refactor error handling and guidance

autoThumbs.bat

@@ -72,7 +72,13 @@ if not exist "%~dp0nascleanup.sh" (
 )
 ssh Hydra "cat > ~/nascleanup.sh" < "%~dp0nascleanup.sh"
 ssh Hydra "bash -lc 'if command -v dos2unix >/dev/null 2>&1; then dos2unix -f ~/nascleanup.sh; else tr -d \"\r\" < ~/nascleanup.sh > ~/nascleanup.sh.tmp && mv ~/nascleanup.sh.tmp ~/nascleanup.sh; fi; chmod +x ~/nascleanup.sh; ~/nascleanup.sh \"%NASPATH%\"'"
-call :WIN_REMOVE_LOCAL_EADIR_TMP
+if errorlevel 1 (
+    echo ERROR: nascleanup failed on NAS - check promote ^(eaDir_tmp -^> @eaDir^) messages above.
+    echo Keeping eaDir_tmp on the share so you can retry without re-running FFmpeg.
+    call :PRINT_HYDRA_CLEAR_EADIR
+) else (
+    call :WIN_REMOVE_LOCAL_EADIR_TMP
+)
 goto END
 
 :BOTH
@@ -117,7 +123,13 @@ if not exist "%~dp0nascleanup.sh" (
 )
 ssh Hydra "cat > ~/nascleanup.sh" < "%~dp0nascleanup.sh"
 ssh Hydra "bash -lc 'if command -v dos2unix >/dev/null 2>&1; then dos2unix -f ~/nascleanup.sh; else tr -d \"\r\" < ~/nascleanup.sh > ~/nascleanup.sh.tmp && mv ~/nascleanup.sh.tmp ~/nascleanup.sh; fi; chmod +x ~/nascleanup.sh; ~/nascleanup.sh \"%NASPATH%\"'"
-call :WIN_REMOVE_LOCAL_EADIR_TMP
+if errorlevel 1 (
+    echo ERROR: nascleanup failed on NAS - check promote ^(eaDir_tmp -^> @eaDir^) messages above.
+    echo Keeping eaDir_tmp on the share so you can retry without re-running FFmpeg.
+    call :PRINT_HYDRA_CLEAR_EADIR
+) else (
+    call :WIN_REMOVE_LOCAL_EADIR_TMP
+)
 goto END
 
 :FIX_ONEDRIVE
@@ -163,6 +175,13 @@ echo 3. Your custom thumbnails should now have priority!
 echo.
 goto END
 
+REM Print ssh Hydra command to wipe @eaDir when NAS cleanup failed (matches NASPATH from pasted R:\ path).
+:PRINT_HYDRA_CLEAR_EADIR
+if "%NASPATH%"=="" goto :eof
+echo To clear locked @eaDir on Hydra: ssh in first, then run:
+echo   sudo rm -rf "%NASPATH%/@eaDir"
+goto :eof
+
 REM Remove folder-level @eaDir on the pasted Windows path (same files as NAS over SMB).
 :WIN_REMOVE_LOCAL_EADIR
 if "%WINPATH%"=="" goto :eof