Update blob_wallpaper script to use ~/wallpapers directory

scripts/blob_wallpaper.sh

@@ -1,13 +1,25 @@
 #!/bin/bash
+
+WALLPAPER_DIR="$HOME/wallpapers"
+
+# Create the directory if it doesn't exist
+mkdir -p "$WALLPAPER_DIR"
+
 if [ -z "$1" ]; then
-    echo "Usage: blob_wallpaper <path-to-image>"
+    echo "Usage: blob_wallpaper <filename-or-path>"
+    echo "Available wallpapers in $WALLPAPER_DIR:"
+    ls -1 "$WALLPAPER_DIR" 2>/dev/null || echo "No wallpapers found."
     exit 1
 fi
 
-IMAGE_PATH=$(realpath "$1")
-
-if [ ! -f "$IMAGE_PATH" ]; then
-    echo "Error: File '$IMAGE_PATH' does not exist."
+# Check if the argument is a file in the wallpapers directory
+if [ -f "$WALLPAPER_DIR/$1" ]; then
+    IMAGE_PATH=$(realpath "$WALLPAPER_DIR/$1")
+# Check if the argument is an absolute or relative path
+elif [ -f "$1" ]; then
+    IMAGE_PATH=$(realpath "$1")
+else
+    echo "Error: File '$1' does not exist in $WALLPAPER_DIR or as a valid path."
     exit 1
 fi