Update lattice.ts

[AfuroIsCrazy]

Note

Refactors the offscreen Lattice flow to open the connector tab, validate/parse credentials, detect tab closure, and consistently return results/errors with cleanup.

• Offscreen Lattice flow (app/offscreen/lattice.ts):
  • Tab Opening: Introduces openConnectorTab(url: string): Promise<Window> with improved error messaging.
  • Message Listener: Reworks init() to filter by OffscreenCommunicationTarget.latticeOffscreen, open the tab, and orchestrate response forwarding.
    • Validates postMessage origin/source/data against KnownOrigins.lattice and the opened tab.
    • Parses credentials JSON and enforces required fields (deviceID, password).
    • Detects user-closing of the connector via interval and returns an error.
    • Centralized cleanup (interval + event listener) and error serialization before sendResponse.
  • Types/Docs: Adds TypeScript typings and JSDoc annotations throughout.

^{Written by Cursor Bugbot for commit ddcb627. This will update automatically on new commits. Configure here.}

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[cursor]

Bug: Missing return true breaks async sendResponse in Chrome

The Chrome extension message listener is missing return true; after the promise chain. When using sendResponse asynchronously (inside .then() or .catch() callbacks), the listener must return true synchronously to keep the message channel open. Without it, Chrome closes the channel immediately after the listener returns undefined, causing all sendResponse calls to silently fail. Other offscreen handlers in this codebase (like ledger.ts and trezor.ts) correctly include return true; with explanatory comments referencing the Chrome API docs. Additionally, the file appears to be truncated mid-catch block, leaving the code syntactically incomplete.