epic(ui): post-motion UI polish (dev review ~7.5/10)

[ZhuchkaTriplesix]

Goal

Close gaps from the UI review on dev after motion epic #477 and icons #472 — raise shell coherence past ~7.5/10.

Local canvas: ui-review-dev.canvas.tsx.

Child issues

P0

• bug(ui): Preferences CheckboxListTile under DecoratedBox (Flutter 3.44) #491 — Preferences CheckboxListTile / DecoratedBox assert (Flutter 3.44)
• bug(ui): SDUI CheckboxListTile under opaque dialog DecoratedBox #492 — SDUI CheckboxListTile same assert path

P1

• ui(motion): TabStrip Reduced should cubic-animate indicator (not snap) #493 — TabStrip Reduced: cubic fallback (not snap)
• ui(motion): morph connection A→B switches in WorkspacePanel #494 — Workspace connection A→B morph (QueryaFadeSlide)
• ui(extensions): Updates tab must not show false “up to date” #495 — Extension Manager Updates tab honesty
• ui(trees): tokenize sidebar header chevrons and finish QueryaIcons #496 — Sidebar header chevron/icon tokens (finish ui(icons): unify mini-icon system for trees and shared chrome #472)
• ui(icons): resolve dead QueryaIconSizes.sduiNode token #497 — Resolve dead QueryaIconSizes.sduiNode
• ui(trees): align Mongo sidebar hierarchy with other drivers #498 — Align Mongo tree hierarchy with other drivers
• ui(settings): theme picker exit motion + trigger expand parity #499 — Theme picker exit motion + trigger expand parity
• fix(macos): hide duplicate bitsdojo window buttons in title bar #500 — macOS: hide duplicate bitsdojo window buttons

P2

• ui: P2 polish checklist (trees, motion, chrome) #501 — Trees / motion / chrome polish checklist

Non-goals

• Marketplace live Updates API (0.5.0)
• Animating virtualized result grid rows
• Full Lucide redesign

Acceptance (epic)

• Preferences + SDUI checkboxes do not trip ListTile/DecoratedBox assert
• Reduced motion: tab pill animates (halved), does not jump
• Connection switches morph; sidebar headers use shared icon tokens
• Updates tab does not show false “up to date”
• macOS title bar has a single set of window controls