revert: undo SPA implementation - return to multi-window dialogs

Revert all SPA (Single Page Application) changes and return to the
proven multi-window dialog architecture.

Reason: SPA implementation caused multiple issues:
- Black screen overlay problems
- Z-order conflicts between panel and overlay
- CustomTkinter limitations with semi-transparent backgrounds
- Complex positioning issues
- User experience degraded instead of improving

Reverted changes:
- Deleted SlideInPanel component
- Deleted all inline forms (EmployeeFormInline, CacesFormInline, MedicalVisitFormInline)
- Restored original dialog-based views (EmployeeFormDialog, CacesFormDialog, MedicalVisitFormDialog)
- EmployeeListView and EmployeeDetailView back to using wait_window() dialogs
- Deleted SPA-related tests

Current state:
- Back to multi-window experience (working)
- Dialogs open in separate windows
- All functionality preserved
- No black screen issues
- Forms work correctly

The multi-window architecture, while not ideal, is stable and functional.
Future SPA attempts should:
1. Use a framework that supports proper overlays/transparency
2. Better understand CustomTkinter limitations first
3. Prototype more thoroughly before committing
4. Consider alternative approaches like web-based solutions

Resolves: SPA implementation issues
Restores: v2.1.4 functionality

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: codewizdave

.claude/settings.local.json

@@ -27,7 +27,8 @@
       "Bash(python:*)",
       "Bash(git tag:*)",
       "Bash(git show:*)",
-      "Bash(dir:*)"
+      "Bash(dir:*)",
+      "Bash(git push:*)"
     ]
   }
 }