fix: adapt TemplateResponse calls to Starlette 1.0 new-style API

Starlette 1.0.0 changed TemplateResponse signature from
(name, context_dict) to (request, name, context=dict).

- Update base.py wrapper to convert old-style calls to new-style
- Update main.py error handler TemplateResponse calls
- Update local_auth.py, billing.py, auth.py, share.py calls
- Update test mocks for new calling convention

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>
Agent-Logs-Url: https://github.com/christianlouis/DocuElevate/sessions/7b5f7e0d-89ad-43be-b68d-a9c0c5407a7e

app/main.py

@@ -425,14 +425,14 @@ async def http_exception_handler(request: Request, exc: HTTPException):
     # Handle 404 errors with a custom template
     if exc.status_code == 404:
         return _error_templates.TemplateResponse(
-            "404.html", {"request": request}, status_code=status.HTTP_404_NOT_FOUND
+            request, "404.html", status_code=status.HTTP_404_NOT_FOUND
         )
 
     # For other HTTP errors, we could create specific templates or use a generic one
     # For now, return a simple error page
     return _error_templates.TemplateResponse(
+        request,
         "404.html",  # Reuse 404 template for other errors, or create a generic error template
-        {"request": request},
         status_code=exc.status_code,
     )
 
@@ -452,8 +452,9 @@ async def custom_500_handler(request: Request, exc: Exception):
 
     # Serve the 500 template for non-API routes
     return _error_templates.TemplateResponse(
+        request,
         "500.html",
-        {"request": request, "exc": exc},
+        context={"exc": exc},
         status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
     )