fix(tokens): add motion tokens and compatibility aliases for TypeScript errors

- Add tokens.motion with duration and easing values for animation timing
- Add tokens.zIndex.notifications alias for compatibility
- Add sizes.layout.panelHeader for AuxiliaryBar panel header height

Resolves TypeScript errors in AuxiliaryBar, NotificationCenter, ToastManager,
and other components that reference tokens.motion and related properties.

AGENT1 Core & App Shell Analysis

Author: factorydroid

cortex-gui/src/design-system/tokens/index.ts

@@ -222,6 +222,7 @@ export const zIndex = {
   popover: 'var(--z-popover)',
   tooltip: 'var(--z-tooltip)',
   notification: 'var(--z-notification)',
+  notifications: 'var(--z-notification)',  // Alias for compatibility
   max: 'var(--z-max)',
 } as const;
 
@@ -235,6 +236,26 @@ export const transitions = {
   slow: 'var(--transition-slow)',
 } as const;
 
+// =============================================================================
+// MOTION TOKENS (for animation timing)
+// =============================================================================
+
+export const motion = {
+  duration: {
+    instant: '50ms',
+    fast: '100ms',
+    normal: '200ms',
+    slow: '300ms',
+  },
+  easing: {
+    standard: 'cubic-bezier(0.4, 0.0, 0.2, 1)',
+    easeIn: 'cubic-bezier(0.4, 0.0, 1, 1)',
+    easeOut: 'cubic-bezier(0.0, 0.0, 0.2, 1)',
+    easeInOut: 'cubic-bezier(0.4, 0.0, 0.2, 1)',
+    spring: 'cubic-bezier(0.175, 0.885, 0.32, 1.275)',
+  },
+} as const;
+
 // =============================================================================
 // SIZE TOKENS
 // =============================================================================
@@ -252,6 +273,7 @@ export const sizes = {
     tab: 'var(--height-tab)',
     titlebar: 'var(--height-titlebar)',
     statusbar: 'var(--height-statusbar)',
+    panelHeader: 'var(--height-panel-header, 35px)',
     sidebar: 'var(--width-sidebar)',
     sidebarMin: 'var(--width-sidebar-min)',
     activityBar: 'var(--width-activitybar)',
@@ -431,6 +453,7 @@ export const tokens = {
   shadows,
   zIndex,
   transitions,
+  motion,
   sizes,
   components,
   vibeColors,