feat(directory): copy icon names on click

[huytdps13400]

Summary

• make each directory icon card a semantic button that copies its icon name
• show hover/focus guidance and accessible copied feedback for 1.8 seconds
• add regression coverage for clipboard writes and feedback reset

Closes #1904

Verification

• CI=true pnpm --filter @react-native-vector-icons/directory test --watchAll=false — 2 tests passed
• pnpm run lint:biome — 280 files checked
• pre-commit knip — no issues
• TSC_COMPILE_ON_ERROR=true pnpm --filter @react-native-vector-icons/directory build — production bundle built; the existing TS2882 warnings for CSS side-effect imports remain
• browser verification — keyboard-accessible button, copied feedback/reset, and clean console