feat: dashcamd trip lifecycle, status indicator, CLAUDE.md updates

dashcamd now waits for valid system time + GPS fix + drive gear before
starting a trip. Returns to waiting state on 10-min park timeout or
ignition off. Publishes DashcamState and per-trip DashcamFrames to
memory params. Status window shows stopped/waiting/recording states.

Updated CLAUDE.md with current display mode behavior, OmxEncoder port
details, speed limit warning thresholds, and dashcam param docs.

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

selfdrive/ui/qt/window.h

@@ -20,7 +20,7 @@ public:
   struct StatusData {
     QString time, storage, ram, load, temp, fan, ip, wifi;
     QString vpn_status, vpn_ip, gps, telemetry;
-    QString dashcam_status, dashcam_frames;
+    QString dashcam_state, dashcam_frames;
     float temp_c = 0;
   };