reset to pre-modification baseline; restart feature work from clean state

Restoring the working tree to the pristine pre-Claude baseline previously
preserved at /data/clearpilot (now /data/clearpilot-baseline). The prior
modified-but-broken tree is snapshotted at /data/openpilot-broken-2026-05-03
and tagged here as pre-reset-2026-05-03 for reference.

From here, features (UI changes, dashcam, telemetry, GPS, display modes,
speed logic, standstill power saving, etc.) will be re-introduced one at
a time with proper testing.

selfdrive/ui/spinner

@@ -1,10 +1,5 @@
 #!/bin/sh
 
-# CLEARPILOT: prefer freshly built _spinner over prebuilt qt/spinner
-if [ -f ./_spinner ]; then
-  exec ./_spinner "$1"
-fi
-
 if [ -f /TICI ] && [ ! -f qt/spinner ]; then
   cp qt/spinner_larch64 qt/spinner
 fi