test: reconcile build-theme tests with nested syntax format

The converter reads theme.json's nested "syntax" shape: each category is an object with fg/bg/bold/italic, and bg/p are category objects carrying fg. The tests still drove the old flat "assignments"/"bold"/"italic" format with 3-arg syntax calls, so they passed only against a stale build-theme.elc. Rebuilt against the source, six tests failed on the wrong API.

I updated the fixture JSON and every call site to the nested 1-arg signature. No production code changed. The converter and theme.json were already the source of truth.

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