Demo creator should be simplified into a scratch-style drag-and-drop builder

[Yashb404]

Summary

Current demo creator is too complex and should move toward a simpler scratch-like drag-and-drop authoring experience.

Current Behavior

• Authoring flow is dense and editor-heavy.
• Step composition is less intuitive for first-time users.
• High friction for common workflows.

Expected Behavior

• Visual drag-and-drop authoring for step blocks.
• Clear flow from draft -> preview -> publish.
• Reduced complexity for beginners while preserving advanced controls.

Scope

• Design simplified creator IA and interaction model.
• Introduce draggable step blocks and reorder mechanics.
• Add contextual quick actions for common step patterns.
• Keep advanced editing available behind progressive disclosure.

Acceptance Criteria

• Users can add/reorder/delete steps via drag-and-drop.
• Common authoring tasks are faster and require fewer clicks.
• Advanced options remain available without cluttering default UI.
• New flow is validated against at least one end-to-end demo creation scenario.