=== OLD create_prompt_library_tab() Implementation ===
Lines 2334-2458 in Supervertaler_v3.6.0-beta_CAT.py

Attempted to embed full side-by-side editor but had dependency issues with:
- Missing variable initializations (prompt_name_var, prompt_domain_var, etc.)
- Called _create_maximized_system_prompts() and _create_maximized_custom_instructions()
- These helper functions expected variables that didn't exist yet

=== OLD maximize_prompt_library() Implementation ===
Lines 2685-2950 in Supervertaler_v3.6.0-beta_CAT.py

Full-screen view with:
- Header with Restore button
- Active prompts bar
- PanedWindow with left (list) and right (editor)
- Tabs for System Prompts / Custom Instructions
- Shared editor widgets
- Helper functions: _create_maximized_system_prompts(), _create_maximized_custom_instructions()

=== Helper Functions ===
- _create_maximized_system_prompts() - Lines 2951-2984
- _create_maximized_custom_instructions() - Lines 2986-3030
- _on_maximized_tab_changed() - Lines 3032+ (had orphaned code with undefined activate_frame)

=== Problems ===
1. Missing StringVar initializations for metadata fields
2. Missing Text widget references
3. Helper functions expected instance variables that didn't exist at startup
4. _on_maximized_tab_changed() had broken code with undefined variables
5. Circular dependency between tab creation and helper functions
