chore: Improvements in pending FAQs (#12755)

# Pull Request Template

## Description

**This PR includes:**

1. Added URL-based filter persistence for the responses pages, including
page and search parameters.
2. Introduced a new empty state variant for pending FAQs — without a
backdrop and with a “Clear Filters” option.
3. Made the actions, filter, and search row remain fixed at the top
while scrolling.

Fixes
https://linear.app/chatwoot/issue/CW-5852/improvements-in-pending-faqs

## Type of change

- [x] New feature (non-breaking change which adds functionality)

## How Has This Been Tested?

### Loom video
https://www.loom.com/share/1d9eee68c0684f0ab05e08b4ca1e0ce9


## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [ ] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

app/javascript/dashboard/components-next/EmptyStateLayout.vue

@@ -14,6 +14,10 @@ defineProps({
     type: Array,
     default: () => [],
   },
+  showBackdrop: {
+    type: Boolean,
+    default: true,
+  },
 });
 </script>
 
@@ -25,14 +29,24 @@ defineProps({
       class="relative w-full max-w-[60rem] mx-auto overflow-hidden h-full max-h-[28rem]"
     >
       <div
+        v-if="showBackdrop"
         class="w-full h-full space-y-4 overflow-y-hidden opacity-50 pointer-events-none"
       >
         <slot name="empty-state-item" />
       </div>
       <div
-        class="absolute inset-x-0 bottom-0 flex flex-col items-center justify-end w-full h-full pb-20 bg-gradient-to-t from-n-background from-25% dark:from-n-background to-transparent"
+        class="flex flex-col items-center justify-end w-full h-full pb-20"
+        :class="{
+          'absolute inset-x-0 bottom-0 bg-gradient-to-t from-n-background from-25% dark:from-n-background to-transparent':
+            showBackdrop,
+        }"
       >
-        <div class="flex flex-col items-center justify-center gap-6">
+        <div
+          class="flex flex-col items-center justify-center gap-6"
+          :class="{
+            'mt-48': !showBackdrop,
+          }"
+        >
           <div class="flex flex-col items-center justify-center gap-3">
             <h2
               class="text-3xl font-medium text-center text-n-slate-12 font-interDisplay"
@@ -40,6 +54,7 @@ defineProps({
               {{ title }}
             </h2>
             <p
+              v-if="subtitle"
               class="max-w-xl text-base text-center text-n-slate-11 font-interDisplay tracking-[0.3px]"
             >
               {{ subtitle }}

app/javascript/dashboard/components-next/captain/PageLayout.vue

@@ -114,6 +114,7 @@ const handlePageChange = event => {
             <slot name="action" />
           </div>
         </div>
+        <slot name="subHeader" />
       </div>
     </header>
     <main class="flex-1 px-6 overflow-y-auto">

app/javascript/dashboard/components-next/captain/pageComponents/emptyStates/ResponsePageEmptyState.vue

@@ -6,16 +6,39 @@ import ResponseCard from 'dashboard/components-next/captain/assistant/ResponseCa
 import FeatureSpotlight from 'dashboard/components-next/feature-spotlight/FeatureSpotlight.vue';
 import { responsesList } from 'dashboard/components-next/captain/pageComponents/emptyStates/captainEmptyStateContent.js';
 
-const emit = defineEmits(['click']);
+import { computed } from 'vue';
+
+const props = defineProps({
+  variant: {
+    type: String,
+    default: 'approved',
+    validator: value => ['approved', 'pending'].includes(value),
+  },
+  hasActiveFilters: {
+    type: Boolean,
+    default: false,
+  },
+});
+
+const emit = defineEmits(['click', 'clearFilters']);
+
+const isApproved = computed(() => props.variant === 'approved');
+const isPending = computed(() => props.variant === 'pending');
+
 const { isOnChatwootCloud } = useAccount();
 
 const onClick = () => {
   emit('click');
 };
+
+const onClearFilters = () => {
+  emit('clearFilters');
+};
 </script>
 
 <template>
   <FeatureSpotlight
+    v-if="isApproved"
     :title="$t('CAPTAIN.RESPONSES.EMPTY_STATE.FEATURE_SPOTLIGHT.TITLE')"
     :note="$t('CAPTAIN.RESPONSES.EMPTY_STATE.FEATURE_SPOTLIGHT.NOTE')"
     fallback-thumbnail="/assets/images/dashboard/captain/faqs-light.svg"
@@ -25,11 +48,16 @@ const onClick = () => {
     class="mb-8"
   />
   <EmptyStateLayout
-    :title="$t('CAPTAIN.RESPONSES.EMPTY_STATE.TITLE')"
-    :subtitle="$t('CAPTAIN.RESPONSES.EMPTY_STATE.SUBTITLE')"
+    :title="
+      isPending
+        ? $t('CAPTAIN.RESPONSES.EMPTY_STATE.NO_PENDING_TITLE')
+        : $t('CAPTAIN.RESPONSES.EMPTY_STATE.TITLE')
+    "
+    :subtitle="isApproved ? $t('CAPTAIN.RESPONSES.EMPTY_STATE.SUBTITLE') : ''"
     :action-perms="['administrator']"
+    :show-backdrop="isApproved"
   >
-    <template #empty-state-item>
+    <template v-if="isApproved" #empty-state-item>
       <div class="grid grid-cols-1 gap-4 p-px overflow-hidden">
         <ResponseCard
           v-for="(response, index) in responsesList.slice(0, 5)"
@@ -45,11 +73,21 @@ const onClick = () => {
       </div>
     </template>
     <template #actions>
-      <Button
-        :label="$t('CAPTAIN.RESPONSES.ADD_NEW')"
-        icon="i-lucide-plus"
-        @click="onClick"
-      />
+      <div class="flex flex-col items-center gap-3">
+        <Button
+          v-if="isApproved"
+          :label="$t('CAPTAIN.RESPONSES.ADD_NEW')"
+          icon="i-lucide-plus"
+          @click="onClick"
+        />
+        <Button
+          v-else-if="isPending && hasActiveFilters"
+          :label="$t('CAPTAIN.RESPONSES.EMPTY_STATE.CLEAR_SEARCH')"
+          variant="link"
+          size="sm"
+          @click="onClearFilters"
+        />
+      </div>
     </template>
   </EmptyStateLayout>
 </template>