session logging, build-only mode, park splash, boot logo spinner

- Per-process stderr logging to /data/log2/{session}/ with time-safe
  directory naming (boot-xxx renamed once GPS/NTP sets clock)
- Aggregate session.log with major events (start/stop, transitions)
- 30-day log rotation cleanup on manager startup
- build_only.sh: compile without starting manager, non-blocking error
  display, kills stale processes
- build.py: copies updated spinner binary after successful build
- Onroad park mode: show splash screen when car is on but in park,
  switch to camera view when shifted to drive, honor screen on/off
- Spinner: full-screen boot logo background from /usr/comma/bg.jpg
  with white progress bar overlay
- Boot logo: auto-regenerate when boot_logo.png changes, 140% scale
- launch_openpilot.sh: cd to /data/openpilot for reliable execution
- launch_chffrplus.sh: kill stale text error displays on startup
- spinner shell wrapper: prefer freshly built _spinner over prebuilt

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

selfdrive/manager/build.py

@@ -1,5 +1,6 @@
 #!/usr/bin/env python3
 import os
+import sys
 import subprocess
 from pathlib import Path
 
@@ -54,6 +55,14 @@ def build(spinner: Spinner, dirty: bool = False, minimal: bool = False) -> None:
 
     if scons.returncode == 0:
       Path('/data/openpilot/prebuilt').touch()
+
+      # CLEARPILOT: update prebuilt spinner if the new build is newer
+      new_spinner = Path(BASEDIR) / "selfdrive/ui/_spinner"
+      old_spinner = Path(BASEDIR) / "selfdrive/ui/qt/spinner"
+      if new_spinner.exists() and (not old_spinner.exists() or new_spinner.stat().st_mtime > old_spinner.stat().st_mtime):
+        import shutil
+        shutil.copy2(str(new_spinner), str(old_spinner))
+
       break
 
   if scons.returncode != 0:
@@ -69,8 +78,13 @@ def build(spinner: Spinner, dirty: bool = False, minimal: bool = False) -> None:
     # Show TextWindow
     spinner.close()
     if not os.getenv("CI"):
-      with TextWindow("openpilot failed to build\n \n" + error_s) as t:
+      # CLEARPILOT: BUILD_ONLY mode shows error on screen but doesn't block
+      t = TextWindow("openpilot failed to build\n \n" + error_s)
+      if os.getenv("BUILD_ONLY"):
+        print(error_s, file=sys.stderr)
+      else:
         t.wait_for_exit()
+        t.close()
     exit(1)
 
   # enforce max cache size