Add collapsible sections to Ivanti Queue page

Group queue items into a hybrid layout: Inventory section (CARD/GRANITE/DECOM)
at top, then vendor-grouped sections for FP/Archer items sorted alphabetically.
Each section header is clickable to collapse/expand with chevron indicators.

- Extract grouping logic into reusable utility (queueGrouping.js)
- Add collapse state management (all sections expanded by default)
- Preserve cross-section multi-select, floating action bar, ticket badges
- Add 5 property-based tests covering grouping correctness, ordering,
  empty section omission, count accuracy, and selection independence

frontend/src/__tests__/queue-grouping-ordering.property.test.js

@@ -0,0 +1,92 @@
+/**
+ * Property-Based Test: Section Ordering
+ *
+ * Feature: queue-collapsible-sections, Property 2: Section Ordering
+ * **Validates: Requirements 1.3, 1.4**
+ *
+ * For any array of queue items, the Inventory section (if present) is always
+ * the first element, and all vendor sections are sorted alphabetically by label.
+ */
+import fc from 'fast-check';
+
+// Inline grouping logic (mirrors the implementation in IvantiTodoQueuePage)
+function groupQueueItems(visibleItems) {
+  const INVENTORY_TYPES = new Set(['CARD', 'GRANITE', 'DECOM']);
+  const inventoryItems = [];
+  const vendorMap = new Map();
+  for (const item of visibleItems) {
+    if (INVENTORY_TYPES.has(item.workflow_type)) {
+      inventoryItems.push(item);
+    } else {
+      const vendor = item.vendor?.trim() || 'Unknown';
+      if (!vendorMap.has(vendor)) vendorMap.set(vendor, []);
+      vendorMap.get(vendor).push(item);
+    }
+  }
+  const sections = [];
+  if (inventoryItems.length > 0) {
+    sections.push({ key: 'inventory', label: 'Inventory', type: 'inventory', items: inventoryItems });
+  }
+  const sortedVendors = [...vendorMap.entries()].sort((a, b) => a[0].localeCompare(b[0]));
+  for (const [vendor, items] of sortedVendors) {
+    sections.push({ key: `vendor:${vendor}`, label: vendor, type: 'vendor', items });
+  }
+  return sections;
+}
+
+// Generator for queue items with random workflow types and vendors
+const workflowTypeArb = fc.constantFrom('CARD', 'GRANITE', 'DECOM', 'FP', 'Archer');
+
+const vendorArb = fc.oneof(
+  fc.constant(null),
+  fc.constant(undefined),
+  fc.constant(''),
+  fc.constant('  '),
+  fc.stringMatching(/^[A-Za-z][A-Za-z0-9 ]{0,14}$/)
+);
+
+const queueItemArb = fc.record({
+  id: fc.integer({ min: 1, max: 100000 }),
+  workflow_type: workflowTypeArb,
+  vendor: vendorArb,
+  hostname: fc.string({ minLength: 1, maxLength: 20 }),
+  status: fc.constant('pending'),
+});
+
+const queueItemsArb = fc.array(queueItemArb, { minLength: 0, maxLength: 50 });
+
+describe('Queue Grouping — Property 2: Section Ordering', () => {
+  it('Inventory section (if present) is always the first element', () => {
+    fc.assert(
+      fc.property(queueItemsArb, (items) => {
+        const sections = groupQueueItems(items);
+
+        const inventoryIndex = sections.findIndex(s => s.type === 'inventory');
+
+        // If inventory section exists, it must be at index 0
+        if (inventoryIndex !== -1) {
+          expect(inventoryIndex).toBe(0);
+        }
+      }),
+      { numRuns: 500 }
+    );
+  });
+
+  it('Vendor sections are sorted alphabetically by label', () => {
+    fc.assert(
+      fc.property(queueItemsArb, (items) => {
+        const sections = groupQueueItems(items);
+
+        const vendorSections = sections.filter(s => s.type === 'vendor');
+
+        // Each consecutive pair of vendor sections must be in alphabetical order
+        for (let i = 1; i < vendorSections.length; i++) {
+          const prev = vendorSections[i - 1].label;
+          const curr = vendorSections[i].label;
+          expect(prev.localeCompare(curr)).toBeLessThanOrEqual(0);
+        }
+      }),
+      { numRuns: 500 }
+    );
+  });
+});