Add a flat case-key mapper for the gift-links codec and serializer

[rob-ghost]

Problem

The gift-links codec (database row to domain) and the response serializer (domain to API) each mapped fields with hand-written snake_case to camelCase object literals. The field list was repeated across the row schema, the domain schema, and the literal bodies, and it was hard to tell the deliberate, type-checked projection from incidental boilerplate.

Solution

Replace the literals in both places with a small in-house flat key mapper. It renames top-level keys only and copies values by reference, so the branded token, dates and nulls pass through untouched. The codec and the response schema still check the result, so adding, removing, or retyping any field - the token included - is a compile error, not a runtime surprise or a silent pass-through.

A deep third-party case-convert library was evaluated and rejected: it recurses into value types and mangles the branded token type, so it could not type-check the serializer at all.

Stacked on #28809. Retargets to main once that merges.

[coderabbitai]

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title accurately describes the main change: replacing hand-written case mappers with the ts-case-convert library in the gift-links codec.
Description check	✅ Passed	The description provides clear context about the problem (field duplication), solution (using ts-case-convert), and rationale (type safety and clarity).

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/gift-links-codec-case-convert

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[nx-cloud]

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☁️ Nx Cloud last updated this comment at 2026-06-23 00:27:38 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (chore/gift-links-colocate-db-concerns@77a8b3b). Learn more about missing BASE report.

Additional details and impacted files

@@                           Coverage Diff                            @@
##             chore/gift-links-colocate-db-concerns   #28811   +/-   ##
========================================================================
  Coverage                                         ?   73.83%           
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  Files                                            ?     1558           
  Lines                                            ?   134537           
  Branches                                         ?    16175           
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  Hits                                             ?    99331           
  Misses                                           ?    34197           
  Partials                                         ?     1009           

Flag	Coverage Δ
admin-tests	55.16% <ø> (?)
e2e-tests	75.93% <100.00%> (?)

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