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52475cffd2
Follow-up to #32130 and #37094. Backend: collision-safe node-id sanitization (any invalid character, not just hyphens), topology-aware layered auto-layout, branch-handle repair for if-else / question-classifier edges, duplicate-id and graph-cycle validation, a compacted refine-mode graph prompt (~half the tokens in and out), and an instruction length cap at the API boundary. Frontend: warn when /refine cannot load the current draft instead of silently generating from scratch, cap the session version history, clamp the persisted version index, guard against empty-graph success envelopes, and give slow generations more headroom before the client-side abort. New error codes localised across all 23 locales. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>