Add comprehensive request specs for ErrorsController

[stefan-burke]

Summary

• Adds extensive request specs for ErrorsController covering 404 and 500 error responses
• Tests HTML, JSON, XML, and plain text response formats
• Verifies Sentry exception capturing behavior in production and non-production environments

Changes

Request Specs for ErrorsController

• Created spec/requests/errors_controller_spec.rb with 150 lines of tests
• Tests for GET /404 and GET /500 endpoints
• Validates correct HTTP status codes and response bodies for different formats:
  • HTML: renders error page with localized titles and messages
  • JSON: returns JSON error response with correct content type
  • XML and text: returns only status code with blank body

Sentry Exception Capture Tests

• Mocks Rails environment to test production vs non-production behavior
• Confirms Sentry captures exceptions only in production when exceptions are present
• Ensures no Sentry capture occurs when no exception is present or in non-production environments

Test plan

• Run RSpec suite to verify all new request specs pass
• Confirm coverage increase for ErrorsController
• Validate Sentry integration behavior through mocks and expectations

🌿 Generated by Terry

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📎 Task: https://www.terragonlabs.com/task/2ecb15d6-213d-42dc-8a30-4b6c935242c5