Build fixes: offline-safe fonts, Next.js API route type updates, TS strict errors resolved, MUI import cleanup, chat markdown wrapper, Azure OpenAI typing, caching key + chapter API id types, and misc error-logging typings.

app/api/debug/schema/route.ts

@@ -18,7 +18,7 @@ export async function GET() {
     try {
       sampleUser = await prisma.$queryRaw`SELECT * FROM "User" LIMIT 1;`
     } catch (e) {
-      sampleUser = { error: 'Could not fetch sample user: ' + e.message }
+      sampleUser = { error: 'Could not fetch sample user: ' + ((e as any)?.message || e) }
     }
 
     return NextResponse.json({
@@ -29,7 +29,7 @@ export async function GET() {
     console.error('Schema debug error:', error)
     return NextResponse.json({
       error: 'Schema debug failed',
-      details: error.message
+      details: (error as any)?.message || error
     }, { status: 500 })
   }
-}
+}