fix(bruno-response): normalize response header name lookup to be case-insensitive

[abhishekp-bruno]

Description

res.getHeader(name) is now case-insensitive to ensure header lookups work regardless of the casing used in the header name.

Contribution Checklist:

• I've used AI significantly to create this pull request
• The pull request only addresses one issue or adds one feature.
• The pull request does not introduce any breaking changes
• I have added screenshots or gifs to help explain the change if applicable.
• I have read the contribution guidelines.
• Create an issue and link to the pull request.

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Publishing to New Package Managers

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Summary by CodeRabbit

• Bug Fixes
  • Header lookups are now case-insensitive, so header values are retrieved consistently regardless of letter casing.
  • Added automated tests covering mixed-case queries, array-valued headers, and missing headers to prevent regressions.

[coderabbitai]

Walkthrough

BrunoResponse#getHeader now lowercases requested header names before lookup. A Jest spec covers mixed-case retrieval, array-valued headers, and missing headers.

Changes

Header lookup fix

Layer / File(s)	Summary
Case-insensitive header lookup packages/bruno-js/src/bruno-response.js, packages/bruno-js/tests/bruno-response-get-header.spec.js	getHeader lowercases the input name before indexing headers; tests cover mixed-case lookup, array-valued headers, and missing headers.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Suggested reviewers: bijin-bruno

Poem

Headers shed their case,
Cookies keep their array shape,
Missing ones return—
A tiny lookup change blooms,
Tests mark the path.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: making response header lookup case-insensitive.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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