browser: treat wait timeout as normal completion, not an error

src/browser/Runner.zig

@@ -93,7 +93,7 @@ fn _wait(self: *Runner, comptime is_cdp: bool, opts: WaitOpts) !CDPWaitResult {
 
         const ms_elapsed: u32 = @intCast(timer.read() / std.time.ns_per_ms);
         if (ms_elapsed >= opts.ms) {
-            return error.Timeout;
+            return .done;
         }
         if (next_ms > 0) {
             std.Thread.sleep(std.time.ns_per_ms * next_ms);

src/mcp/tools.zig

@@ -699,7 +699,7 @@ fn performGoto(server: *Server, url: [:0]const u8, id: std.json.Value, timeout:
         .ms = timeout orelse 10000,
         .until = waitUntil orelse .done,
     }) catch {
-        try server.sendError(id, .InternalError, "Timeout waiting for page load");
+        try server.sendError(id, .InternalError, "Error waiting for page load");
         return error.NavigationFailed;
     };
 }