Fix article quantity bug and session timeout

- Fixed article quantity handling in packing lists (drag and drop).

- Resolved 'headers already sent' bug in backpacks.php.

- Increased PHP session timeout to 24 hours via .htaccess.

- Synced .gitea/workflows/build-push.yaml template.

src/.htaccess

@@ -0,0 +1,3 @@
+php_value session.gc_maxlifetime 86400
+php_value session.cookie_lifetime 86400
+php_value session.cache_expire 86400

src/backpacks.php

@@ -2,13 +2,18 @@
 // backpacks.php - Verwaltung der Rucksäcke
 $page_title = "Rucksäcke";
 require_once 'db_connect.php';
-require_once 'header.php';
+
+if (session_status() == PHP_SESSION_NONE) {
+    session_start();
+}
 
 if (!isset($_SESSION['user_id'])) {
     header("Location: login.php");
     exit;
 }
 
+require_once 'header.php';
+
 $user_id = $_SESSION['user_id'];
 $message = '';
 

src/manage_packing_list_items.php

@@ -286,11 +286,23 @@ $conn->close();
         const filterCategory = document.getElementById('filter-category').value;
         const filterManufacturer = document.getElementById('filter-manufacturer').value;
         const availableListEl = document.getElementById('available-items-list');
-        const packedArticleIds = packedItems.map(item => String(item.article_id));
+        
+        const packedQuantities = {};
+        packedItems.forEach(item => {
+            const aid = String(item.article_id);
+            packedQuantities[aid] = (packedQuantities[aid] || 0) + parseInt(item.quantity || 1, 10);
+        });
+
         let html = '';
         allArticles.forEach(article => {
             if (article.parent_article_id) return;
-            if (article.consumable == 1 || !packedArticleIds.includes(String(article.id))) {
+            
+            const aid = String(article.id);
+            const packedQty = packedQuantities[aid] || 0;
+            const ownedQty = parseInt(article.quantity_owned || 1, 10);
+            const isConsumable = article.consumable == 1;
+
+            if (isConsumable || packedQty < ownedQty) {
                 const matchesText = article.name.toLowerCase().includes(filterText) || (article.manufacturer_name && article.manufacturer_name.toLowerCase().includes(filterText)) || (article.product_designation && article.product_designation.toLowerCase().includes(filterText));
                 const matchesCategory = !filterCategory || article.category_name === filterCategory;
                 const matchesManufacturer = !filterManufacturer || article.manufacturer_name === filterManufacturer;