026.04 Switch Screens

Description

As a Researcher, I want to navigate between different views (coding, sources, analysis) so that I can access different functionality.

Acceptance Criteria

• [ ] #1 I can switch to the Coding screen
• [ ] #2 I can switch to the Sources screen
• [ ] #3 I can switch to the Analysis screen
• [ ] #4 My current context is preserved when switching
• [ ] #5 Keyboard shortcuts are available for quick navigation