Big batch of UI updates (#276)

* Replace react-native-root-toast with a custom toast that fits the visual style

* Tune dark mode colors

* Tune colors a bit more

* Move the reply prompt to a fixed position in the footer

* Fully hide muted posts but give a control to show anyway (close #270)

* Improve thread rendering (better clarity on reply lines)

* Add follower/following counts to side menu

* Fix issues with display name overflows

src/lib/themes.ts

@@ -21,6 +21,7 @@ export const defaultTheme: Theme = {
       replyLine: colors.gray2,
       replyLineDot: colors.gray3,
       unreadNotifBg: '#ebf6ff',
+      unreadNotifBorder: colors.blue1,
       postCtrl: '#71768A',
       brandText: '#0066FF',
       emptyStateIcon: '#B6B6C9',
@@ -296,15 +297,16 @@ export const darkTheme: Theme = {
       textLight: colors.gray3,
       textInverted: colors.black,
       link: colors.blue3,
-      border: colors.gray6,
-      borderDark: colors.gray5,
+      border: colors.black,
+      borderDark: colors.gray6,
       icon: colors.gray4,
 
       // non-standard
       textVeryLight: colors.gray4,
       replyLine: colors.gray5,
       replyLineDot: colors.gray6,
-      unreadNotifBg: colors.blue5,
+      unreadNotifBg: colors.blue7,
+      unreadNotifBorder: colors.blue6,
       postCtrl: '#61657A',
       brandText: '#0085ff',
       emptyStateIcon: colors.gray4,