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/lib/navigation.ts

@@ -0,0 +1,12 @@
+import {useEffect} from 'react'
+import {useStores} from '../../state'
+
+type CB = () => void
+/**
+ * This custom effect hook will trigger on every "navigation"
+ * Use this in screens to handle any loading behaviors needed
+ */
+export function useLoadEffect(cb: CB, deps: any[] = []) {
+  const store = useStores()
+  useEffect(cb, [store.nav.tab, ...deps])
+}