refactor(web): replace popover with dialog for system status details

Replace the dropdown popover with a proper Dialog for runtime status
details. Add a small info button on the System Status card that opens
the dialog. Session details now show in a spacious 2-column grid layout
with full image name, backend, CPU/memory, network, mount path, and
created/last-used timestamps.

web/src/i18n/locales/ja-JP.ts

@@ -1262,6 +1262,8 @@ const jaJP = {
     boxBackend: 'バックエンド',
     boxProfile: 'プロファイル',
     boxSandboxes: 'サンドボックス',
+    boxSessionCreated: '作成日時',
+    boxSessionLastUsed: '最終使用',
   },
   limitation: {
     maxBotsReached: