The worksheet generator was hardcoding answer computation for specific
schemas (two-digit-subtraction, fractions, linear equations) and
returning "?" for any unknown schema like custom flowcharts.
Now uses the centralized formatAnswerDisplay() function which properly
handles:
- Custom display.answer expressions defined in the flowchart
- Computed variables from the flowchart definition
- Schema-specific fallback logic
- The generation.target fallback for custom schemas
This fixes PDF worksheets showing "?" answers for teacher-created
flowcharts like "math duck maker" while the debug panel showed
correct answers.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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