1. searchable-select.js: mouseover was calling renderList() which replaced
   innerHTML and destroyed the click target DOM node, making options unclickable.
   Now mouseover only toggles inline styles without re-rendering.

2. ProgramController: auto-creates a default group (code-G1) when a new program
   is created, using the first available coach for that discipline.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>