fix(types): clean type fixes across 92 files

Apply proper TypeScript type corrections without any unsafe casts:
- Fix unknown/never/{} types from decompilation
- Correct function signatures and parameter types
- Add missing type declarations and interfaces
- Fix Ink component prop types
- Update API client/provider type annotations

Test files with mock data casts are included as-is (acceptable pattern).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/@ant/ink/utils/systemThemeWatcher.ts

@@ -0,0 +1,12 @@
+import type { SystemTheme } from '../src/theme/systemTheme.js'
+
+/**
+ * Watch for live terminal theme changes via OSC 11 polling.
+ * Stub implementation for the standalone @anthropic/ink package.
+ */
+export function watchSystemTheme(
+  _querier: unknown,
+  _setTheme: React.Dispatch<React.SetStateAction<SystemTheme>>,
+): () => void {
+  return () => {}
+}