Editor: Standardize reduced motion handling using media queries

[himanshupathak95]

Part of: #68282

What?

Replace all instances of the reduce-motion mixin with standardized @media not (prefers-reduced-motion) media queries across the editor package components to improve code consistency and maintainability.

Testing Instructions

Test Document Bar and Tools:

• Open the editor
• Hover over the document bar buttons
• Click the inserter toggle (+ button)
• Verify smooth transitions with motion-enabled
• Verify instant changes with reduced motion enabled

Test Publish Panel:

• Click the publish/update button
• Observe the panel slide-in
• Verify smooth animation with motion-enabled
• Verify instant appearance with reduced motion enabled

Screencast

Screen.Recording.2025-01-01.at.15.35.12.mov

Screen.Recording.2025-01-01.at.15.36.33.mov

Screen.Recording.2025-01-01.at.15.38.17.mov

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Co-authored-by: himanshupathak95 <[email protected]>

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