fix(wallets): handle deep link connection timeout in LobstrAdapter (#770)

[therealbibson]

Overview

Adds configurable connection timeout handling to LobstrAdapter so pending promises do not hang indefinitely when deep links or extension connection requests are ignored or unresponsive, rejecting with WalletConnectionTimeoutError and ensuring timer cleanup.

Related Issue

Closes #770

Changes

Wallet Adapters

• [MODIFY] src/wallets/adapters/LobstrAdapter.ts
  • Added LobstrAdapterOptions supporting configurable connectionTimeoutMs (default 60000)
  • Handled connection timeout using Promise.race and setTimeout/clearTimeout
  • Cleans up listeners on disconnect and timeout
• [MODIFY] src/errors.ts
  • Defined WalletConnectionTimeoutError and isWalletConnectionTimeoutError type guard
• [MODIFY] src/index.ts
  • Exported WalletConnectionTimeoutError, isWalletConnectionTimeoutError, LobstrAdapter, and LobstrAdapterOptions
• [MODIFY] test/walletSessionManager.test.ts
  • Added unit tests verifying default and custom timeout configuration, timeout rejections with WalletConnectionTimeoutError, timer cleanup on success/rejection, and disconnect() cleanup
• [MODIFY] test/sdkExports.test.ts
  • Added assertions verifying public exports for LobstrAdapter and WalletConnectionTimeoutError

Verification Results

 RUN  v1.6.1 /Users/user/Documents/Projects/open_source/split-sdk

 ✓ test/walletSessionManager.test.ts  (26 tests) 11ms
 ✓ test/sdkExports.test.ts  (3 tests) 2ms

 Test Files  2 passed (2)
      Tests  29 passed (29)

Acceptance Criteria	Status
The adapter waits at most connectionTimeoutMs (default 60 000, configurable) for a deep link response	✅ Default connectionTimeoutMs (60,000ms) with custom configuration supported
After the timeout, the pending promise rejects with a WalletConnectionTimeoutError	✅ Pending connection rejects with typed WalletConnectionTimeoutError
The deep link listener is cleaned up on timeout	✅ Timer and event listeners cleaned up appropriately
Unit tests pass	✅ All 29 unit tests pass

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