Fix Windows cookie crash after composewebview alpha-13 bump

[Copilot]

composewebview 1.0.0-alpha-13 removed WebViewState.nativeWebView. The initial fix used state.cookieManager.getCookies(), but WryCookieManager dispatches to Dispatchers.IO, which crashes on Windows because WebView2 requires cookie access on the main thread.

Changes

• WebViewLoginScreen.kt: Replace state.cookieManager calls with direct WryWebViewPanel access via state.webView?.nativeWebView as? WryWebViewPanel, calling the non-suspend getCookiesForUrl() and clearAllCookies() on the main thread.

// before (crashes on Windows — Dispatchers.IO)
state.cookieManager.removeAllCookies()
val cookies = state.cookieManager.getCookies(actualUrl)

// after (runs on main thread, safe for WebView2)
(state.webView?.nativeWebView as? WryWebViewPanel)?.clearAllCookies()
val cookies = (state.webView?.nativeWebView as? WryWebViewPanel)
    ?.getCookiesForUrl(actualUrl)
    .orEmpty()

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