ui(motion): unify tree expand chevron and height choreography

[ZhuchkaTriplesix]

Parent

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

Problem

On native connection trees the same expand gesture uses two clocks:

• Chevron rotate: QueryaMotion.fast + standardCurve (~120ms)
• Height: QueryaAnimatedExpand with standard + enter (~200ms)

Feels slightly desynced (arrow finishes before the branch opens).

Proposal

Pick one coordinated expand token pair (duration + curve) for both chevron and height — either both enter/standard, or a dedicated expand token documented in docs/motion-and-high-refresh.md.

Files

• lib/features/connections/connections_panel_pg_tree.dart (and MySQL/SQLite/Redis/Mongo siblings)
• lib/core/motion/querya_animated_expand.dart
• docs/motion-and-high-refresh.md

Acceptance

• Chevron and height share one intentional timing (documented if offset remains)
• All driver trees updated consistently
• Reduced / Off still work

[ZhuchkaTriplesix]

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