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/app.py

@@ -1,9 +1,9 @@
 #!/usr/bin/env python
 """
-Djarea Desktop — PyWebView + Django local RPC.
+mizan Desktop — PyWebView + Django local RPC.
 
 Starts a local Django ASGI server and opens a native desktop window.
-All communication between the UI and backend uses Djarea server functions.
+All communication between the UI and backend uses mizan server functions.
 """
 
 import os
@@ -63,7 +63,7 @@ def main():
 
     base_url = f"http://{host}:{port}"
 
-    if not wait_for_server(f"{base_url}/api/djarea/session/"):
+    if not wait_for_server(f"{base_url}/api/mizan/session/"):
         print("ERROR: Django server failed to start", file=sys.stderr)
         sys.exit(1)
 
@@ -83,7 +83,7 @@ def main():
     import webview
 
     window = webview.create_window(
-        title="Djarea Desktop",
+        title="mizan Desktop",
         url=base_url,
         width=1024,
         height=768,