Extract center column offset, reduce by 20px (#7974)

* extract offset, reduce by 20px

* move constant to `Layout/const.ts`

src/components/Layout/Header/index.tsx

@@ -23,6 +23,7 @@ import {ArrowLeft_Stroke2_Corner0_Rounded as ArrowLeft} from '#/components/icons
 import {Menu_Stroke2_Corner0_Rounded as Menu} from '#/components/icons/Menu'
 import {
   BUTTON_VISUAL_ALIGNMENT_OFFSET,
+  CENTER_COLUMN_OFFSET,
   HEADER_SLOT_SIZE,
   SCROLLBAR_OFFSET,
 } from '#/components/Layout/const'
@@ -65,7 +66,7 @@ export function Outer({
         gtMobile && [a.mx_auto, {maxWidth: 600}],
         !isWithinOffsetView && {
           transform: [
-            {translateX: centerColumnOffset ? -150 : 0},
+            {translateX: centerColumnOffset ? CENTER_COLUMN_OFFSET : 0},
             {translateX: web(SCROLLBAR_OFFSET) ?? 0},
           ],
         },

src/components/Layout/const.ts

@@ -14,3 +14,8 @@ export const BUTTON_VISUAL_ALIGNMENT_OFFSET = 3
  * Corresponds to the width of a small square or round button
  */
 export const HEADER_SLOT_SIZE = 34
+
+/**
+ * How far to shift the center column when in the tablet breakpoint
+ */
+export const CENTER_COLUMN_OFFSET = -130

src/components/Layout/index.tsx

@@ -21,7 +21,7 @@ import {
   web,
 } from '#/alf'
 import {useDialogContext} from '#/components/Dialog'
-import {SCROLLBAR_OFFSET} from '#/components/Layout/const'
+import {CENTER_COLUMN_OFFSET, SCROLLBAR_OFFSET} from '#/components/Layout/const'
 import {ScrollbarOffsetContext} from '#/components/Layout/context'
 
 export * from '#/components/Layout/const'
@@ -173,7 +173,7 @@ export const Center = React.memo(function LayoutContent({
                 centerColumnOffset &&
                 !ignoreTabletLayoutOffset &&
                 !isWithinDialog
-                  ? -150
+                  ? CENTER_COLUMN_OFFSET
                   : 0,
             },
             {translateX: web(SCROLLBAR_OFFSET) ?? 0},
@@ -209,7 +209,7 @@ const WebCenterBorders = React.memo(function LayoutContent() {
           left: '50%',
           transform: [
             {translateX: '-50%'},
-            {translateX: centerColumnOffset ? -150 : 0},
+            {translateX: centerColumnOffset ? CENTER_COLUMN_OFFSET : 0},
             ...a.scrollbar_offset.transform,
           ],
         }),