feat: Add support for minutes in auto resolve feature (#11269)

### Summary

- Converts conversation auto-resolution duration from days to minutes
for more
granular control
- Updates validation to allow values from 10 minutes (minimum) to 999
days (maximum)
- Implements smart messaging to show appropriate time units in activity
messages

###  Changes

- Created migration to convert existing durations from days to minutes
(x1440)
- Updated conversation resolver to use minutes instead of days
- Added dynamic translation key selection based on duration value
- Updated related specs and documentation
- Added support for displaying durations in days, hours, or minutes
based on value

###  Test plan

- Verify account validation accepts new minute-based ranges
- Confirm existing account settings are correctly migrated
- Test auto-resolution works properly with minute values
- Ensure proper time unit display in activity messages

---------

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

spec/controllers/api/v1/accounts_controller_spec.rb

@@ -119,7 +119,7 @@ RSpec.describe 'Accounts API', type: :request do
 
     context 'when it is an authenticated user' do
       it 'shows an account' do
-        account.update(auto_resolve_duration: 30)
+        account.update(name: 'new name')
 
         get "/api/v1/accounts/#{account.id}",
             headers: admin.create_new_auth_token,
@@ -130,7 +130,6 @@ RSpec.describe 'Accounts API', type: :request do
         expect(response.body).to include(account.locale)
         expect(response.body).to include(account.domain)
         expect(response.body).to include(account.support_email)
-        expect(response.body).to include(account.auto_resolve_duration.to_s)
         expect(response.body).to include(account.locale)
       end
     end
@@ -189,7 +188,8 @@ RSpec.describe 'Accounts API', type: :request do
         locale: 'en',
         domain: 'example.com',
         support_email: 'care@example.com',
-        auto_resolve_duration: 40,
+        auto_resolve_after: 40,
+        auto_resolve_message: 'Auto resolved',
         timezone: 'Asia/Kolkata',
         industry: 'Technology',
         company_size: '1-10'
@@ -206,7 +206,10 @@ RSpec.describe 'Accounts API', type: :request do
         expect(account.reload.locale).to eq(params[:locale])
         expect(account.reload.domain).to eq(params[:domain])
         expect(account.reload.support_email).to eq(params[:support_email])
-        expect(account.reload.auto_resolve_duration).to eq(params[:auto_resolve_duration])
+
+        %w[auto_resolve_after auto_resolve_message].each do |attribute|
+          expect(account.reload.settings[attribute]).to eq(params[attribute.to_sym])
+        end
 
         %w[timezone industry company_size].each do |attribute|
           expect(account.reload.custom_attributes[attribute]).to eq(params[attribute.to_sym])