fix: Update the logic to handle attachments in a conversation (#9784)

When the chat is viewed, a function `fetchAllAttachments` is run to get all attachments for a particular conversation. This function, before updating the record creates the `attachments` property on the `chat` object in the store.
If in any case this function fails, the `attachments` property is not created, and when the code reaches the `dashboard/store/modules/conversations/index.js` the error occurs

This PR fixes it by ensuring that `SET_ALL_ATTACHMENTS` is always run. And it handles the default case as well


---

Sentry Issue:
[CHATWOOT-FRONTEND-APP-5Y](https://chatwoot-p3.sentry.io/issues/5459056982/)

```
TypeError: Cannot read properties of undefined (reading 'some')
  at forEach(./app/javascript/dashboard/store/modules/conversations/index.js:160:31)
  at Array.forEach(<anonymous>)
  at mutations(./app/javascript/dashboard/store/modules/conversations/index.js:159:27)
  at handler(./node_modules/vuex/dist/vuex.js:771:7)
  at forEach(./node_modules/vuex/dist/vuex.js:470:9)
  at Array.forEach(<anonymous>)
  at fn(./node_modules/vuex/dist/vuex.js:469:13)
  at Store.prototype._withCommit(./node_modules/vuex/dist/vuex.js:574:5)
  at Store.prototype.commit(./node_modules/vuex/dist/vuex.js:468:10)
  at this.commit(./node_modules/vuex/dist/vuex.js:420:21)
  at call(./app/javascript/dashboard/store/modules/conversations/actions.js:273:7)
  at tryCatch(./node_modules/videojs-record/dist/videojs.record.js:2868:27)
  at _invoke(./node_modules/videojs-record/dist/videojs.record.js:3088:32)
  at prototype[method](./node_modules/videojs-record/dist/videojs.record.js:2921:31)
  at as(/packs/js/application-cf716bca3c984faeb095.js:4:76)
  at as(/packs/js/application-cf716bca3c984faeb095.js:4:76)
  at nrWrapper(/app/accounts/81898/conversations/95:6:17817)
```

---------

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: Sojan Jose <sojan@pepalo.com>
Co-authored-by: Pranav <pranav@chatwoot.com>

app/javascript/dashboard/store/modules/conversations/index.js

@@ -10,6 +10,7 @@ import { emitter } from 'shared/helpers/mitt';
 
 const state = {
   allConversations: [],
+  attachments: {},
   listLoadingStatus: true,
   chatStatusFilter: wootConstants.STATUS_TYPE.OPEN,
   chatSortFilter: wootConstants.SORT_BY_TYPE.LATEST,
@@ -48,7 +49,6 @@ export const mutations = {
           allMessagesLoaded: existingConversation.allMessagesLoaded,
           messages: existingConversation.messages,
           dataFetched: existingConversation.dataFetched,
-          attachments: existingConversation.attachments,
         };
       }
     });
@@ -78,10 +78,10 @@ export const mutations = {
     }
   },
   [types.SET_ALL_ATTACHMENTS](_state, { id, data }) {
-    const [chat] = _state.allConversations.filter(c => c.id === id);
-    if (!chat) return;
-    Vue.set(chat, 'attachments', []);
-    chat.attachments.push(...data);
+    const attachments = _state.attachments[id] || [];
+
+    attachments.push(...data);
+    _state.attachments[id] = [...attachments];
   },
   [types.SET_MISSING_MESSAGES](_state, { id, data }) {
     const [chat] = _state.allConversations.filter(c => c.id === id);
@@ -144,42 +144,37 @@ export const mutations = {
     Vue.set(chat, 'muted', false);
   },
 
-  [types.ADD_CONVERSATION_ATTACHMENTS]({ allConversations }, message) {
-    const { conversation_id: conversationId } = message;
-    const [chat] = getSelectedChatConversation({
-      allConversations,
-      selectedChatId: conversationId,
+  [types.ADD_CONVERSATION_ATTACHMENTS](_state, message) {
+    // early return if the message has not been sent, or has no attachments
+    if (message.status !== MESSAGE_STATUS.SENT || !message.attachments.length) {
+      return;
+    }
+
+    const id = message.conversation_id;
+    const existingAttachments = _state.attachments[id] || [];
+
+    const attachmentsToAdd = message.attachments.filter(attachment => {
+      // if the attachment is not already in the store, add it
+      // this is to prevent duplicates
+      return !existingAttachments.some(
+        existingAttachment => existingAttachment.id === attachment.id
+      );
     });
 
-    if (!chat) return;
-
-    const isMessageSent =
-      message.status === MESSAGE_STATUS.SENT && message.attachments;
-    if (isMessageSent) {
-      message.attachments.forEach(attachment => {
-        if (!chat.attachments.some(a => a.id === attachment.id)) {
-          chat.attachments.push(attachment);
-        }
-      });
-    }
+    // replace the attachments in the store
+    _state.attachments[id] = [...existingAttachments, ...attachmentsToAdd];
   },
 
-  [types.DELETE_CONVERSATION_ATTACHMENTS]({ allConversations }, message) {
-    const { conversation_id: conversationId } = message;
-    const [chat] = getSelectedChatConversation({
-      allConversations,
-      selectedChatId: conversationId,
+  [types.DELETE_CONVERSATION_ATTACHMENTS](_state, message) {
+    if (message.status !== MESSAGE_STATUS.SENT) return;
+
+    const { conversation_id: id } = message;
+    const existingAttachments = _state.attachments[id] || [];
+    if (!existingAttachments.length) return;
+
+    _state.attachments[id] = existingAttachments.filter(attachment => {
+      return attachment.message_id !== message.id;
     });
-
-    if (!chat) return;
-
-    const isMessageSent = message.status === MESSAGE_STATUS.SENT;
-    if (isMessageSent) {
-      const attachmentIndex = chat.attachments.findIndex(
-        a => a.message_id === message.id
-      );
-      if (attachmentIndex !== -1) chat.attachments.splice(attachmentIndex, 1);
-    }
   },
 
   [types.ADD_MESSAGE]({ allConversations, selectedChatId }, message) {