feat: add Pricing & Units tab for Level error monitoring

New tab shows all products with missing UVP/SRP pricing or invalid
container units (40'HC/HQ = 0 or 1, missing Units/Outer). Price
fields are inline-editable with Supabase sync. Columns are detected
dynamically from Excel headers so future SRP countries (e.g. Poland)
appear automatically.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/App.tsx

@@ -10,6 +10,7 @@ import { getAllSyncedRows, saveRowToSupabase } from './lib/supabase';
 import { getStoredSession, signOut, type AuthSession } from './lib/auth';
 import { LoginPage } from './components/LoginPage';
 import { DimensionsView } from './components/DimensionsView';
+import { PricingView } from './components/PricingView';
 import { UndoToast } from './components/UndoToast';
 
 export default function App() {
@@ -31,7 +32,7 @@ export default function App() {
     fileDate: null,
     hasUnsavedChanges: false
   });
-  const [activeModule, setActiveModule] = useState<'descriptions' | 'matrix' | 'dimensions'>('descriptions');
+  const [activeModule, setActiveModule] = useState<'descriptions' | 'matrix' | 'dimensions' | 'pricing'>('descriptions');
   const [undoHistory, setUndoHistory] = useState<{ data: ExcelRow[], message: string }[]>([]);
   const [editingRowIndex, setEditingRowIndex] = useState<number | null>(null);
   const [isLoadingDefault, setIsLoadingDefault] = useState(true);
@@ -354,14 +355,24 @@ export default function App() {
               )}
 
               {activeModule === 'dimensions' && (
-                <DimensionsView 
-                  data={appState.data} 
+                <DimensionsView
+                  data={appState.data}
                   headers={appState.headers}
                   onEdit={(index) => setEditingRowIndex(index)}
                   onSaveRow={handleSaveRow}
                   onCaptureState={captureState}
                 />
               )}
+
+              {activeModule === 'pricing' && (
+                <PricingView
+                  data={appState.data}
+                  headers={appState.headers}
+                  onSaveRow={handleSaveRow}
+                  onCaptureState={captureState}
+                  onEdit={(index) => setEditingRowIndex(index)}
+                />
+              )}
             </>
           )}
         </main>