0.48.3: Assistant publication identity hotfix

• Thread restore display identity: Restoring or reclaiming a Thread now renames the destination from its current Workspace display title when available, rather than leaking the internal baked slot name such as Moss into directory-title mode.
• Assistant publication identity: An empty terminal assistant message may recover an earlier preserved answer, but it no longer republishes that text when the same Telegram intermediate output was already admitted; the pre-send turn fence also prevents lost-acknowledgement retries while allowing later turns.