screenshot: fix action separator and add Pictures dir guard

scripts/screenshot.sh

@@ -2,6 +2,8 @@
 
 FILE="$HOME/Pictures/screenshot-$(date +%s).png"
 
+mkdir -p "$HOME/Pictures"
+
 # Exit silently if the user cancels region selection
 if ! grim -g "$(slurp)" "$FILE"; then
     exit 0
@@ -13,7 +15,7 @@ action=$(notify-send "Screenshot captured" \
     "Saved · Copied to clipboard" \
     --hint="string:image-path:$FILE" \
     --expire-time=10000 \
-    --action="actions=Actions")
+    --action="actions:Actions")
 
 [[ "$action" != "actions" ]] && exit 0