sessions.js executes before chat.js in ES module order, so
window.chatModule is not yet set when _checkServerStream runs on page
load. The resumeStream guard evaluates false and the spinner fallback
kicks in; that fallback only polls stream_status and never retries the
live-resume path, leaving the user with a dead spinner for the entire
duration of the detached agent run.
Fix: add a one-shot retry in the polling loop. On the first tick where
window.chatModule.resumeStream is available, attempt to attach. If it
succeeds, clear the interval and remove the spinner — live SSE streaming
takes over. If the run has already finished (404), the loop continues to
poll status and calls selectSession on completion.
Fixes#3048
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
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