Reset exercise-local state when redoing wrong answers

[coderabbitai]

Summary

The Finish session → Redo Wrong flow can replace the active exercise while Exercise remains mounted. Its component-local answer and isCorrect signals may then retain the previous exercise's state.

Required changes

Ensure that selecting Redo Wrong cannot display or submit stale answer/result state for the next exercise. Either:

• reset the local exercise state whenever props.exercise changes, or
• remount Exercise using a stable exercise identity.

Rationale

The redo flow updates the exercise queue independently of handleNext(), which is currently the path that clears the local input and correctness state.

Affected area

• src/components/solid/Exercise/Exercise.tsx
• Exercise session flow in src/components/solid/Exercise/Exercises.tsx

Acceptance criteria

• After answering an exercise incorrectly, choosing Finish session → Redo Wrong clears the input and removes the previous correct/incorrect result before the next answer is checked.
• The next submission is evaluated against the newly active exercise.
• Existing normal next-exercise behavior remains unchanged.

Backlinks

• Pull request: add wrap up #295
• Review discussion: add wrap up #295 (comment)

[coderabbitai]

🔗 Related PRs

#286 - split grammar points and exercises [merged]
#288 - restructure practice page [merged]
#295 - add wrap up [open]

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