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

* extract offset, reduce by 20px

* move constant to `Layout/const.ts`

src/view/shell/desktop/LeftNav.tsx

@@ -69,6 +69,7 @@ import {
   UserCircle_Filled_Corner0_Rounded as UserCircleFilled,
   UserCircle_Stroke2_Corner0_Rounded as UserCircle,
 } from '#/components/icons/UserCircle'
+import {CENTER_COLUMN_OFFSET} from '#/components/Layout'
 import * as Menu from '#/components/Menu'
 import * as Prompt from '#/components/Prompt'
 import {Text} from '#/components/Typography'
@@ -559,7 +560,10 @@ export function DesktopLeftNav() {
         leftNavMinimal && styles.leftNavMinimal,
         {
           transform: [
-            {translateX: centerColumnOffset ? -450 : -300},
+            {
+              translateX:
+                -300 + (centerColumnOffset ? CENTER_COLUMN_OFFSET : 0),
+            },
             {translateX: '-100%'},
             ...a.scrollbar_offset.transform,
           ],