[Code scan] Copy dark_rtd.css when it is registered with sphinx_rtd_theme

[njzjz]

This issue is a result of a Codex global code scan of deepmodeling/deepmodeling_sphinx at commit 156679f.

Problem

When enable_deepmodeling = False and html_theme = "sphinx_rtd_theme", the extension still registers dark_rtd.css, but copy_custom_files() returns before copying package assets. The generated HTML can reference _static/dark_rtd.css even though the file is absent.

Code references:

deepmodeling_sphinx/deepmodeling_sphinx/inject.py

Lines 38 to 51 in 156679f

	def copy_custom_files(app):
	if not app.config.enable_deepmodeling:
	return
	if app.builder.format == "html":
	staticdir = os.path.join(app.builder.outdir, "_static")
	cwd = Path(__file__).parent.absolute()
	banner_css = cwd / "banner.css"
	banner_js = cwd / "banner.js"
	dark_css = cwd / "dark_rtd.css"
	os.makedirs(staticdir, exist_ok=True)
	staticdir = os.path.join(app.builder.outdir, "_static")
	copy_asset_file(str(banner_css), staticdir)
	copy_asset_file(str(banner_js), staticdir)
	copy_asset_file(str(dark_css), staticdir)

deepmodeling_sphinx/deepmodeling_sphinx/inject.py

Lines 174 to 177 in 156679f

	def enable_dark_mode(app, config):
	"""Enable dark mode if the theme is sphinx_rtd_theme."""
	if config.html_theme == "sphinx_rtd_theme":
	app.add_css_file("dark_rtd.css")

Reproduction

Use a minimal Sphinx project with:

extensions = ["deepmodeling_sphinx"]
html_theme = "sphinx_rtd_theme"
enable_deepmodeling = False

The generated page includes _static/dark_rtd.css, but _static/dark_rtd.css is not copied to the output directory.

Impact

Projects that disable DeepModeling-specific banner styling can still emit a broken stylesheet reference when using the RTD theme.

Suggested fix

Either skip app.add_css_file("dark_rtd.css") when enable_deepmodeling is false, or copy dark_rtd.css independently from the banner assets.