LiusCraft 80f6e2bbab feat(session): add per-message created_at timestamps ... - Persistence layer (jsonl.go addMsg/SetHistory) normalizes CreatedAt when missing so the invariant is guaranteed at the storage boundary - API layer (session.go) exposes created_at on all transcript message types with session.updated fallback for legacy messages - Frontend uses per-message timestamps when available - messagesContentEqual ignores CreatedAt for tail-matching after JSONL roundtrip Fixes #2787		2026-05-11 00:45:01 +08:00
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types.go	feat(session): add per-message created_at timestamps	2026-05-11 00:45:01 +08:00