moving between sections

# Next button stuck moving between sections

Students click "Next" to move to the following section (e.g., thesis → intro paragraph) and the UI stays on the current step. Reported by 5 students in one class.

## Reproduction

1. As a student, complete a section in the writing flow.
2. Click the "Next" button to advance to the following section.
3. Observe that the UI does not transition.

## Expected

The next section loads and the student continues writing.

## Actual

Clicking "Next" leaves the student on the same step. Repeated clicks have no effect.

## Impact

Hard block on completing the writing flow for affected students. 5 students hit this in one report — not a one-off. Reported 2026-04-21.

## Affected versions

Reported 2026-04-21.

## Suspected cause

The transition guard may require some state to be set (e.g., feedback received, minimum word count) that isn't being met but isn't communicated to the user. Alternatively, the click handler is firing but the state machine fails silently. Add logging on transition attempts.

Fold into [Free module navigation](../features/free-module-navigation.md). This should stop being a guarded "advance" state transition; moving between modules should become direct navigation over the assignment type's module order.

## Workaround

Refresh the page. Sometimes works.