[nextgen/cardstack] big improvements

- Implement return types
- page numbers
- better subpage resolve delay
- error handling and system error cards
- code cleanup

commands/message/search/anime.js

@@ -1,10 +1,10 @@
 const { anime, animeSupplemental} = require('#api');
 const { PERMISSION_GROUPS, OMNI_ANIME_FORMAT_TYPES, COLORS_HEX} = require('#constants');
 
-const { createDynamicCardStack } = require("#cardstack");
+const { createDynamicCardStack, CARD_STACK_CONSTANTS } = require("#cardstack");
 
 const { hexToDecimalColor } = require("#utils/color");
-const { createEmbed, formatPaginationEmbeds, page } = require('#utils/embed');
+const { createEmbed, page } = require('#utils/embed');
 const { acknowledge } = require('#utils/interactions');
 const { smallPill, link, pill, stringwrapPreserveWords, timestamp, TIMESTAMP_FLAGS} = require('#utils/markdown');
 const { editOrReply } = require('#utils/message');
@@ -106,7 +106,7 @@ module.exports = {
       if(!pages.length) return editOrReply(context, createEmbed("warning", context, `No results found.`))
       
       createDynamicCardStack(context, {
-        cards: formatPaginationEmbeds(pages),
+        cards: pages,
         interactive: {
           episodes_button: {
             label: "Episodes",
@@ -152,7 +152,15 @@ module.exports = {
                 return page(card)
               })
 
-              return formatPaginationEmbeds(cards);
+              return {
+                type: CARD_STACK_CONSTANTS.RESOLVE_CALLBACK_TYPES.SUBSTACK,
+                cards: cards.length >= 1 ? cards : [
+                  // This happens if the episode metadata resolver fails.
+                  page(createEmbed("defaultNoFooter", context, {
+                    description: `-# ${pg.getState("name")} › **Episodes**\n## Episodes Unavailable\n\nWe're unable to display episode details for this content.`
+                  }))
+                ],
+              };
             }
           },
           characters_button: {
@@ -190,7 +198,10 @@ module.exports = {
                 return page(card)
               })
 
-              return formatPaginationEmbeds(cards);
+              return {
+                type: CARD_STACK_CONSTANTS.RESOLVE_CALLBACK_TYPES.SUBSTACK,
+                cards: cards
+              };
             }
           },
           related_button: {
@@ -214,9 +225,12 @@ module.exports = {
 
               let cards = episodes.response.body.relations.map((e) => renderAnimeResultsPage(context, e, false))
 
-              return formatPaginationEmbeds(cards);
+              return {
+                type: CARD_STACK_CONSTANTS.RESOLVE_CALLBACK_TYPES.SUBSTACK,
+                cards: cards
+              };
             }
-          },
+          }
         }
       });
     }catch(e){