fix(sdk): omit defaulted screen_hint from auth URLs

[gjtorikian]

Closes #395

[greptile-apps]

Greptile Summary

Fixes getAuthorizationUrl so screen_hint is only included in the generated URL when the caller explicitly provides it, rather than always defaulting to sign-in.

• $screenHint is now nullable with a null default; the null-safe ?->value access lets the existing array_filter strip the key cleanly.
• A new runtime behaviour test (testAuthorizationUrlOmitsScreenHintUnlessProvided) asserts the query string is free of screen_hint when no value is passed.

Confidence Score: 5/5

Safe to merge — the change is minimal, correctly scoped, and directly tested.

The fix is a one-liner in the method signature and a single null-safe operator addition; the existing array_filter already handles the omission correctly, and the new test confirms the end-to-end behaviour. No other code paths are affected.

No files require special attention.

Important Files Changed

Filename	Overview
lib/Service/UserManagement.php	Makes $screenHint nullable (default null) and guards ->value access with the null-safe operator; array_filter already strips null entries so the field is correctly omitted when absent.
tests/Service/RuntimeBehaviorTest.php	Adds testAuthorizationUrlOmitsScreenHintUnlessProvided which asserts screen_hint is absent from the generated URL when the parameter is not supplied.

Sequence Diagram

sequenceDiagram
    participant Caller
    participant getAuthorizationUrl
    participant array_filter
    participant buildUrl

    Caller->>getAuthorizationUrl: "call (screenHint = null, default)"
    getAuthorizationUrl->>array_filter: "query map with screen_hint => null"
    array_filter-->>getAuthorizationUrl: screen_hint key removed
    getAuthorizationUrl->>buildUrl: query without screen_hint
    buildUrl-->>Caller: URL (no screen_hint param)

    Caller->>getAuthorizationUrl: "call (screenHint = SignIn explicitly)"
    getAuthorizationUrl->>array_filter: "query map with screen_hint => sign-in"
    array_filter-->>getAuthorizationUrl: screen_hint retained
    getAuthorizationUrl->>buildUrl: "query with screen_hint=sign-in"
    buildUrl-->>Caller: "URL (screen_hint=sign-in present)"

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_{Reviews (1): Last reviewed commit: "fix(sdk): omit defaulted screen_hint fro..." | Re-trigger Greptile}

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 2 additional findings.