feat(browser): prefer Chrome default + add Brave/Edge fallbacks

Co-authored-by: Christoph Nakazawa <christoph.pojer@gmail.com>

src/config/types.browser.ts

@@ -23,7 +23,7 @@ export type BrowserConfig = {
   cdpUrl?: string;
   /** Accent color for the clawd browser profile (hex). Default: #FF4500 */
   color?: string;
-  /** Override the browser executable path (macOS/Linux). */
+  /** Override the browser executable path (all platforms). */
   executablePath?: string;
   /** Start Chrome headless (best-effort). Default: false */
   headless?: boolean;