fix(tui): prevent hanging on certain errors (#4506)

[HRronaldo]

Summary

• Fix Issue bug: opencode run hangs when encountering certain errors instead of exiting #4506: opencode run hangs when encountering certain errors instead of exiting
• Enhanced error handling across TUI components to ensure immediate process exit
• Added proper exit codes for different error scenarios

Changes

• exit.tsx: Enhanced error handling with proper exit codes and corrected Object.assign usage
• worker.ts: Fixed event stream error handling with immediate process exit and corrected indentation
• run.ts: Improved CLI command error handling with guaranteed process exit

Impact

• opencode now exits immediately on errors instead of hanging indefinitely
• Proper exit codes distinguish between success (0) and errors (1)
• More reliable behavior for automation and CI environments

Fixes #4506

[github-actions]

Hey! Your PR title Fix/run hangs on errors doesn't follow conventional commit format.

Please update it to start with one of:

• feat: or feat(scope): new feature
• fix: or fix(scope): bug fix
• docs: or docs(scope): documentation changes
• chore: or chore(scope): maintenance tasks
• refactor: or refactor(scope): code refactoring
• test: or test(scope): adding or updating tests

Where scope is the package name (e.g., app, desktop, opencode).

See CONTRIBUTING.md for details.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

No duplicate PRs found

[github-actions]

Closing this pull request because it has had no updates for more than 60 days. If you plan to continue working on it, feel free to reopen or open a new PR.