Default list width 256px (min 160, max min(480px,50%)), driven by an inline width var with flex:0 0 so the drag actually wins (the embedded wide layout previously forced a clamp via !important, so the handle did nothing). Preview pane is flex:1 1 auto;min-width:0 so freed space flows to it. Persisted per-project via kb-dashboard-github-import-list-width. Shared workspace covers both Issues and Pull Requests tabs.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>