feat: Adds message signature for new email conversations (#7946)

Co-authored-by: Shivam Mishra <scm.mymail@gmail.com>

app/javascript/dashboard/components/widgets/conversation/MessageSignatureMissingAlert.vue

@@ -0,0 +1,28 @@
+<template>
+  <div
+    class="my-0 mx-4 px-1 flex max-h-[8vh] items-baseline justify-between hover:bg-slate-25 dark:hover:bg-slate-800 border border-dashed border-slate-100 dark:border-slate-700 rounded-sm overflow-auto"
+  >
+    <p class="w-fit !m-0">
+      {{ $t('CONVERSATION.FOOTER.MESSAGE_SIGNATURE_NOT_CONFIGURED') }}
+      <woot-button
+        color-scheme="primary"
+        variant="link"
+        @click="openProfileSettings"
+      >
+        {{ $t('CONVERSATION.FOOTER.CLICK_HERE') }}
+      </woot-button>
+    </p>
+  </div>
+</template>
+
+<script>
+export default {
+  methods: {
+    openProfileSettings() {
+      return this.$router.push({ name: 'profile_settings_index' });
+    },
+  },
+};
+</script>
+
+<style></style>