[FEATURE]: UI should indicate when streaming connection is lost/interrupted

[good-idea]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

When the WiFi connection has packet loss (even temporarily), streaming HTTP connections to the LLM provider stall silently. The UI shows no indication that anything is wrong and the agent chat hangs indefinitely with no error, timeout message, or retry prompt.

Using mtr I confirmed 60–80% packet loss between my machine and router during these hang events. The underlying network issue is on my end, but the OpenCode UI gives no feedback that the stream has stalled.

Expected behavior:

Display a message like "Connection interrupted" when the stream stalls for more than N seconds
Or surface a timeout error with an option to retry rather than hanging silently

The ideal fix would be to better handle streaming loss (see #8002) , but I think the best first step would just be detecting the loss and displaying a message. Currently, the "thinking" indicator keeps bouncing back and forth so I don't know if the provider is just taking its sweet time or if the connection dropped.

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Update: the bot identified a few other issues that are related but asking for more thorough fixes, this request is just for a minor UI update in the meantime

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• OpenCode hangs/freezes mid-stream on Starlink satellite internet connection #8002: OpenCode hangs/freezes mid-stream on Starlink satellite internet connection — same root cause (packet loss causing stream to stall silently with no UI feedback or timeout)
• Explore subagent hangs indefinitely with Anthropic Claude Opus 4.6 -- no timeout or recovery #13841: Explore subagent hangs indefinitely with Anthropic Claude Opus 4.6 -- no timeout or recovery — similar symptom of indefinite hang with no error or retry prompt
• Infinite retry loop when StreamIdleTimeoutError occurs during tool input generation #12234: Infinite retry loop when StreamIdleTimeoutError occurs during tool input generation — related stream timeout handling

Your issue specifically focuses on the UI feedback aspect (showing a "Connection interrupted" message), which is a distinct angle worth keeping if the above issues don't cover it.