fix: Change debug VAT trigger from 12345 to GB123456789

- GB123456789 passes VAT validation (GB + 9 digits)
- Easy to remember: GB followed by numbers 1-9 in sequence
- Works with or without spaces (GB123456789 or GB 123 456 789)
- Updated DEBUG_FEATURES.md documentation
- Previous value '12345' failed validation checks

Author: FiftyEightSoftware

DEBUG_FEATURES.md

@@ -6,12 +6,14 @@ Features that are **only available in DEBUG builds** for testing and development
 
 ## 🔧 Data Seeding Shortcut
 
-### Magic VAT Number: `12345`
+### Magic VAT Number: `GB123456789`
 
-During onboarding in the mobile app (or web app running in DEBUG mode), entering `12345` as the VAT Registration Number will automatically trigger data seeding.
+During onboarding in the mobile app (or web app running in DEBUG mode), entering `GB123456789` as the VAT Registration Number will automatically trigger data seeding.
+
+**Easy to remember:** Just type `GB` followed by the numbers 1-9 in sequence!
 
 **How it works:**
-1. User enters `12345` in the VAT Registration Number field
+1. User enters `GB123456789` (or formatted as `GB 123 456 789`) in the VAT Registration Number field
 2. User clicks "Save & Continue"
 3. App calls `/api/dev/reseed` endpoint on the backend
 4. Test data is seeded (sample invoices, jobs, etc.)
@@ -52,7 +54,7 @@ BUILD_TYPE=debug BUILD_FORMAT=apk ./scripts/build_mobile_android.sh
 
 2. Launch app and complete onboarding
 
-3. Enter `12345` as VAT number
+3. Enter `GB123456789` as VAT number
 
 4. Click "Save & Continue"
 

ai_mate_blazor/Pages/Onboarding.razor

@@ -237,9 +237,10 @@
             return;
         }
 
-        // DEBUG ONLY: Check for magic VAT number "12345" to trigger data seeding
+        // DEBUG ONLY: Check for magic VAT number "GB123456789" to trigger data seeding
         #if DEBUG
-        if (VatRegistrationId?.Trim() == "12345")
+        var cleanedVat = VatRegistrationId?.Replace(" ", "").Replace("-", "").ToUpperInvariant();
+        if (cleanedVat == "GB123456789")
         {
             InfoMessage = "🔧 Debug mode: Triggering data seeding...";
             StateHasChanged();