feat: fixes for bubble UI (#10643)

This PR applies the following fixes

1. Images in emails have margins, causing unnecessary gaps when 1x1px
images are loaded (ref:
[42111](https://app.chatwoot.com/app/accounts/1/conversations/42111?messageId=96215315))
2. Two adjacent `<br>` tags would add a huge gap, fixed this (ref:
[42111](https://app.chatwoot.com/app/accounts/1/conversations/42111?messageId=96215315))
3. Color for outgoing emails is wrong (ref:
[41621](https://app.chatwoot.com/app/accounts/1/conversations/41621?messageId=93560032))
4. Wrong list styles (see:
[42372](https://app.chatwoot.com/app/accounts/1/conversations/42372?messageId=96208130))
5. Wrong bubble color when outgoing message is sent by a bot or captain
6. Wrong avatar when outgoing message is sent by a bot or captain

app/javascript/dashboard/components-next/message/bubbles/Email/Index.vue

@@ -69,7 +69,11 @@ const textToShow = computed(() => {
             {{ $t('EMAIL_HEADER.EXPAND') }}
           </button>
         </div>
-        <FormattedContent v-if="isOutgoing && content" :content="content" />
+        <FormattedContent
+          v-if="isOutgoing && content"
+          class="text-n-slate-12"
+          :content="content"
+        />
         <template v-else>
           <Letter
             v-if="showQuotedMessage"