fix: use resolve headers in Context.headers fallback

[MegaManSec]

Summary by CodeRabbit

• Bug Fixes
  • Fixed type checking for request headers configuration to correctly validate header definitions.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 98f9df70-ed27-4298-81d3-87250d112675

📥 Commits

Reviewing files that changed from the base of the PR and between 169e54a and aac91aa.

📒 Files selected for processing (1)

• src/context.ts

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Walkthrough

A single-line type definition correction in the Context type, changing the conditional check for the headers property from incorrectly referencing Singleton['resolve']['query'] to the correct Singleton['resolve']['headers'].

Changes

Cohort / File(s)	Summary
Type Definition Fix src/context.ts	Fixed the conditional type check for the headers property in the Context type. Changed from checking NonNullable<Singleton['resolve']['query']> to NonNullable<Singleton['resolve']['headers']>, ensuring the correct branch is evaluated for header type resolution.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A tiny typo in the types we see,
Query became headers—oops, wasn't meant to be!
One line fixed, the logic now true,
Headers resolve just as they should do! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: fixing a conditional check in Context.headers to use resolve headers instead of resolve query.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

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• Create PR with unit tests
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