Cannot revisit earlier section to get feedback

# Cannot revisit earlier section to get feedback

When a student returns to an earlier section of their essay (e.g., after writing the intro, going back to thesis), the chatbot screen loads but the text input is missing — so they can't actually receive feedback on that section.

**Status note (2026-05-08):** Fold this into [Free module navigation](../features/free-module-navigation.md). The product direction is no longer "patch revisit behavior inside a sequential flow"; it is to remove the sequential session gate and let students move freely between modules.

## Reproduction

1. As a student, work through the essay sections in order, getting feedback at each one.
2. Navigate back to a previously-completed section.
3. Click "Get feedback" or otherwise enter the chatbot view.

## Expected

The student sees the chatbot interface with a working text input and can request fresh feedback on the revised section.

## Actual

The chatbot screen renders, but no text input box appears. The student has no way to ask for feedback. Some prior context may be visible, but the interaction surface is dead.

## Impact

Breaks the iterative writing loop, which is a core value prop. A student who wants to refine an earlier section after seeing it in the larger context of the essay is forced to abandon their document and start over. Reported Feb 26, still active Apr 8.

## Affected versions

First reported 2026-02-26. Same symptom re-reported on 2026-04-08.

## Suspected cause

The chatbot view's text input may be conditionally rendered based on a "section-in-progress" flag that gets cleared once a section has been completed once. Revisiting flips into a read-only mode that wasn't intended.

## Workaround

Copy the text into a new document and request feedback there. Messy and breaks the link between original work and feedback history.