Hide navigation bar on native login view presentation

[sfdctaka]

Summary

• Hide the SFSDKNavigationController navigation bar when presenting custom native login view controllers in presentLoginView:
• Previously, the wrapping nav controller's bar (styled with Salesforce blue) was visible by default. SFLoginViewController hides it internally, but custom native login VCs had no such handling — resulting in an unwanted nav bar appearing on top of the app's login UI, especially on re-presentation after fallback-to-web-auth → back
• Add unit test verifying the navigation bar is hidden when a native login VC is presented

Test plan

• New unit test testNativeLoginPresentationHidesNavigationBar passes
• Test correctly fails when the fix is reverted
• All existing NativeLoginManagerTests pass
• Manual verification: use an app with custom native login, trigger fallback to web auth, press back — confirm no blue nav bar appears

[github-actions]

	1 Warning
⚠️	Static Analysis found an issue with one or more files you modified. Please fix the issue(s).

Clang Static Analysis Issues

File	Type	Category	Description	Line	Col
SFUserAccountManager	Nullability	Memory error	Null passed to a callee that requires a non-null 2nd parameter	1579	15
SFUserAccountManager	Nullability	Memory error	Null passed to a callee that requires a non-null 2nd parameter	1594	15
SFUserAccountManager	Nullability	Memory error	nil passed to a callee that requires a non-null 2nd parameter	2229	13

Generated by 🚫 Danger

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.73%. Comparing base (439d33e) to head (6c4b0f2).

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #4040      +/-   ##
==========================================
- Coverage   70.62%   65.73%   -4.90%     
==========================================
  Files         245      245              
  Lines       21457    21458       +1     
==========================================
- Hits        15155    14105    -1050     
- Misses       6302     7353    +1051     

Components	Coverage Δ
Analytics	70.78% <ø> (ø)
Common	71.25% <ø> (+0.27%)	⬆️
Core	57.78% <100.00%> (-7.63%)	⬇️
SmartStore	73.44% <ø> (ø)
MobileSync	88.79% <ø> (ø)

Files with missing lines	Coverage Δ
...SDKCore/Classes/UserAccount/SFUserAccountManager.m	44.01% <100.00%> (-17.76%)	⬇️

... and 36 files with indirect coverage changes

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[github-actions]

	Tests	Passed	Skipped	Failed ❌️
AuthFlowTester UI Test Results all	1 ran			1 ❌

Test	Result
AuthFlowTester UI Test Results all
AuthFlowTesterUITests.xctest
LegacyLoginTests.testCAOpaque_DefaultScopes_WebServerFlow()	❌ failure

• View AuthFlowTester UI Test Results all

[github-actions]

	Tests	Passed ☑️	Skipped	Failed ❌️
SalesforceSDKCore iOS ^26 Test Results	632 ran	630 ✅		2 ❌

Test	Result
SalesforceSDKCore iOS ^26 Test Results
SFUserAccountManagerTests.testUserAccountEncoding	❌ failure
SalesforceRestAPITests.testCreateQuerySearchDelete	❌ failure

• View SalesforceSDKCore iOS ^26 Test Results

[github-actions]

	Tests	Passed ☑️	Skipped	Failed ❌️
SalesforceSDKCore iOS ^18 Test Results	632 ran	631 ✅		1 ❌

Test	Result
SalesforceSDKCore iOS ^18 Test Results
testCallbackSuccess()	❌ failure

• View SalesforceSDKCore iOS ^18 Test Results