fix(Headless): #3591928 Expose headless page helpers from isomorphic package entries

wotnakrequested to merge
issue/canvas-3591928:3591928-expose-headless-page-helpers-from-isomorphic-package-entries into 1.x

Closes #3591928 (closed)

  • moves exports around to expose page helpers from isomorphic entry instead of server only one

AI-Generated: Yes (Used AI coding agent to implement the refactor).

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