feat(styles): add nord theme gallery and docs

- Add nord to gallery screenshot script
- Add nord gallery screenshot
- Mention nord in upgrade guide built-in styles

Co-authored-by: DeepSeek <service@deepseek.com>

Author: SilverRainZ

UPGRADE_GUIDE_V2.md

@@ -50,7 +50,7 @@ r, _ := glamour.NewTermRenderer(glamour.WithStylePath("light"))
 // For dark backgrounds (default)
 r, _ := glamour.NewTermRenderer(glamour.WithStylePath("dark"))
 
-// Other built-in styles: "pink", "dracula", "tokyo-night", "ascii"
+// Other built-in styles: "pink", "dracula", "nord", "tokyo-night", "ascii"
 r, _ := glamour.NewTermRenderer(glamour.WithStylePath("dracula"))
 ```
 

gallery.sh

@@ -6,7 +6,7 @@ if ! command -v freeze &> /dev/null; then
     exit 1
 fi
 
-defaultStyles=("ascii" "auto" "dark" "dracula" "light" "notty" "pink")
+defaultStyles=("ascii" "auto" "dark" "dracula" "light" "nord" "notty" "pink" "tokyo-night")
 
 for style in "${defaultStyles[@]}"; do
     echo "Generating screenshot for ${style}"

styles/gallery/README.md

@@ -18,6 +18,10 @@ Pronounced _naughty_.
 
 ![Dracula Style](./dracula.png)
 
+## Nord
+
+![Nord Style](./nord.png)
+
 ## Tokyo Night
 
 ![Tokyo Night Style](./tokyo-night.png)