Auto-advance to next exercise after success , test case pass

[radhaprajapath1]

Right now, once checks pass and the # I AM NOT DONE marker is manually remove. we navigate to the next exercise. This adds a bit of friction to what's otherwise a really smooth edit-check loop.

A couple of ideas to make the "success → next exercise" transition feel more seamless:

Option A: Timed auto-advance
When an exercise passes, show a success state for ~3–5 seconds (checkmark, "✓ Solved!" message, etc.) and then automatically move to the next exercise. This keeps the learner in flow without needing to press anything.

Option B: Enter-to-continue
Instead of (or in addition to) a timer, once the exercise is marked complete, pressing Enter immediately advances to the next one. This gives the learner control over pacing — they can pause to read the success message, then hit Enter when ready, rather than being forced into a fixed delay.

Possible combination: show the success state indefinitely, but allow both a short auto-advance timer and an Enter override, so quick learners aren't stuck waiting and slower learners aren't rushed.

[radhaprajapath1]

PR with the suggestions as of now , have added message displaying the timer

PR Link -> #129