init: add source code from src.zip

src/services/compact/compactWarningHook.ts

@@ -0,0 +1,16 @@
+import { useSyncExternalStore } from 'react'
+import { compactWarningStore } from './compactWarningState.js'
+
+/**
+ * React hook to subscribe to compact warning suppression state.
+ *
+ * Lives in its own file so that compactWarningState.ts stays React-free:
+ * microCompact.ts imports the pure state functions, and pulling React into
+ * that module graph would drag it into the print-mode startup path.
+ */
+export function useCompactWarningSuppression(): boolean {
+  return useSyncExternalStore(
+    compactWarningStore.subscribe,
+    compactWarningStore.getState,
+  )
+}