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>

react/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "@rythazhur/djarea",
+  "name": "@rythazhur/mizan",
   "version": "0.1.1",
   "type": "module",
   "main": "dist/index.js",
@@ -39,7 +39,7 @@
     }
   },
   "bin": {
-    "djarea-generate": "./dist/generator/cli.mjs"
+    "mizan-generate": "./dist/generator/cli.mjs"
   },
   "scripts": {
     "build": "tsc -p tsconfig.build.json && node -e \"require('fs').cpSync('src/generator','dist/generator',{recursive:true})\"",