fix: improve respawn action log visibility and retention

- Loosen filter to show AI check verdicts, detection confirmations
- Increase history from 20 to 50 entries
- Increase display height from 100px to 150px
- Fix subagents panel toggle icon (down when open)
- Increase subagents panel height when expanded

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

src/web/public/styles.css

@@ -521,7 +521,7 @@ body {
 
 .respawn-action-log {
   flex: 1;
-  max-height: 100px;
+  max-height: 150px;
   overflow-y: auto;
   font-size: 0.7rem;
   opacity: 0.9;