Update posts in feed to use the theming system

src/view/lib/styles.ts

@@ -1,4 +1,5 @@
-import {StyleSheet} from 'react-native'
+import {StyleSheet, TextStyle} from 'react-native'
+import {Theme, TypographyVariant} from './ThemeContext'
 
 // 1 is lightest, 2 is light, 3 is mid, 4 is dark, 5 is darkest
 export const colors = {
@@ -191,3 +192,13 @@ export const s = StyleSheet.create({
   green4: {color: colors.green4},
   green5: {color: colors.green5},
 })
+
+export function lh(
+  theme: Theme,
+  type: TypographyVariant,
+  height: number,
+): TextStyle {
+  return {
+    lineHeight: (theme.typography[type].lineHeight || 16) * height,
+  }
+}