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

tests/test_dark_mode.py

@@ -55,8 +55,8 @@ class TestDarkModeTemplateInjection:
 
         captured = {}
 
-        def fake_original(name, ctx, **kw):
-            captured.update(ctx)
+        def fake_original(request_obj, name, context=None, **kw):
+            captured.update(context or {})
 
         with patch("app.views.base.original_template_response", side_effect=fake_original):
             mock_request = MagicMock()
@@ -73,8 +73,8 @@ class TestDarkModeTemplateInjection:
 
         captured = {}
 
-        def fake_original(name, ctx, **kw):
-            captured.update(ctx)
+        def fake_original(request_obj, name, context=None, **kw):
+            captured.update(context or {})
 
         with patch("app.views.base.original_template_response", side_effect=fake_original):
             mock_request = MagicMock()