New navigation model (#1)

* Flatten all routing into a single stack

* Replace router with custom implementation

* Add shell header and titles

* Add tab selector

* Add back/forward history menus on longpress

* Fix: don't modify state during render

* Add refresh() to navigation and reroute navigations to the current location to refresh instead of add to history

* Cache screens during navigation to maintain scroll position and improve load-time for renders

src/view/shell/desktop-web/left-column.tsx

@@ -1,13 +1,11 @@
 import React from 'react'
 import {Pressable, View, StyleSheet} from 'react-native'
-import {Link} from '@react-navigation/native'
-import {useRoute} from '@react-navigation/native'
 
 export const NavItem: React.FC<{label: string; screen: string}> = ({
   label,
   screen,
 }) => {
-  const route = useRoute()
+  const Link = <></> // TODO
   return (
     <View>
       <Pressable
@@ -18,7 +16,7 @@ export const NavItem: React.FC<{label: string; screen: string}> = ({
         <Link
           style={[
             styles.navItemLink,
-            route.name === screen && styles.navItemLinkSelected,
+            false /* TODO route.name === screen*/ && styles.navItemLinkSelected,
           ]}
           to={{screen, params: {}}}>
           {label}