fix(build): fix Python interpreter calling failure when path contains spaces (#18210)

Link to issue number:

None
Summary of the issue:

On systems where the build directory contains spaces (e.g., under "My Codes"), NVDA's build process fails due to unquoted executable paths. Previously, this was addressed for m4.exe (see #18147) but Python interpreter paths used during SCons builds (such as for building user_docs) were not properly quoted, causing continued failures in similar scenarios.
Description of user facing changes:

None
Description of developer facing changes:

The build system SCons invokes the Python interpreter (e.g., @{sys.executable} in building scripts) in several build steps. When the interpreter’s path contains spaces (e.g., in "C:\Users\MyName\Documents\My Codes\nvda\.venv\Scripts\python.exe"), the command fails unless the path is wrapped in quotes. This PR wraps {sys.executable} in double quotes to ensure these paths are parsed correctly by the shell and avoids build errors in such environments.

Author: CrazySteve0605

projectDocs/dev/developerGuide/sconscript

@@ -24,7 +24,7 @@ mdFileSub = env.Substfile(
 htmlFile = env.Command(
 	target=mdFile.abspath.replace(".md", ".html"),
 	source=mdFileSub,
-	action=[f'@{sys.executable} source/md2html.py -t developerGuide "$SOURCE" "$TARGET"'],
+	action=[f'@"{sys.executable}" source/md2html.py -t developerGuide "$SOURCE" "$TARGET"'],
 )
 devGuide = env.Command(
 	target=devDocsOutputDir.File("developerGuide.html"), source=htmlFile, action=Move("$TARGET", "$SOURCE")

sconstruct

@@ -307,7 +307,7 @@ for xliffFile in env.Glob(os.path.join(userDocsDir.path, "*", "*.xliff")):
 	env.Command(
 		mdFile,
 		xliffFile,
-		[f'@{sys.executable} source/markdownTranslate.py generateMarkdown -x "{xliffFile}" -o "{mdFile}"'],
+		[f'@"{sys.executable}" source/markdownTranslate.py generateMarkdown -x "{xliffFile}" -o "{mdFile}"'],
 	)
 # Allow all markdown files to be converted to html in user_docs
 for mdFile in env.Glob(os.path.join(userDocsDir.path, "*", "*.md")):
@@ -326,7 +326,7 @@ for mdFile in env.Glob(os.path.join(userDocsDir.path, "*", "*.md")):
 	htmlFile = env.Command(
 		target=mdFile.abspath.replace(".md", ".html"),
 		source=mdFileSub,
-		action=[f'@{sys.executable} source/md2html.py -l {lang} -t {docType} "$SOURCE" "$TARGET"'],
+		action=[f'@"{sys.executable}" source/md2html.py -l {lang} -t {docType} "$SOURCE" "$TARGET"'],
 	)
 	styleInstallPath = os.path.dirname(mdFile.abspath)
 	installedStyle = env.Install(styleInstallPath, styles)
@@ -351,7 +351,7 @@ for userGuideFileSub in env.Glob(os.path.join(userDocsDir.path, "*", "userGuide.
 	keyCommandsHtmlFile = env.Command(
 		target=userGuideFileSub.abspath.replace("userGuide.md.sub", "keyCommands.html"),
 		source=userGuideFileSub,
-		action=[f'@{sys.executable} source/md2html.py -l {lang} -t keyCommands "$SOURCE" "$TARGET"'],
+		action=[f'@"{sys.executable}" source/md2html.py -l {lang} -t keyCommands "$SOURCE" "$TARGET"'],
 	)
 	env.Depends(keyCommandsHtmlFile, userGuideFileSub)