Question generator should generate unique questions

[kevinrawal]

Problem

The question generator currently reuses context from non-user input, which often causes new questions to be very similar to previously generated ones.

Goal

We need to improve the system so that:

1. Generated questions maintain uniqueness and quality.
2. Previous context is still available when we want to generate a “Part 2” or continuation.
3. User-driven question generation and auto-generated questions are handled separately.