Remove deprecated models and mobx usage (react-query refactor) (#1934)

* Update login page to use service query

* Update modal to use session instead of store

* Move image sizes cache off store

* Update settings to no longer use store

* Update link-meta fetch to use agent instead of rootstore

* Remove deprecated resolveName()

* Delete deprecated link-metas cache

* Delete deprecated posts cache

* Delete all remaining mobx models, including the root store

* Strip out unused mobx observer wrappers

src/view/com/modals/SelfLabel.tsx

@@ -1,6 +1,5 @@
 import React, {useState} from 'react'
 import {StyleSheet, TouchableOpacity, View} from 'react-native'
-import {observer} from 'mobx-react-lite'
 import {Text} from '../util/text/Text'
 import {s, colors} from 'lib/styles'
 import {usePalette} from 'lib/hooks/usePalette'
@@ -17,7 +16,7 @@ const ADULT_CONTENT_LABELS = ['sexual', 'nudity', 'porn']
 
 export const snapPoints = ['50%']
 
-export const Component = observer(function Component({
+export function Component({
   labels,
   hasMedia,
   onChange,
@@ -161,7 +160,7 @@ export const Component = observer(function Component({
       </View>
     </View>
   )
-})
+}
 
 const styles = StyleSheet.create({
   container: {