feat: Add sidebar unread counts for filters (CW-7262) (#14726)

## Description

Extends the conversation unread-count system so the left sidebar can
show unread badges for Mentions, Participating, Unattended, and saved
conversation folders. Folder badges reuse the existing `custom_filters`
conversation filter semantics, store user-scoped Redis sets lazily, and
skip unsupported folder filters so invalid saved folders continue to
render without a badge. The Unattended badge counts all visible unread
open conversations that match the existing unattended conversation
scope.

Closes
-
[CW-7262](https://linear.app/chatwoot/issue/CW-7262/unread-counts-for-filters-folders)

## What changed

- Added user-scoped unread-count Redis keys and cache builders for
mentions, participating conversations, unattended conversations, and
saved folder filters.
- Reused `Conversations::FilterService` through a relation-returning
path so folder counts match the folder conversation list behavior.
- Invalidated user filter caches from mention, participant,
custom-filter, and relevant conversation update events.
- Extended the unread-count endpoint payload and sidebar Vuex/sidebar
rendering for the new badge counts, including the Unattended sidebar
item.
- Added Ruby, Enterprise, request, listener, and frontend store coverage
for the new unread-count dimensions.

## Type of change

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

## How Has This Been Tested?

- Created local validation folders for `john@acme.inc` and confirmed the
unread-count payload includes open, resolved, and high-priority folder
badges while excluding the invalid unsupported folder.
- Added coverage for the Unattended badge rule: all visible unread open
conversations matching `Conversation.unattended`.
- Ran focused unread-count Ruby specs, including service, listener,
request, and Enterprise counter coverage.
- Ran frontend unread-count store specs.
- Ran RuboCop on the touched Ruby files.
- Ran ESLint through the project script; it completed with warnings in
existing unrelated files and no errors.

<img width="369" height="525" alt="Screenshot 2026-06-13 at 10 51 39 PM"
src="https://github.com/user-attachments/assets/36b1d2c4-dac1-4f6f-9c0e-7ef5a6cc2975"
/>

## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] I have commented on my code, particularly in hard-to-understand
areas
- [x] Documentation changes are not required for this internal
unread-count behavior
- [x] My changes generate no new warnings
- [x] 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
- [x] No dependent downstream changes are required

---------

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

app/javascript/dashboard/components-next/sidebar/Sidebar.vue

@@ -199,6 +199,18 @@ const getLabelUnreadCount = useMapGetter(
 const getTeamUnreadCount = useMapGetter(
   'conversationUnreadCounts/getTeamUnreadCount'
 );
+const mentionsUnreadCount = useMapGetter(
+  'conversationUnreadCounts/getMentionsUnreadCount'
+);
+const participatingUnreadCount = useMapGetter(
+  'conversationUnreadCounts/getParticipatingUnreadCount'
+);
+const unattendedUnreadCount = useMapGetter(
+  'conversationUnreadCounts/getUnattendedUnreadCount'
+);
+const getFolderUnreadCount = useMapGetter(
+  'conversationUnreadCounts/getFolderUnreadCount'
+);
 const teams = useMapGetter('teams/getMyTeams');
 const contactCustomViews = useMapGetter('customViews/getContactCustomViews');
 const conversationCustomViews = useMapGetter(
@@ -280,6 +292,19 @@ const sortedLabels = computed(() =>
   })
 );
 
+const unreadBadgeTooltips = computed(() => ({
+  ALL: t('SIDEBAR.UNREAD_COUNT_TOOLTIP.ALL'),
+  INBOX: t('SIDEBAR.UNREAD_COUNT_TOOLTIP.INBOX'),
+  LABEL: t('SIDEBAR.UNREAD_COUNT_TOOLTIP.LABEL'),
+  TEAM: t('SIDEBAR.UNREAD_COUNT_TOOLTIP.TEAM'),
+  FOLDER: t('SIDEBAR.UNREAD_COUNT_TOOLTIP.FOLDER'),
+  MENTIONS: t('SIDEBAR.UNREAD_COUNT_TOOLTIP.MENTIONS'),
+  PARTICIPATING: t('SIDEBAR.UNREAD_COUNT_TOOLTIP.PARTICIPATING'),
+  UNATTENDED: t('SIDEBAR.UNREAD_COUNT_TOOLTIP.UNATTENDED'),
+}));
+
+const unreadBadgeTooltip = type => unreadBadgeTooltips.value[type];
+
 const closeMobileSidebar = () => {
   if (!props.isMobileSidebarOpen) return;
   emit('closeMobileSidebar');
@@ -335,12 +360,15 @@ const menuItems = computed(() => {
           label: t('SIDEBAR.ALL_CONVERSATIONS'),
           icon: 'i-lucide-inbox',
           badgeCount: allUnreadCount.value,
+          badgeTooltip: unreadBadgeTooltip('ALL'),
           activeOn: ['inbox_conversation'],
           to: accountScopedRoute('home'),
         },
         {
           name: 'Mentions',
           label: t('SIDEBAR.MENTIONED_CONVERSATIONS'),
+          badgeCount: mentionsUnreadCount.value,
+          badgeTooltip: unreadBadgeTooltip('MENTIONS'),
           icon: 'i-lucide-at-sign',
           activeOn: ['conversation_through_mentions'],
           to: accountScopedRoute('conversation_mentions'),
@@ -348,6 +376,8 @@ const menuItems = computed(() => {
         {
           name: 'Participating',
           label: t('SIDEBAR.PARTICIPATING_CONVERSATIONS'),
+          badgeCount: participatingUnreadCount.value,
+          badgeTooltip: unreadBadgeTooltip('PARTICIPATING'),
           icon: 'i-lucide-user-round-check',
           activeOn: ['conversation_through_participating'],
           to: accountScopedRoute('conversation_participating'),
@@ -355,6 +385,8 @@ const menuItems = computed(() => {
         {
           name: 'Unattended',
           activeOn: ['conversation_through_unattended'],
+          badgeCount: unattendedUnreadCount.value,
+          badgeTooltip: unreadBadgeTooltip('UNATTENDED'),
           label: t('SIDEBAR.UNATTENDED_CONVERSATIONS'),
           icon: 'i-lucide-clock-alert',
           to: accountScopedRoute('conversation_unattended'),
@@ -370,6 +402,8 @@ const menuItems = computed(() => {
           children: sortedFolders.value.map(view => ({
             name: `${view.name}-${view.id}`,
             label: view.name,
+            badgeCount: getFolderUnreadCount.value(view.id),
+            badgeTooltip: unreadBadgeTooltip('FOLDER'),
             to: accountScopedRoute('folder_conversations', { id: view.id }),
           })),
         },
@@ -385,6 +419,7 @@ const menuItems = computed(() => {
             name: `${team.name}-${team.id}`,
             label: team.name,
             badgeCount: getTeamUnreadCount.value(team.id),
+            badgeTooltip: unreadBadgeTooltip('TEAM'),
             to: accountScopedRoute('team_conversations', { teamId: team.id }),
           })),
         },
@@ -400,6 +435,7 @@ const menuItems = computed(() => {
             name: `${inbox.name}-${inbox.id}`,
             label: inbox.name,
             badgeCount: getInboxUnreadCount.value(inbox.id),
+            badgeTooltip: unreadBadgeTooltip('INBOX'),
             icon: h(ChannelIcon, { inbox, class: 'size-[16px]' }),
             to: accountScopedRoute('inbox_dashboard', { inbox_id: inbox.id }),
             component: leafProps =>
@@ -408,6 +444,7 @@ const menuItems = computed(() => {
                 active: leafProps.active,
                 inbox,
                 badgeCount: leafProps.badgeCount,
+                badgeTooltip: leafProps.badgeTooltip,
               }),
           })),
         },
@@ -423,6 +460,7 @@ const menuItems = computed(() => {
             name: `${label.title}-${label.id}`,
             label: label.title,
             badgeCount: getLabelUnreadCount.value(label.id),
+            badgeTooltip: unreadBadgeTooltip('LABEL'),
             icon: h('span', {
               class: `size-[8px] rounded-sm`,
               style: { backgroundColor: label.color },