fix(desktop): guard WebView getWebContentsId against detached DOM

[MocA-Love]

Summary

• WebViewのdom-readyイベントがDOM切り離し後に発火した場合にgetWebContentsId()がクラッシュする問題を修正
• wv.isConnectedチェックとtry-catchガードを追加

Sentry Issue

• Fixes ELECTRON-19: "The WebView must be attached to the DOM and the dom-ready event emitted before this method can be called"
• 発生条件: persistent webviewがコンテナ間を移動中にdom-readyが発火(isTrusted: falseの合成イベント)

調査結果

Sentry全66件のissueを調査した結果:

• 修正済み: 31件 (Sentry resolved + コードベースで修正確認)
• Upstream側バグ: ELECTRON-1R/1S, 1P/1N, 1Z, 21, 1Q等 → スキップ
• 外的要因: ネイティブクラッシュ7件, react-dndバグ, ネットワークエラー等
• フォーク固有バグ: ELECTRON-19 (本PR)
• ELECTRON-H: 調査の結果worktree内のgit switch挙動の問題でupstream側 → スキップ

Test plan

• WebViewを含むBrowserPaneを開き、タブを素早く切り替えてクラッシュしないことを確認
• ブラウザペインのURL読み込み中にワークスペースを切り替えてもクラッシュしないことを確認

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: c8157cfc-40f5-4b71-a13d-246f64134f41

📥 Commits

Reviewing files that changed from the base of the PR and between dcb96d6 and 1f23f93.

📒 Files selected for processing (1)

• apps/desktop/src/renderer/screens/main/components/WorkspaceView/ContentView/TabsContent/TabView/BrowserPane/hooks/usePersistentWebview/usePersistentWebview.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/sentry-fork-issues

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[chatgpt-codex-connector]

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