fix: support socks5h:// scheme in SOCKS_PROXY_HOST regex

[Matobi98]

Fixes SOCKS_PROXY_HOST regex to match the socks5h:// scheme (regression from #826), found while testing #885.

Summary by CodeRabbit

• Bug Fixes
  • SOCKS proxy URL validation now supports the socks, socks4, socks5, and socks5h schemes.
  • The unsupported socks4h scheme now receives the default socks5:// prefix.

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Review details

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: a18de3db-6a8f-446d-a29b-5b5da3ab7a61

📥 Commits

Reviewing files that changed from the base of the PR and between b965749 and 7b568b6.

📒 Files selected for processing (3)

• app.ts
• tests/util/index.spec.ts
• util/index.ts

Walkthrough

The SOCKS proxy URL validation now explicitly accepts socks, socks4, socks5, and socks5h. The socks4h scheme is no longer recognized and receives the default socks5:// prefix.

Changes

SOCKS scheme validation

Layer / File(s)	Summary
Recognize supported SOCKS schemes app.ts	The validation pattern explicitly accepts four SOCKS schemes and excludes socks4h.

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

Poem

A rabbit checks the proxy line,
Four SOCKS schemes now align.
socks4h hops away,
socks5h is here to stay.
The prefix rules are clear.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the main change: adding support for the socks5h:// scheme in the SOCKS_PROXY_HOST regex.
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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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@app.ts`:
- Line 53: Update the proxy-scheme validation in the proxyUrl assignment to use
an explicit case-insensitive allowlist accepting only socks://, socks4://,
socks5://, and socks5h://; reject socksh:// and socks4h:// before constructing
proxyUrl.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: e884ecc4-5b53-437c-87de-aac0611d9db5

📥 Commits

Reviewing files that changed from the base of the PR and between a29b8a4 and 02eae10.

📒 Files selected for processing (1)

• app.ts

[knocte]

If there was a recent regression, it means we lacked a test, so please create a test now so that it doesn't happen again.