Resolve white screen caused by clicking graph blocks and PDF links

[TCOTC]

fix #9991 #14701

fix https://ld246.com/article/1763457508822

[Copilot]

Pull request overview

This PR fixes white screen issues that occur when clicking hyperlinks in graph blocks and PDF links within the Electron app. The solution enhances navigation control by restricting window navigation to only allowed paths based on window type, preventing unintended navigation that causes white screens.

Key changes:

• Added window type-based navigation restrictions to the windowNavigate function
• External links are now prevented from navigating within the app and are instead opened in the system browser
• Each window type (main app, new window, export window) is restricted to its specific allowed paths

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[Copilot]

The switch statement lacks a default case to handle unexpected windowType values. If an unknown windowType is passed, isAllowed will remain false and navigation will be blocked, which may cause unexpected behavior. Consider adding a default case that either logs a warning or sets a reasonable default behavior.

Suggested change

	break;
	break;
	default:
	// 未知窗口类型：保持不允许导航，但记录警告以便调试
	console.warn(
	`Unexpected window type in windowNavigate: "${windowType}" for path "${pathname}"`
	);
	break;