Support Tracking Custom Beamer Themes in LaTeX

Describe the Feature

The beamer package provides a mechanism for customizing presentations via 'themes'. Beamer defines five types of theme: a general theme, a color theme, a font theme, an inner theme, and an outer theme. These are enabled with the commands:

\usetheme{mwe}
\usecolortheme{mwe}
\usefonttheme{mwe}
\useinnertheme{mwe}
\useoutertheme{mwe}

The themes function like packages loaded via \usepackage except the file names are converted to beamer(|color|font|inner|outer)mwe.sty. If a user has a custom version in their project, SCons should pick these files (and their further includes) as dependencies of a document.

Required information

Link to SCons Users thread discussing your issue.
Version of SCons: 4.8.0
Version of Python: 3.12.4
Which python distribution if applicable (python.org, cygwin, anaconda, macports, brew,etc): anaconda
How you installed SCons: scons-local (and pip install scons)
What Platform are you on? (Linux/Windows and which version): macOS
How to reproduce your issue? Please include a small self contained reproducer. Likely a SConstruct should do for most issues.: A minimal working example with explanation of desired outputs is here
How you invoke scons (The command line you're using "scons --flags some_arguments"): scons

Additional context

I have a custom theme for work that I would like SCons to track for changes.

SCons / scons

Support Tracking Custom Beamer Themes in LaTeX #4620