feat(inbox): Enable conversation continuity for social channels (#11079)

## Summary
This PR enables and surfaces **conversation workflow** for social-style
channels that should support either:
- `Create new conversations` after resolve, or
- `Reopen same conversation`

## What is included
- Adds the conversation workflow setting UI as card-based options in
Inbox Settings.
- Expands channel availability in settings to include channels like:
  - Telegram
  - TikTok
  - Instagram
  - Line
  - WhatsApp
  - Facebook
- Updates conversation selection behavior for Line incoming messages to
respect the workflow (reopen vs create-new-after-resolved).
- Updates TikTok conversation selection behavior to respect the workflow
(reopen vs create-new-after-resolved).
- Keeps email behavior unchanged (always starts a new thread).

Fixes: https://github.com/chatwoot/chatwoot/issues/8426

## Screenshot

<img width="1400" height="900" alt="pr11079-workflow-sender-clear-tight"
src="https://github.com/user-attachments/assets/9456821f-8d83-4924-8dcf-7503c811a7b1"
/>


## How To Reproduce
1. Open `Settings -> Inboxes ->
<Telegram/TikTok/Instagram/Line/Facebook/WhatsApp inbox> -> Settings`.
2. Verify **Conversation workflow** is visible with the two card
options.
3. Toggle between both options and save.
4. For Line and TikTok, verify resolved-conversation behavior follows
the selected workflow.

## Testing
- `RAILS_ENV=test bundle exec rspec
spec/builders/messages/instagram/message_builder_spec.rb:213
spec/builders/messages/instagram/message_builder_spec.rb:255
spec/builders/messages/instagram/messenger/message_builder_spec.rb:228
spec/builders/messages/instagram/messenger/message_builder_spec.rb:293
spec/services/tiktok/message_service_spec.rb`
- Result: `16 examples, 0 failures`

## Follow-up
- Migrate Website Live Chat workflow settings into this same
conversation-workflow settings model.
- Add Voice channel support for this workflow setting.

---------

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: iamsivin <iamsivin@gmail.com>

app/javascript/dashboard/components-next/radioCard/RadioCard.story.vue

@@ -0,0 +1,61 @@
+<script setup>
+import { ref } from 'vue';
+import RadioCard from './RadioCard.vue';
+
+const selectedOption = ref('round_robin');
+
+const handleSelect = value => {
+  selectedOption.value = value;
+  console.log('Selected:', value);
+};
+</script>
+
+<template>
+  <Story
+    title="Components/AgentManagementPolicy/RadioCard"
+    :layout="{ type: 'grid', width: '600px' }"
+  >
+    <Variant title="Basic Usage">
+      <div class="p-8 bg-n-background space-y-4">
+        <RadioCard
+          id="round_robin"
+          label="Round Robin"
+          description="Distributes conversations evenly among all available agents in a rotating manner"
+          :is-active="selectedOption === 'round_robin'"
+          @select="handleSelect"
+        />
+        <RadioCard
+          id="balanced"
+          label="Balanced Assignment"
+          description="Assigns conversations based on agent workload to maintain balance"
+          :is-active="selectedOption === 'balanced'"
+          @select="handleSelect"
+        />
+      </div>
+    </Variant>
+
+    <Variant title="Active State">
+      <div class="p-8 bg-n-background">
+        <RadioCard
+          id="active_option"
+          label="Active Option"
+          description="This option is currently selected and active"
+          is-active
+          @select="handleSelect"
+        />
+      </div>
+    </Variant>
+
+    <Variant title="Inactive State">
+      <div class="p-8 bg-n-background">
+        <RadioCard
+          id="inactive_option"
+          label="Inactive Option"
+          description="This option is not selected and can be clicked to activate"
+          is-active
+          @select="handleSelect"
+        />
+      </div>
+    </Variant>
+  </Story>
+</template>

app/javascript/dashboard/components-next/radioCard/RadioCard.vue

@@ -0,0 +1,79 @@
+<script setup>
+import Label from 'dashboard/components-next/label/Label.vue';
+
+const props = defineProps({
+  id: {
+    type: String,
+    required: true,
+  },
+  label: {
+    type: String,
+    required: true,
+  },
+  description: {
+    type: String,
+    required: true,
+  },
+  isActive: {
+    type: Boolean,
+    default: false,
+  },
+  disabled: {
+    type: Boolean,
+    default: false,
+  },
+  disabledLabel: {
+    type: String,
+    default: '',
+  },
+  disabledMessage: {
+    type: String,
+    default: '',
+  },
+});
+
+const emit = defineEmits(['select']);
+
+const handleChange = () => {
+  if (!props.isActive && !props.disabled) {
+    emit('select', props.id);
+  }
+};
+</script>
+
+<template>
+  <div
+    class="cursor-pointer rounded-xl outline outline-1 p-4 transition-all duration-200 bg-n-solid-1 py-4 ltr:pl-4 rtl:pr-4 ltr:pr-6 rtl:pl-6"
+    :class="[
+      disabled ? 'opacity-50 cursor-not-allowed' : 'cursor-pointer',
+      isActive ? 'outline-n-blue-9' : 'outline-n-weak',
+      !disabled && !isActive ? 'hover:outline-n-strong' : '',
+    ]"
+    @click="handleChange"
+  >
+    <div class="flex flex-col gap-2 items-start">
+      <div class="flex items-center justify-between w-full gap-3">
+        <div class="flex items-center gap-2">
+          <h3 class="text-heading-3 text-n-slate-12">
+            {{ label }}
+          </h3>
+          <Label v-if="disabled" :label="disabledLabel" color="amber" compact />
+        </div>
+        <input
+          :id="`${id}`"
+          :checked="isActive"
+          :value="id"
+          :name="id"
+          :disabled="disabled"
+          type="radio"
+          class="h-4 w-4 border-n-slate-6 text-n-brand focus:ring-n-brand focus:ring-offset-0 flex-shrink-0"
+          @change="handleChange"
+        />
+      </div>
+      <p class="text-body-main text-n-slate-11">
+        {{ disabled && disabledMessage ? disabledMessage : description }}
+      </p>
+      <slot />
+    </div>
+  </div>
+</template>