manager: fixed webui memory leaks

[YumeYuka]

#2731

[Copilot]

Pull Request Overview

This PR fixes memory leaks in the WebUI component by properly cleaning up WebView resources and improving resource management. The changes focus on preventing memory leaks that can occur when WebView instances are not properly destroyed.

• Replaced loadUrl() with evaluateJavascript() for better performance and security
• Improved WebView cleanup in onDestroy() with proper resource disposal
• Enhanced string building using buildString for better memory efficiency

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
WebViewInterface.kt	Improved string building and replaced deprecated loadUrl() calls with evaluateJavascript()
WebUIActivity.kt	Added proper WebView cleanup in onDestroy() and improved resource management

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[Copilot]

Invalid string template syntax. The $$ prefix is not valid Kotlin syntax. This should use regular string interpolation with $ or raw strings.

Suggested change

	$$"(function() { try { $${callbackFunc}.emit('exit', $${result.code}); } catch(e) { console.error(`emitExit error: ${e}`); } })();"
	"""(function() { try { ${callbackFunc}.emit('exit', ${result.code}); } catch(e) { console.error(`emitExit error: ${'$'}{e}`); } })();"""

[Copilot]

[nitpick] The .let { return } pattern is unclear and could be confusing. Consider using explicit null checks with early returns for better readability: if (moduleId == null) { finishAndRemoveTask(); return }

Suggested change

	val moduleId = intent.getStringExtra("id") ?: finishAndRemoveTask().let { return }
	val name = intent.getStringExtra("name") ?: finishAndRemoveTask().let { return }
	val moduleId = intent.getStringExtra("id")
	if (moduleId == null) {
	finishAndRemoveTask()
	return
	}
	val name = intent.getStringExtra("name")
	if (name == null) {
	finishAndRemoveTask()
	return
	}

[Copilot]

Using null as WebView? is redundant. Simply use private var webView: WebView? = null for cleaner code.

Suggested change

	private var webView = null as WebView?
	private var webView: WebView? = null