feat: add transaction preview before signing

[Drincann]

PR Type

Enhancement, Tests

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Description

• Add transaction preview before signing

• Require confirmation unless --yes provided

• Show network, change, and UTXOs

• Update E2E signing expectations

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Diagram Walkthrough

flowchart LR
  A["tx sign command"] 
  B["Resolve sender and receiver"]
  C["Display transaction preview"]
  D["Prompt for confirmation"]
  E["Create and sign transaction"]
  F["Print signed transaction"]

  A -- "inputs" --> B
  B -- "details" --> C
  C -- "unless --yes" --> D
  D -- "confirmed" --> E
  C -- "--yes" --> E
  E -- "hex output" --> F

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File Walkthrough

	Relevant files
Enhancement	sign.mts Preview and confirm transactions before signing                    src/cli/commands/tx/sign.mts Adds --yes to skip preview confirmation. Displays a transaction preview with network, sender path, recipient, amounts, change, and UTXOs. Prompts users to confirm signing via prompts. Tracks resolved sender metadata separately from BtcAddress. +68/-7
Tests	wallet-lifecycle.test.ts Cover transaction preview in signing tests                              tests/e2e/wallet-lifecycle.test.ts Passes --yes in signing E2E flows. Verifies transaction preview output appears. Checks expected change output for regtest signing. +7/-2

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🧪 PR contains tests

🔒 No security concerns identified

⚡ No major issues detected

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