fix(help): clarify --swatch applies to terminal and notifications

The --swatch flag now controls both the inline terminal color block and
the desktop notification icon (via ImageMagick). Update the help text
to reflect this so users know the flag affects both output contexts.

color-tool

@@ -305,7 +305,7 @@ show_help() {
   printf "  ${bold}${cyan}--output${reset} ${dim}FMT${reset}    Format(s) to output: ${cyan}hex, rgb, hsl, rgba, hsla, hexa, all${reset} ${dim}(comma-separated)${reset}\n"
   printf "  ${bold}${cyan}--[no-]json${reset}    Output as a JSON table of selected formats\n"
   printf "  ${bold}${cyan}--[no-]name${reset}    Fetch nearest color name from thecolorapi.com ${dim}(requires curl, jq)${reset}\n"
-  printf "  ${bold}${cyan}--[no-]swatch${reset}  Include a color swatch in the terminal output\n"
+  printf "  ${bold}${cyan}--[no-]swatch${reset}  Include a color swatch in the terminal output and desktop notification\n"
   printf "  ${bold}${cyan}--[no-]copy${reset}    Copy result to clipboard ${dim}(wl-clipboard preferred, xclip as fallback)${reset}\n"
   printf "  ${bold}${cyan}--[no-]notify${reset}  Show desktop notification ${dim}(on by default in --desktop)${reset}\n"
   printf "  ${bold}${cyan}--desktop${reset}      GUI mode: pick → copy → notify ${dim}(for app menu / .desktop launcher)${reset}\n"