fix(arty): work around glow ~ expansion bug in style path

glow v2.1.2 validates the style path with ~ expanded but passes the
original unexpanded string to glamour's file reader, causing ENOENT.
Fix: pass the style via --style flag so bash expands $HOME before glow
sees it. Revert glow.yml style to "auto" (unused when arty drives it).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.config/glow/glow.yml

@@ -1,5 +1,5 @@
 # style name or JSON path (default "auto")
-style: "~/.config/glow/nord.json"
+style: "auto"
 # mouse support (TUI-mode only)
 mouse: false
 # use pager to display markdown