upstream merge 2026-04-27 PR-D2: terminal connection diagnostics

[MocA-Love]

Summary

upstream 2026-04-27 後半バッチ第2弾。PR-D2: terminal connection diagnostics (1 commit)。

依存: #448 (PR-D1) の上に乗っている。PR-D1 を先にマージしてください。

取り込み

SHA	upstream	概要
ce402ca6f	superset-sh#3801	terminal WebSocket close / error の詳細診断メッセージを追加 (formatWsEndpoint, formatCloseDetails)

Fork 側コンフリクト解決

apps/desktop/src/renderer/lib/terminal/terminal-ws-transport.ts: fork の Sentry debug capture (terminalRendererDebug.error("ws-error", ...) with captureMessage: true, fingerprint: ["terminal.renderer", "ws-error"]) を維持しつつ、upstream の詳細 terminal.writeln("WebSocket error while connecting to ${formatWsEndpoint(transport.currentUrl)}. Check host-service or relay connectivity.") を併用。FORK NOTE コメントで意図を残す。

Test plan

• bun install 整合性 OK
• bun run typecheck 全 28 task green
• bun run lint biome green
• (手動) terminal 接続失敗時のエラー表示確認 (詳細メッセージ + Sentry capture 両方)

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