Fixed code splitting by refactoring index files

[witoszekdev]

This PR resolves Vite warning during build:

#56 354.4 [warn] [plugin vite:reporter] 
#56 354.4 (!) /app/src/auth/index.tsx is dynamically imported by /app/src/index.tsx but also statically imported by /app/src/attributes/components/AttributePage/AttributePage.tsx, /app/src/auth/AuthProvider.tsx, /app/src/auth/components/Layout.tsx, /app/src/auth/components/LoginPage/LoginPage.tsx, /app/src/auth/components/SectionRoute.tsx, /app/src/auth/hooks/useAuthRedirection.ts, /app/src/auth/hooks/useUserAccessibleChannels.ts, /app/src/auth/hooks/useUserPermissions.ts, /app/src/auth/views/Login.tsx, /app/src/categories/components/CategoryUpdatePage/CategoryUpdatePage.tsx, /app/src/channels/views/ChannelCreate/useSaveChannel.ts, /app/src/collections/components/CollectionDetailsPage/CollectionDetailsPage.tsx, /app/src/components/AccountPermissions/AccountPermissions.tsx, /app/src/components/AppLayout/AppChannelContext.tsx, /app/src/components/AppLayout/TopNav/Root.tsx, /app/src/components/Datagrid/persistance/useMetadata.ts, /app/src/components/Shop/index.tsx, /app/src/components/Sidebar/menu/hooks/useMenuS
#56 354.4 
#56 354.4 [warn] [plugin vite:reporter] 
#56 354.4 (!) /app/src/configuration/index.tsx is dynamically imported by /app/src/index.tsx but also statically imported by /app/src/attributes/components/AttributeListPage/AttributeListPage.tsx, /app/src/channels/pages/ChannelsListPage/ChannelsListPage.tsx, /app/src/components/Sidebar/menu/hooks/useMenuStructure.tsx, /app/src/configuration/utils.ts, /app/src/permissionGroups/components/PermissionGroupListPage/PermissionGroupListPage.tsx, /app/src/productTypes/components/ProductTypeListPage/ProductTypeListPage.tsx, /app/src/refundsSettings/components/RefundsSettingsPage/RefundsSettingsPage.tsx, /app/src/shipping/components/ShippingZonesListPage/ShippingZonesListPage.tsx, /app/src/siteSettings/components/SiteSettingsPage/SiteSettingsPage.tsx, /app/src/staff/components/StaffListPage/StaffListPage.tsx, /app/src/taxes/pages/TaxChannelsPage/TaxChannelsPage.tsx, /app/src/taxes/pages/TaxClassesPage/TaxClassesPage.tsx, /app/src/taxes/pages/TaxCountriesPage/TaxCountriesPage.tsx, /app/src/warehouses/components/Warehou
#56 354.4 

It means that some domain-level index.tsx had code that could only be loaded from index.ts.

Because we are using dynamic imports for main app index.ts (e.g. importing configuration/index.tsx), this caused entire auth and configuration modules to be included in the main bundle.

[changeset-bot]

🦋 Changeset detected

Latest commit: a6acc7f

The changes in this PR will be included in the next version bump.

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[codecov]

Codecov Report

❌ Patch coverage is 96.61017% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 42.58%. Comparing base (b5d86ff) to head (a6acc7f).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/configuration/createConfigurationMenu.tsx	91.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6333      +/-   ##
==========================================
- Coverage   42.79%   42.58%   -0.21%     
==========================================
  Files        2497     2495       -2     
  Lines       43406    43305     -101     
  Branches    10232    10249      +17     
==========================================
- Hits        18574    18442     -132     
+ Misses      24795    23547    -1248     
- Partials       37     1316    +1279     

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