ui(motion): morph connection A→B switches in WorkspacePanel

[ZhuchkaTriplesix]

Parent

Part of epic #490. Follow-up to #478.

Problem

Empty↔connected and home↔object already morph via QueryaSwitchingBody / FadeSlide. Switching connection A→B keeps SwitchingBody index 1 and replaces the child in place → hard cut.

Proposal

Wrap active connection body in QueryaFadeSlide keyed by connection id (and/or driver type), or add a morph layer for connection identity changes.

Files

• lib/features/main_screen/workspace_panel.dart

Acceptance

• Selecting another connection cross-fades (tokens + Reduced/Off)
• No regression on empty↔connected / home↔object morphs
• SQL editor state for inactive connections still preserved where intended

[ZhuchkaTriplesix]

Shipped on dev (PR targeted dev, auto-close did not fire).