Fix frontend build issue for Arches installed with pipenv, poetry or uv

Resolves archesproject#11764

The convention of naming a virtual environment "`.venv`" appears to have been adopted
by the above package managers.

The fix addresses the issue of templates in directories that contain a dot (specifically
for Arches installed with the above package managers) while ensuring that dotfiles, such
as macOS' .DS_Store (archesproject#11094), are ignored.

Author: danbentley

webpack/webpack-utils/build-filepath-lookup.js

@@ -28,7 +28,7 @@ function buildFilepathLookup(path, staticUrlPrefix) {
 
     return getFileList(path).reduce((lookup, file) => {
         // Ignore dotfiles
-        if (file.match(new RegExp(Path.sep + '\\.')) || file.match(/^\./)) {
+        if (Path.basename(file).startsWith('.')) {
             return lookup;
         }
         const extension = file.match(/[^.]+$/).toString();