fix: Revoke Linear OAuth token when integration is deleted (#11838)

When users delete the Linear integration from their Chatwoot dashboard,
the access token remains valid in Linear's system. This causes the
integration to still appear as connected in Linear's UI, even though
it's been removed from Chatwoot. Users need to manually disconnect from
Linear's side to fully remove the integration.


https://www.loom.com/share/5c102cbdf02e49bcb7a6fa6d409b531a?sid=0c664250-c867-4fc8-b44d-e1c1165337a7

lib/linear.rb

@@ -1,5 +1,6 @@
 class Linear
   BASE_URL = 'https://api.linear.app/graphql'.freeze
+  REVOKE_URL = 'https://api.linear.app/oauth/revoke'.freeze
   PRIORITY_LEVELS = (0..4).to_a
 
   def initialize(access_token)
@@ -86,6 +87,14 @@ class Linear
     process_response(response)
   end
 
+  def revoke_token
+    response = HTTParty.post(
+      REVOKE_URL,
+      headers: { 'Authorization' => "Bearer #{@access_token}", 'Content-Type' => 'application/json' }
+    )
+    response.success?
+  end
+
   private
 
   def validate_team_and_title(params)