Allow data syncing and deletion

pug/settings.pug

@@ -49,3 +49,32 @@ block content
 
       .save-settings
         button.border-look Save
+
+    details.data-management
+      summary Sync data
+      p Open this link elsewhere to import your current CloudTube session there.
+      p.
+        If you clear your cookies often, you can bookmark this link and open it
+        to restore your data, or if you have multiple devices, you can send this
+        link to them to import your session and automatically keep everything
+        in sync.
+      - let url = `/formapi/importsession/${user.token}`
+      a(href=url)= url
+
+    details.data-management.delete-details
+      summary Delete data
+      p Press this button to erase all your data from CloudTube.
+      p.
+        Just the current session will be removed. If you lost access to a
+        previous session, you cannot touch it.
+      p.
+        You will lose your subscriptions, watch history, settings, and anything
+        else you stored on the server. The server will keep no record that they
+        ever existed.
+      p Deletion is instant and #[em cannot be undone.]
+      input(type="checkbox" id="delete-confirm")
+      .delete-confirm-container
+        label(for="delete-confirm").delete-confirm-label I understand the consequences
+      form(method="post" action="/formapi/erase")
+        input(type="hidden" name="token" value=user.token)
+        button.border-look#delete-button Permanently erase my data

pug/subscriptions.pug

@@ -26,6 +26,7 @@ block content
             - const notLoaded = channels.length - refreshed.count
             if notLoaded
               div #{notLoaded} subscriptions have not been refreshed at all
+            div Your subscriptions will be regularly refreshed in the background so long as you log in frequently.
 
       if settings.save_history
         input(type="checkbox" id="watched-videos-display")