feat: Fetch colorschemes during extraction

lua/extractor/init.lua

@@ -15,18 +15,18 @@ end
 
 --- For each installed colorscheme, try both light and dark backgrounds, then
 --- extracts the color groups and writes them to a file.
---- @param colorschemes string[] The colorschemes to extract the color groups from.
 --- @param output_path string The path to write the extracted color groups to. Optional.
-function M.extract(colorschemes, output_path)
+function M.extract(output_path)
   print("Starting color group extraction...")
   if is_output_path_valid(output_path) then
     print("Output path: " .. output_path)
   else
     output_path = ""
   end
 
+  local colorschemes = Vim.get_colorschemes()
   if not is_colorschemes_valid(colorschemes) then
-    error("Invalid colorschemes parameter.")
+    error("No valid colorschemes.")
   end
 
   print("Colorschemes to analyze: " .. Table.to_json(colorschemes))