fix(mobile): show premium modal on iOS

packages/web/src/javascripts/Components/Preferences/Panes/Account/Subscription/NoSubscription.tsx

@@ -15,7 +15,11 @@ const NoSubscription: FunctionComponent<Props> = ({ application }) => {
     const errorMessage = 'There was an error when attempting to redirect you to the subscription page.'
     setIsLoadingPurchaseFlow(true)
     try {
-      application.openPurchaseFlow()
+      if (application.isNativeIOS()) {
+        application.showPremiumModal()
+      } else {
+        application.openPurchaseFlow()
+      }
     } catch (e) {
       setPurchaseFlowError(errorMessage)
     } finally {

packages/web/src/javascripts/Components/Preferences/Panes/Account/SubscriptionSharing/NoProSubscription.tsx

@@ -15,7 +15,11 @@ const NoProSubscription: FunctionComponent<Props> = ({ application }) => {
     const errorMessage = 'There was an error when attempting to redirect you to the subscription page.'
     setIsLoadingPurchaseFlow(true)
     try {
-      application.openPurchaseFlow()
+      if (application.isNativeIOS()) {
+        application.showPremiumModal()
+      } else {
+        application.openPurchaseFlow()
+      }
     } catch (e) {
       setPurchaseFlowError(errorMessage)
     } finally {

packages/web/src/javascripts/Components/Preferences/Panes/HelpFeedback.tsx

@@ -42,12 +42,20 @@ const HelpAndFeedback = ({ application }: { application: WebApplication }) => {
             </a>
           </Text>
           {application.isNativeIOS() && (
-            <LinkButton
-              className="mt-3"
-              label="Privacy Policy"
-              link="https://standardnotes.com/privacy"
-              onClick={handleClick}
-            />
+            <>
+              <LinkButton
+                className="mt-3"
+                label="Privacy Policy"
+                link="https://standardnotes.com/privacy"
+                onClick={handleClick}
+              />
+              <LinkButton
+                className="mt-3"
+                label="Terms of Use"
+                link="https://www.apple.com/legal/internet-services/itunes/dev/stdeula/"
+                onClick={handleClick}
+              />
+            </>
           )}
         </PreferencesSegment>
         <HorizontalSeparator classes="my-4" />