chore: refactor return type of resolveDimensions

[frederickfogerty]

This is part of the Gatsby fp-ts refactor.

[frederickfogerty]

Current dependencies on/for this PR:

• main
  • PR #198
  • PR #197 (this PR)
    • PR #199
    • PR #201
      • PR #202
      • PR #203
        • PR #204
        • PR #205
          • PR #206
          • PR #207
            • PR #208
            • PR #209

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