initial commit

web/src/components/use-admin-theme.ts

@@ -0,0 +1,19 @@
+import { useContext } from 'react'
+
+import { AdminThemeContextInstance, type AdminThemeValue } from './admin-theme-context'
+
+/**
+ * Reads the admin theme context.
+ *
+ * Throws when used outside a provider rather than returning a default. A silent
+ * default would let a component render with the wrong theme and never report the
+ * mistake, which is exactly the class of bug this codebase's tooling exists to
+ * surface.
+ */
+export function useAdminTheme(): AdminThemeValue {
+  const value = useContext(AdminThemeContextInstance)
+  if (!value) {
+    throw new Error('useAdminTheme must be used inside an AdminThemeProvider')
+  }
+  return value
+}