halter / openhtf / 21232141785

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Fix multislot WebUI: ensure all clients receive child test updates

This fixes several issues with multislot test display in the web UI:

1. pub_sub.py: Handle send errors gracefully so all clients receive
   messages even if one client fails (e.g., due to event loop issues
   in child test threads)

2. station_server.py:
   - Add phase descriptor caching to persist after test completion
   - Detect new child tests when polling and re-poll to include them
   - Fix race condition by updating _last_update_message before publish()
   - Track 'update' messages separately from 'record' messages for
     new subscriber initial state

3. station.service.ts: Don't overwrite stored child tests with empty
   array when 'record' messages arrive

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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