crash handler, model guard, status temp/fan, timeout fix

- SIGSEGV/SIGABRT crash handler in ui/main.cc prints stack trace to stderr
- Fixed onroad crash: guard update_model() against empty model position data
  (was dereferencing end()-1 on empty list when modeld not running in bench)
- Status window: added device temperature and fan speed
- Interactive timeout returns to splash/onroad (not ClearPilotPanel)
- bench_cmd dump detects crash loops via UI process uptime check
- bench_cmd wait_ready timeout increased to 20s
- Restored camerad to bench ignore list (not needed for UI testing)
- Updated CLAUDE.md with crash debugging procedures

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

selfdrive/ui/qt/window.h

@@ -29,6 +29,8 @@ private:
   QLabel *storage_label;
   QLabel *ram_label;
   QLabel *load_label;
+  QLabel *temp_label;
+  QLabel *fan_label;
   QLabel *ip_label;
   QLabel *wifi_label;
   QLabel *vpn_label;