refactor: guard text selection event target

[uno-prod-internal-app]

Summary

• replace the MouseEvent.target type assertion in useTextSelection with an instanceof Node runtime guard
• treat null or non-Node event targets as outside the scoped element
• keep the change isolated to the outside-click selection reset

Validation

• pnpm --filter rooks exec vitest run src/__tests__/useTextSelection.spec.tsx (23 passed)
• pnpm --filter rooks test (2,303 passed, 21 skipped)
• pnpm --filter rooks exec tsc --noEmit -p tsconfig.json
• pnpm --filter rooks exec eslint src/hooks/useTextSelection.ts (0 errors; 1 pre-existing ref-access warning)
• pnpm --filter rooks exec prettier --check src/hooks/useTextSelection.ts
• git diff --check main..HEAD

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Project	Deployment	Actions	Updated (UTC)
rooks	Ready	Preview	Aug 22, 2026 12:14am

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