fix(tui): recover event stream after lock/sleep disconnect

[Niraj12chaudhary]

Issue for this PR

Closes #15431

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Fixes a TUI freeze case after long macOS lock/sleep periods where sessions could remain stuck in In Progress with no new output.

Changes in this PR:

• Added reconnect handling + heartbeat timeout in the TUI SDK SSE consumer.
• Added reconnect handling + heartbeat timeout in the TUI worker event relay.
• Triggered a sync bootstrap on server.connected / global.disposed so session status is refreshed after reconnect.

Why this works:

• If the event stream silently stalls/drops during lock/sleep, the new heartbeat timeout aborts the stale stream and forces reconnect.
• On reconnect, sync bootstrap refreshes session state from server APIs, so stale local busy status is corrected and output/state continue updating.

How did you verify your code works?

• Ran package typecheck locally:
  • bun --cwd packages/opencode typecheck
• Manually validated code paths for:
  • stream reconnection loop
  • heartbeat-triggered abort
  • post-reconnect sync refresh

Screenshots / recordings

N/A (TUI event-stream reliability fix)

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

Thanks for your contribution!

This PR doesn't have a linked issue. All PRs must reference an existing issue.

Please:

1. Open an issue describing the bug/feature (if one doesn't exist)
2. Add Fixes #<number> or Closes #<number> to this PR description

See CONTRIBUTING.md for details.

[github-actions]

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

Potentially Related PRs Found

Based on my search, I found several PRs that are related to event stream handling and TUI reliability:

1. fix(tui): resolve streaming freeze from unhandled finish event, missing timeouts, and unguarded effects #15308 - fix(tui): resolve streaming freeze from unhandled finish event, missing timeouts, and unguarded effects

   • Directly related: Also addresses streaming freeze issues in TUI with timeout handling

2. refactor(opencode): replace reconcile() with path-syntax setStore and delta coalescing for streaming updates #15309 - refactor(opencode): replace reconcile() with path-syntax setStore and delta coalescing for streaming updates

   • Related: Handles streaming update reliability

3. fix(opencode): coalesce stream updates and add reconnect backoff #13026 - fix(opencode): coalesce stream updates and add reconnect backoff

   • Related: Addresses reconnect backoff for streams

4. fix: consolidate memory leak fixes from #14650 and #8953 #15435 - fix: consolidate memory leak fixes from #14650 and #8953

   • Potentially related: Recent consolidation of reliability fixes

Most relevant: PR #15308 appears to be closely related as it also fixes streaming freeze issues in the TUI with timeout handling, which overlaps with this PR's heartbeat timeout approach.

[github-actions]

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