feat: enhance item configuration with subitem handling and cleanup

frontend/src/lib/api/dashboard/a76/items.ts

@@ -105,8 +105,7 @@ export interface FaLineItem {
     
 	// Subitems
 	is_subitem?: boolean;
-	contains_subitems?: boolean;
-	includes_subitems?: boolean;
+	contains_subitems?: boolean;	
 	subitem_number?: number;
 
     // Special flags

frontend/src/lib/components/dashboard/invoices/edit/items/fa/item-configuration.svelte

@@ -35,6 +35,13 @@
         lineItem.fa_data.contains_subitems = val === 'si';
     }
 
+    // Helper for subitem_number binding
+    let subitemNumber = $derived.by(() => lineItem.fa_data?.subitem_number ?? 0);
+    function setSubitemNumber(val: number) {
+        if (!lineItem.fa_data) lineItem.fa_data = {};
+        lineItem.fa_data.subitem_number = val;
+    }
+
 	function handlePartSelect(part: any) {
 		lineItem.part_number = part.id;
 		// Store part number for display
@@ -65,23 +72,36 @@
 				</div>
 			</RadioGroup.Root>
 		</fieldset>
-		
-		<fieldset class="border rounded-md p-2 space-y-2">
-			<legend class="text-xs font-semibold px-2 bg-zinc-200 dark:bg-zinc-700">Contains Sub-Items</legend>
-			<RadioGroup.Root 
-                value={containsSubPartidasValue} 
-                onValueChange={setContinueSubPartidas}
-                class="flex gap-3">
-				<div class="flex items-center space-x-2">
-					<RadioGroup.Item value="si" id="continue_si" />
-					<Label for="continue_si" class="text-xs font-normal">Yes</Label>
-				</div>
-				<div class="flex items-center space-x-2">
-					<RadioGroup.Item value="no" id="continue_no" />
-					<Label for="continue_no" class="text-xs font-normal">No</Label>
-				</div>
-			</RadioGroup.Root>
-		</fieldset>
+		{#if isSubPartidaValue === 'partida'}
+			<fieldset class="border rounded-md p-2 space-y-2">
+				<legend class="text-xs font-semibold px-2 bg-zinc-200 dark:bg-zinc-700">Contains Sub-Items</legend>
+				<RadioGroup.Root 
+					value={containsSubPartidasValue} 
+					onValueChange={setContinueSubPartidas}
+					class="flex gap-3">
+					<div class="flex items-center space-x-2">
+						<RadioGroup.Item value="si" id="continue_si" />
+						<Label for="continue_si" class="text-xs font-normal">Yes</Label>
+					</div>
+					<div class="flex items-center space-x-2">
+						<RadioGroup.Item value="no" id="continue_no" />
+						<Label for="continue_no" class="text-xs font-normal">No</Label>
+					</div>
+				</RadioGroup.Root>
+			</fieldset>
+		{:else if isSubPartidaValue === 'subpartida'}
+			<fieldset class="border rounded-md p-1">
+				<legend class="text-xs font-semibold px-2 bg-zinc-200 dark:bg-zinc-700">Main Item Number</legend>
+				<Input 
+					id="subitem_number" 
+					type="number" 
+					value={subitemNumber}
+					oninput={(e) => setSubitemNumber(e.currentTarget.valueAsNumber || 0)}
+					class="h-7 text-xs" 
+					placeholder="Enter main item number"
+				/>
+			</fieldset>			
+		{/if}		
 	</div>
 
 	<!-- Descriptions -->

frontend/src/lib/components/dashboard/invoices/edit/items/fa/main-data.svelte

@@ -233,10 +233,7 @@
 				>
 					<Folder class="w-4 h-4" />
 				</Button>
-			</div>
-			{#if (customs as any).origin_country_name}
-				<p class="text-xs text-muted-foreground truncate">{(customs as any).origin_country_name}</p>
-			{/if}
+			</div>		
 		</div>
 
 		<div class="flex items-end gap-6">