fix: parse oauth auto redirect environment flag

[joshtgl]

Description

Last update to parse the new OAUTH_AUTO_REDIRECT value with the parseEnvBoolean function.

Checklist

• I have read CONTRIBUTING.md in its entirety
• I have performed a self-review of my own code
• I have added unit tests to cover my changes
• The last commit successfully passed pre-commit checks
• Any AI code was thoroughly reviewed by me

Summary by CodeRabbit

• Bug Fixes
  • Improved handling of the automatic OAuth redirect setting by consistently interpreting its configured true/false value.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: cb197783-ab94-4c41-9a6e-2c085862bf04

📥 Commits

Reviewing files that changed from the base of the PR and between 13495df and f151eb0.

📒 Files selected for processing (1)

• src/env.ts

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📝 Walkthrough

Walkthrough

OAUTH_AUTO_REDIRECT now uses the shared parseEnvBoolean helper in src/env.ts.

Changes

OAuth environment parsing

Layer / File(s)	Summary
Use shared boolean parser src/env.ts	OAUTH_AUTO_REDIRECT now uses parseEnvBoolean instead of direct JSON.parse handling.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• oss-apps/split-pro#690: Updates the OAUTH_AUTO_REDIRECT parsing in src/env.ts.
• oss-apps/split-pro#718: Introduces the shared parseEnvBoolean parsing pattern in src/env.ts.

Suggested reviewers: krokosik

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the change to environment flag parsing.
Description check	✅ Passed	The description summarizes the change and completes the checklist, but it omits the optional Demo section and confirms that no tests were added.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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