fix: hide linear card when not enabled (#12918)

The Linear card now only appears in conversation sidebar when:

- The linear_integration feature flag is enabled for the account
- LINEAR_CLIENT_ID is configured (inferred from the integration existing
in the store)

This matches the backend behavior: if LINEAR_CLIENT_ID is not set, the
integration is filtered out of the API response, so it won't exist in
the store.

In addition, I discovered that Settings/Integrations page showed Linear
card even if it was disabled but Linear client_id set. Now the Linear
card shows only if both conditions are met.

Fixes #12909 

## How Has This Been Tested?

#### Before


https://github.com/user-attachments/assets/cd21b881-5332-48f8-b230-662abc256ba2


#### After



https://github.com/user-attachments/assets/d794cc2e-19d6-4545-b2ef-3af054c2ac81



---------

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

app/javascript/dashboard/routes/dashboard/conversation/ContactPanel.vue

@@ -5,7 +5,9 @@ import {
   useFunctionGetter,
   useStore,
 } from 'dashboard/composables/store';
+import { useAccount } from 'dashboard/composables/useAccount';
 import { useUISettings } from 'dashboard/composables/useUISettings';
+import { FEATURE_FLAGS } from 'dashboard/featureFlags';
 
 import AccordionItem from 'dashboard/components/Accordion/AccordionItem.vue';
 import ContactConversations from './ContactConversations.vue';
@@ -52,12 +54,22 @@ const isShopifyFeatureEnabled = computed(
   () => shopifyIntegration.value.enabled
 );
 
+const { isCloudFeatureEnabled } = useAccount();
+
+const isLinearFeatureEnabled = computed(() =>
+  isCloudFeatureEnabled(FEATURE_FLAGS.LINEAR)
+);
+
 const linearIntegration = useFunctionGetter(
   'integrations/getIntegration',
   'linear'
 );
 
-const isLinearIntegrationEnabled = computed(
+const isLinearClientIdConfigured = computed(() => {
+  return !!linearIntegration.value?.id;
+});
+
+const isLinearConnected = computed(
   () => linearIntegration.value?.enabled || false
 );
 
@@ -238,7 +250,13 @@ onMounted(() => {
               <MacrosList :conversation-id="conversationId" />
             </AccordionItem>
           </woot-feature-toggle>
-          <div v-else-if="element.name === 'linear_issues'">
+          <div
+            v-else-if="
+              element.name === 'linear_issues' &&
+              isLinearFeatureEnabled &&
+              isLinearClientIdConfigured
+            "
+          >
             <AccordionItem
               :title="$t('CONVERSATION_SIDEBAR.ACCORDION.LINEAR_ISSUES')"
               :is-open="isContactSidebarItemOpen('is_linear_issues_open')"
@@ -247,7 +265,7 @@ onMounted(() => {
                 value => toggleSidebarUIState('is_linear_issues_open', value)
               "
             >
-              <LinearSetupCTA v-if="!isLinearIntegrationEnabled" />
+              <LinearSetupCTA v-if="!isLinearConnected" />
               <LinearIssuesList v-else :conversation-id="conversationId" />
             </AccordionItem>
           </div>