ui(motion): adopt or delete QueryaHoverSurface; fix update badge Reduced

[ZhuchkaTriplesix]

Parent

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

Problem

1. QueryaHoverSurface is implemented and tested but has zero product call sites. Connection tiles / type cards use InkWell or one-off AnimatedContainer.
2. Update available badge pulse stops for Off / OS disableAnimations, but Reduced still pulses at full period (~1400ms).

Optional related polish: Extension Manager still uses plain IndexedStack (no QueryaCrossFadeStack / tab strip).

Proposal

• Wire QueryaHoverSurface on connection/type-card chrome or delete the unused API + tests
• Scale or stop badge pulse under Reduced
• (Optional) Extension Manager → QueryaCrossFadeStack + QueryaTabStrip

Files

• lib/core/motion/querya_hover_surface.dart
• Connection sidebar / new_connection_dialog.dart / theme picker cards
• Update badge widget (title bar)
• extension_manager_dialog.dart (optional)

Acceptance

• HoverSurface is used in ≥1 real surface or removed with tests
• Badge pulse respects Reduced (shorter / lower opacity / off)
• Accessibility: Off + OS disable still fully quiet

[ZhuchkaTriplesix]

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