epic(motion): fluid motion UI follow-ups (post-0.4.11)

[ZhuchkaTriplesix]

Goal

Raise perceived fluidity from ~7.5/10 toward a coherent shell: same motion dialect everywhere, honest springs, and morphs on the remaining hard-cut navigations.

Local audit canvas: fluid-motion-ui-review.canvas.tsx (Cursor canvases).

Child issues

• ui(motion): morph workspace object / explorer switches #478 — Morph workspace object / explorer switches (#483)
• ui(motion): bring SDUI tree onto QueryaMotion tokens #479 — Bring SDUI tree onto QueryaMotion tokens (#484)
• ui(motion): unify tree expand chevron and height choreography #480 — Unify tree expand chevron + height choreography (#485)
• ui(motion): make Fluid spring honest (real springs vs emphasized) #481 — Make “Fluid spring” honest (real springs vs emphasized) (#486)
• ui(motion): adopt or delete QueryaHoverSurface; fix update badge Reduced #482 — Adopt or delete QueryaHoverSurface + badge Reduced pulse (#487)

Non-goals

• Animating virtualized result grid rows
• Mid-drag spring on split panes
• Full Lucide / icon redesign (see ui(icons): unify mini-icon system for trees and shared chrome #472)

Acceptance (epic)

• Object/explorer navigation morphs with QueryaMotion tokens
• SDUI tree uses the same chevron/duration dialect as native trees
• Tree expand gesture uses one coordinated clock
• springsEnabled either drives real SpringSimulation or is not branded as spring for cubic-only paths
• Hover primitive is used or removed; update badge respects Reduced

[ZhuchkaTriplesix]

All child issues shipped on dev (#483–#487).