[phatloi0010]

Summary

Fulfills M3-02 and M3-21 hardening requirements by adding a comprehensive Vitest unit test suite in lib/wallet/__tests__/wallet-errors.test.ts covering wallet disconnection, user modal/transaction rejection, extension locked states, and fee/insufficient XLM errors.

Closes #78

Changes

1. lib/wallet/__tests__/wallet-errors.test.ts:
   • Added 20 unit tests simulating Stellar Wallets Kit and browser extension error states.
   • Tested environment validation ensuring createStellarWalletsKitAdapter rejects immediately when called in SSR / non-browser environments.
   • Tested wallet disconnection: getAddress() safely returning null when the extension throws or returns an empty address, and clean delegation to k.disconnect().
   • Simulated modal connection rejection (User closed modal, USER_DECLINED) and verified user-facing recovery guidance.
   • Simulated transaction signing rejection across Freighter, Lobstr (Transaction was declined by user), and xBull (code: -4).
   • Simulated wallet extension locked states during both connect and transaction signing.
   • Simulated fee and reserve failures (tx_insufficient_fee, op_underfunded).
   • Verified SDK walletSigner bridge correctly propagates wallet signing failures.
   • Verified that all error messages displayed to users come from externalized strings in messages/en.json (pages.send.errorTx, pages.payee.connectError, pages.claim.errorTx, pages.lock.errorTx), upholding non-custodial honesty (hard rule 7).
2. ROADMAP.md:
   • Refreshed Last updated header and added new Changelog entry for test/wallet-errors-78.

Verification

• pnpm lint: PASS (Biome clean, 93 files checked)
• pnpm typecheck: PASS (tsc --noEmit clean, 0 errors)
• pnpm test: PASS (17 test files, 207 tests passing)
• pnpm build: PASS (Turbopack production build successful)