Fix esptool detection and baud rate issues in Windows batch scripts (#7856)

- Fix esptool detection to use 'version' subcommand instead of no arguments
- Fix device-update.bat to use 115200 bps for flashing, 1200 bps only for reset
- Add missing closing quotes in debug messages

Replace magic numbers with named constants for better maintainability

- Add RESET_BAUD=1200 constant for reset baud rate
- Add UPDATE_OFFSET=0x10000 constant for update flash offset
- Use constants instead of hardcoded values throughout script

Extract magic numbers to constants in shell scripts for consistency

- Add FLASH_BAUD, RESET_BAUD, UPDATE_OFFSET constants to device-update.sh
- Add RESET_BAUD, FIRMWARE_OFFSET constants to device-install.sh
- Replace hardcoded values with named constants throughout
- Maintain consistency with batch script improvements

Fix Python path quoting and remove unreachable code

- Quote Python interpreter paths to handle spaces in paths like 'C:\Program Files\Python\python.exe'
- Remove unreachable GOTO statements after EXIT /B commands
- Improve robustness when custom Python interpreters are specified

Fix esptool detection for pipx installations

- Change from checking ERRORLEVEL GEQ 2 to EQU 9009
- Pipx-installed esptool returns exit code 2 when showing help (normal)
- Only treat Windows 'command not found' error (9009) as truly not found
- Add debug output to show actual exit codes for troubleshooting

bin/device-update.bat

@@ -6,6 +6,8 @@ SET "SCRIPT_NAME=%~nx0"
 SET "DEBUG=0"
 SET "PYTHON="
 SET "ESPTOOL_BAUD=115200"
+SET "RESET_BAUD=1200"
+SET "UPDATE_OFFSET=0x10000"
 SET "ESPTOOL_CMD="
 SET "LOGCOUNTER=0"
 SET "CHANGE_MODE=0"
@@ -85,14 +87,13 @@ IF "!FILENAME:update=!"=="!FILENAME!" (
 )
 
 :skip-filename
-SET "ESPTOOL_BAUD=1200"
 
 CALL :LOG_MESSAGE DEBUG "Determine the correct esptool command to use..."
 IF NOT "__%PYTHON%__"=="____" (
-    SET "ESPTOOL_CMD=!PYTHON! -m esptool"
+    SET "ESPTOOL_CMD=""!PYTHON!"" -m esptool"
     CALL :LOG_MESSAGE DEBUG "Python interpreter supplied."
 ) ELSE (
-    CALL :LOG_MESSAGE DEBUG "Python interpreter NOT supplied. Looking for esptool...
+    CALL :LOG_MESSAGE DEBUG "Python interpreter NOT supplied. Looking for esptool..."
     WHERE esptool >nul 2>&1
     IF %ERRORLEVEL% EQU 0 (
         @REM WHERE exits with code 0 if esptool is found.
@@ -105,11 +106,11 @@ IF NOT "__%PYTHON%__"=="____" (
 
 CALL :LOG_MESSAGE DEBUG "Checking esptool command !ESPTOOL_CMD!..."
 !ESPTOOL_CMD! >nul 2>&1
-IF %ERRORLEVEL% GEQ 2 (
-    @REM esptool exits with code 1 if help is displayed.
+CALL :LOG_MESSAGE DEBUG "esptool exit code: %ERRORLEVEL%"
+IF %ERRORLEVEL% EQU 9009 (
+    @REM 9009 = command not found on Windows
     CALL :LOG_MESSAGE ERROR "esptool not found: !ESPTOOL_CMD!"
     EXIT /B 1
-    GOTO eof
 )
 IF %DEBUG% EQU 1 (
     CALL :LOG_MESSAGE DEBUG "Skipping ESPTOOL_CMD steps."
@@ -127,13 +128,13 @@ CALL :LOG_MESSAGE INFO "Using esptool baud: !ESPTOOL_BAUD!."
 
 IF %CHANGE_MODE% EQU 1 (
     @REM Attempt to change mode via 1200bps Reset.
-    CALL :RUN_ESPTOOL !ESPTOOL_BAUD! --after no_reset read_flash_status
+    CALL :RUN_ESPTOOL !RESET_BAUD! --after no_reset read_flash_status
     GOTO eof
 )
 
 @REM Flashing operations.
-CALL :LOG_MESSAGE INFO "Trying to flash update "!FILENAME!" at OFFSET 0x10000..."
-CALL :RUN_ESPTOOL !ESPTOOL_BAUD! write-flash 0x10000 "!FILENAME!" || GOTO eof
+CALL :LOG_MESSAGE INFO "Trying to flash update "!FILENAME!" at OFFSET !UPDATE_OFFSET!..."
+CALL :RUN_ESPTOOL !ESPTOOL_BAUD! write-flash !UPDATE_OFFSET! "!FILENAME!" || GOTO eof
 
 CALL :LOG_MESSAGE INFO "Script complete!."