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>

e2e/harness/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "djarea-e2e-harness",
+  "name": "mizan-e2e-harness",
   "private": true,
   "type": "module",
   "scripts": {
@@ -7,7 +7,7 @@
     "dev": "vite --port 5174"
   },
   "dependencies": {
-    "@rythazhur/djarea": "file:../../react",
+    "@rythazhur/mizan": "file:../../react",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
     "zod": "^4.3.6"