chore: allow right click (#687)

Fixes https://github.com/microsoft/playwright-mcp/issues/467

README.md

@@ -376,6 +376,7 @@ http.createServer(async (req, res) => {
     - `element` (string): Human-readable element description used to obtain permission to interact with the element
     - `ref` (string): Exact target element reference from the page snapshot
     - `doubleClick` (boolean, optional): Whether to perform a double click instead of a single click
+    - `button` (string, optional): Button to click, defaults to left
   - Read-only: **false**
 
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