🎨 Palette: Display disabled cursor on inactive controls

[jspann21]

💡 What: Removed disabled:pointer-events-none utility class from disabled zoom control buttons in the UI.

🎯 Why: In Tailwind CSS, pointer-events-none prevents the browser from registering mouse events on the element. As a result, native cursor hover styles (like disabled:cursor-not-allowed) cannot trigger. By removing pointer-events-none, the UI now correctly shows the "not-allowed" icon when hovering over disabled elements. The <button disabled> attribute handles click prevention natively, rendering pointer-events-none redundant for safety.

📸 Before/After: Visual verification was performed with Playwright checking layout constraints. The change purely affects cursor hover state feedback.

♿ Accessibility: Gives clear visual feedback to mouse/pointer users when an interactive element is intentionally non-interactive.

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PR created automatically by Jules for task 5861043791371251344 started by @jspann21

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