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- Add DeleteSessionAsync to ISessionStore/SessionService (unpublish portfolio card, remove bot-created empty forum topic, update batch message). - Add DeleteSessionForCurrentUserAsync to AuthorizedSessionService with audit log. - Add delete button + confirmation dialog to GroupDetails.razor. - Extend dashboard Playwright tests with edit persistence and delete verification. - Update AuthorizedSessionServiceTests with delete authorization coverage. - Mark issue #150 as done in tests/e2e/README.md. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>