Fonts with spaces (e.g., "Noto Emoji", "DejaVu Sans") were failing
auto-installation because fontSearchTerm() generated search patterns
that didn't match font files. Font files use concatenated names without
spaces (NotoEmoji-Regular.ttf, DejaVuSans-Bold.ttf).

Replace spaces with \s* regex pattern to match files with or without spaces.

Closes #13726

Fix font package detection for fonts with spaces in names

Resolves an issue where fonts packages containing spaces in their names
(e.g., "Noto Sans") were not properly detected in Quarto projects.
Updated font path handling to correctly quote and process font names
with whitespace characters.