* fix: sequential progression bug in course with ordered contents
* test(utils): add course progression tests and unify navigation ordering
Reuse flattenNavigableItems in getOrderedNavigableContent so next/previous
navigation follows the same section-aware order as progression locks.
Add vitest coverage for grouped multi-section flattening and sequential
access rules.
Co-authored-by: Rotimi Best <[email protected]>
* fix: address PR review comments for course progression
Simplify grouped flatten ordering, only block progression for lessons and
exercises explicitly, integrate flattenNavigableItems in the sequential access
test, and include @cio/core watch in api:dev:full.
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