Refactor sidebar (#6971)

* Refactor RightNav

(cherry picked from commit 96bb02acfd2d7452df18a0e7410e6a7169a583ed)

* Better gutter handling

* Clean up styles

* Memoize breakpoints

* Format

* Comment

* Loosen spacing, handle overflow, smaller text to match prod

* Fix circular imports on native

* Return 0 instead of undefined for easier calculations

* Re-assign

* Fix

* Port over fix from subs/base

* Space out right nav feeds, widen sidebar to match prod

* Fix lost padding on home header

* Fix perf by not actually linking to new URL

* Remove underline on focus

* Foramt

---------

Co-authored-by: Dan Abramov <dan.abramov@gmail.com>

src/components/Layout/Header/index.tsx

@@ -13,7 +13,7 @@ import {
   platform,
   TextStyleProp,
   useBreakpoints,
-  useGutterStyles,
+  useGutters,
   useTheme,
 } from '#/alf'
 import {Button, ButtonIcon, ButtonProps} from '#/components/Button'
@@ -34,7 +34,7 @@ export function Outer({
   noBottomBorder?: boolean
 }) {
   const t = useTheme()
-  const gutter = useGutterStyles()
+  const gutters = useGutters([0, 'base'])
   const {gtMobile} = useBreakpoints()
   const {isWithinOffsetView} = useContext(ScrollbarOffsetContext)
 
@@ -46,7 +46,7 @@ export function Outer({
         a.flex_row,
         a.align_center,
         a.gap_sm,
-        gutter,
+        gutters,
         platform({
           native: [a.pb_sm, a.pt_xs],
           web: [a.py_sm],