refactor(motion): replace raw Duration and curves with QueryaMotion tokens in scroll animations #1240

Problem

Per docs/motion-and-high-refresh.md and .cursor/rules/querya-motion.mdc:

• "Prefer QueryaMotion tokens via context.motionDuration / context.motionCurve."
• "Do not add bare Duration(milliseconds: …) for UI animation without going through tokens."

Hardcoded durations and raw curves were found in UI scroll animations:

• lib/features/redis/redis_cli_workspace.dart:314:

  _scrollController.animateTo(
    _scrollController.position.maxScrollExtent,
    duration: const Duration(milliseconds: 150),
    curve: material.Curves.easeOut,
  );

• lib/features/redis/redis_keys_view.dart:740:

  duration: const Duration(milliseconds: 150),

Scope

• Replace bare Duration(milliseconds: 150) and Curves.easeOut with context.motionDuration(QueryaMotionDurationToken.fast) / QueryaMotion.fast and corresponding motion curves.
• Honor user preferences for reduced motion / disableAnimations.

Acceptance

• Scroll animations in Redis workspaces use QueryaMotion tokens.
• No regression in CLI console auto-scroll or key list navigation.