Two related planning-mode issues:
1. The streaming "thinking" panel only showed for models that emit explicit
thinking_delta events (e.g. Anthropic Extended Thinking). For every other
model the user saw a spinner with no streaming content because text_delta
was being accumulated server-side without being broadcast over SSE. Now
onText also forwards deltas through the same stream channel so any model
surfaces its in-flight output.
2. Returning to the planning screen after the browser tab was backgrounded
long enough for the SSE socket to time out would land the user in a
permanent error view ("Session failed while contacting the AI") even
though the server session was still alive. The onError handler now first
re-fetches the AI session row; if the server still reports the session as
generating or awaiting_input it silently reconnects without surfacing the
transient error. Only genuine server-side failures still surface.
Tests for the obsolete manual-retry recovery path were rewritten as
auto-recovery assertions.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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