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/src/generator/lib/fetch.mjs

@@ -1,7 +1,7 @@
 /**
  * Schema Fetching
  *
- * Fetches djarea and channels schemas from Django management commands.
+ * Fetches mizan and channels schemas from Django management commands.
  */
 
 import { spawn } from 'child_process'
@@ -78,11 +78,11 @@ export async function fetchChannelsSchema(source, cwd) {
 }
 
 /**
- * Fetch djarea schema from Django.
+ * Fetch mizan schema from Django.
  */
-export async function fetchDjareaSchema(source, cwd) {
+export async function fetchMizanSchema(source, cwd) {
   if (!source.django) {
-    throw new Error('Djarea schema export requires django source configuration')
+    throw new Error('mizan schema export requires django source configuration')
   }
-  return runDjangoCommand(source, cwd, 'export_djarea_schema')
+  return runDjangoCommand(source, cwd, 'export_mizan_schema')
 }