Fix logout button rendering in error handlers

[chriscarrollsmith]

Summary

I've successfully resolved issue #141 by ensuring the logout button renders in exception handlers. Here's what I did:

Changes Made

1. Added get_user_from_request helper function in utils/core/dependencies.py:327-349

• This function extracts user information from request cookies without using Depends()
• Exception handlers can't use dependency injection, so this manual extraction is necessary

2. Updated exception handlers in main.py to pass user context to templates:

• password_validation_exception_handler (main.py:95-109)
• validation_exception_handler (main.py:114-165)
• http_exception_handler (main.py:170-177)
• general_exception_handler (main.py:182-196)

Testing & Quality Checks

• ✅ Linter (mypy): Passed with no issues
• ⚠️ Test suite: Could not fully run due to Docker not being available in this environment (database required)
• 120 tests passed that don't require database
• 135 tests errored due to missing database connection
• Tests will run properly in CI/CD with Docker available

Committed & Pushed

• Commit: db8d4a8 - "fix: ensure logout button renders in exception handlers by passing user context"
• Branch: claude/fix-logout-button-middleware-011CV4YMNuENtZof9YSuHSxf
• Successfully pushed to remote

The changes follow the same pattern used in the fork referenced in issue #141 and will ensure that logged-in users see the logout button on all error pages.

Fixes #141