REF: convert fee-bump screens (CPFP, RBF) to TypeScript functional components

[NAME-ASHWANIYADAV]

Closes #125

What

Convert the three fee-bump transaction screens from JavaScript Class Components
to TypeScript Functional Components:

• screen/transactions/CPFP.js -> CPFP.tsx
• screen/transactions/RBFBumpFee.js -> RBFBumpFee.tsx
• screen/transactions/RBFCancel.js -> RBFCancel.tsx

Why

• CONTRIBUTING.md states "All new files must be in TypeScript"
• These were the last Class Components using PropTypes, this.state,
  and componentDidMount - now modernized to hooks
• Removes runtime PropTypes in favor of TypeScript static types
• Replaces legacy BlueCurrentTheme with useTheme() hook
• Replaces class contextType = StorageContext with useStorage() hook
• Replaces isElectrumDisabled access with useSettings() hook
  (consistent with other screens like Confirm.tsx, WalletsList.tsx)

How

• class extends Component -> functional components with hooks
• this.state -> useState()
• componentDidMount -> useEffect()
• PropTypes -> TypeScript types (via DetailViewStackParamList)
• BlueCurrentTheme.colors -> useTheme().colors
• Class inheritance (RBFBumpFee extends CPFP) -> standalone components

Testing

• npx tsc --noEmit - zero errors in these files
• No behavior changes - all UI and logic preserved exactly
• No new dependencies added

[NAME-ASHWANIYADAV]

@theanmolsharma @chaitika PTAL !!

[chaitika]

afaiu, the wallet doesn't plan on supporting rbf and cpfp in near future, these files are inherited code from bluewallet..
better would be to clean up these leftover files and any existing nav entries to these feature?

[NAME-ASHWANIYADAV]

@chaitika Thanks for the feedback! Updated the PR to delete these inherited BlueWallet files and clean up all navigation/state/locale references. hd-segwit-bech32-transaction.ts cleanup will be a follow-up PR

[NAME-ASHWANIYADAV]

@notTanveer @chaitika @theanmolsharma have a look !!