ui(motion): bring SDUI tree onto QueryaMotion tokens

[ZhuchkaTriplesix]

Parent

Part of epic #477 (fluid motion follow-ups).

Problem

SduiTreeBuilder still uses a third motion dialect:

• IconButton + AnimatedRotation with Duration(milliseconds: 160) and raw Curves.easeOutCubic
• No context.motionDuration / motionCurve
• Flat ListView expand — no QueryaAnimatedExpand height morph (unlike native trees)

This shows up for extension drivers and any SDUI schema tree.

Proposal

1. Replace magic duration/curve with QueryaIcons.expandClosed + context.motionDuration(QueryaMotion.fast) + motionCurve
2. Align expand affordance with native trees; add height morph if compatible with virtualized flatten

Files

• lib/core/sdui/sdui_tree_builder.dart
• test/core/sdui/sdui_builders_test.dart

Acceptance

• No hardcoded Duration/Curves for expand chevron
• Expand respects Reduced / Off
• Visual parity with PG/MySQL/SQLite tree chevrons
• Existing SDUI expand/lazy-load tests updated and green

[ZhuchkaTriplesix]

Shipped on dev (PR targeted dev, so auto-close did not fire). See related merged PRs.