Add comprehensive test coverage for settings view

[jpartovi]

Add comprehensive test coverage for settings view

Summary

This PR adds comprehensive test coverage for the settings view function in realworld/accounts/views.py (lines 46-61). The view previously had no test coverage. The new TestSettingsView test class includes 5 test methods that cover:

• Unauthenticated access: Verifies redirect to login page for unauthenticated users
• Authenticated GET request: Verifies form is displayed with current user data
• Valid POST request: Verifies user settings are successfully updated and user is redirected to profile
• Invalid POST request: Verifies form errors are returned for invalid data
• Password update: Verifies password can be optionally updated through the settings form

The tests follow existing patterns from TestRegisterView and TestFollowView in the same file, using setUpTestData, force_login, and checking both HTTP status codes and database state.

Test Results: All 18 tests in realworld.accounts pass successfully (13 existing + 5 new).

Review & Testing Checklist for Human

• Run python manage.py test realworld.accounts.tests.TestSettingsView to verify all 5 tests pass in your environment
• Manually test the settings page to confirm the test scenarios match actual behavior (especially the login redirect path and HTMX redirect header)
• Review the password update test to ensure it correctly validates the optional password field behavior in SettingsForm

Notes

• This is a test-only PR - no production code was modified
• Tests were verified locally with all 18 accounts tests passing
• Follows Django TestCase patterns consistent with existing test classes

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Link to Devin run: https://app.devin.ai/sessions/1a8d2469f5174b2ca7b0eaf5c3b52765
Requested by: Jude Partovi (@jpartovi)

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