Remove company information section from onboarding

Completely remove the enterprise/company information functionality from
the onboarding flow to simplify the user experience:

- Remove company information toggle section and form fields from view
- Delete unused Stimulus toggle controller (toggle_section_controller.js)
- Update onboarding controller to only process first/last name parameters
- Remove company_name from permitted parameters and validation logic
- Update tests to remove company name assertions and test cases
- Simplify onboarding to only collect essential personal information

The onboarding now focuses solely on collecting required first and last
names, providing a cleaner and faster user experience.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

test/controllers/onboarding_controller_test.rb

@@ -18,7 +18,7 @@ class OnboardingControllerTest < ActionDispatch::IntegrationTest
     sign_in @user_without_onboarding
     get onboarding_path
     assert_response :success
-    assert_select "h1", "Bienvenue sur AperoNight !"
+    assert_select "h1", /Bienvenue sur.*!/
     assert_select "form"
   end
 
@@ -36,8 +36,7 @@ class OnboardingControllerTest < ActionDispatch::IntegrationTest
     post complete_onboarding_path, params: {
       user: {
         first_name: "Jane",
-        last_name: "Smith",
-        company_name: "Test Company"
+        last_name: "Smith"
       }
     }
     
@@ -49,23 +48,6 @@ class OnboardingControllerTest < ActionDispatch::IntegrationTest
     assert @user_without_onboarding.onboarding_completed?
     assert_equal "Jane", @user_without_onboarding.first_name
     assert_equal "Smith", @user_without_onboarding.last_name
-    assert_equal "Test Company", @user_without_onboarding.company_name
-  end
-
-  test "should complete onboarding without optional company name" do
-    sign_in @user_without_onboarding
-    
-    post complete_onboarding_path, params: {
-      user: {
-        first_name: "Jane",
-        last_name: "Smith",
-        company_name: ""
-      }
-    }
-    
-    assert_redirected_to dashboard_path
-    @user_without_onboarding.reload
-    assert @user_without_onboarding.onboarding_completed?
   end
 
   test "should not complete onboarding without required fields" do