fix(studio): remove motion tab from right panel (#1391)

The motion panel was behind a feature flag defaulting to false and never
shipped. Remove the tab button, MotionPanel component, feature flag,
and all associated wiring (EaseCurveEditor, SpringEaseEditor,
MotionPanelFields, MotionPathOverlay). The underlying motion data
infrastructure (studioMotion, studioMotionOps) remains intact for the
GSAP panel.

Co-authored-by: Miguel Ángel <miguelangelsisi098@gmail.com>

packages/studio/src/contexts/DomEditContext.tsx

@@ -37,8 +37,7 @@ export function DomEditProvider({
     handleDomBoxSizeCommit,
     handleDomRotationCommit,
     handleDomManualEditsReset,
-    handleDomMotionCommit,
-    handleDomMotionClear,
+
     handleDomTextCommit,
     handleDomTextFieldStyleCommit,
     handleDomAddTextField,
@@ -111,8 +110,6 @@ export function DomEditProvider({
       handleDomBoxSizeCommit,
       handleDomRotationCommit,
       handleDomManualEditsReset,
-      handleDomMotionCommit,
-      handleDomMotionClear,
       handleDomTextCommit,
       handleDomTextFieldStyleCommit,
       handleDomAddTextField,
@@ -179,8 +176,6 @@ export function DomEditProvider({
       handleDomBoxSizeCommit,
       handleDomRotationCommit,
       handleDomManualEditsReset,
-      handleDomMotionCommit,
-      handleDomMotionClear,
       handleDomTextCommit,
       handleDomTextFieldStyleCommit,
       handleDomAddTextField,