Update success message to use full file path

Replaced `filename` with `filepath` in the success message to display the full file path of the saved screenshot. This provides more clarity to users on where the screenshot is stored.

Author: mikler

src/tools/interactions/screenshot.ts

@@ -70,7 +70,7 @@ export async function executeScreenshot(
       content: [
         {
           type: 'text',
-          text: `Screenshot saved successfully to: ${filename}`,
+          text: `Screenshot saved successfully to: ${filepath}`,
         },
       ],
     };