Rename djarea to mizan and fix React casing conventions

Rename the package from djarea to mizan across the entire codebase —
Python package, React library, generators, tests, and examples. Fix
JSX/hook casing (MizanProvider, useMizan, etc.) that broke when the
original PascalCase names were lowercased during the rename.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

desktop/backend/asgi.py

@@ -6,8 +6,8 @@ os.environ.setdefault("DJANGO_SETTINGS_MODULE", "backend.settings")
 django.setup()
 
 from django.core.asgi import get_asgi_application
-from djarea import wrap_asgi
+from mizan import wrap_asgi
 
-import backend.djarea_clients  # noqa: F401
+import backend.mizan_clients  # noqa: F401
 
 application = wrap_asgi(get_asgi_application())