UI styling improvements: dashboard headers and navigation

- Restore blue PageHeader on Dashboard (/app-components)
- Update homepage (/) with subtle header design without blue bar
- Add uniform PageHeader styling to application edit page
- Fix Rapporten link on homepage to point to /reports overview
- Improve header descriptions spacing for better readability

backend/src/domain/jiraAssetsPayload.ts

@@ -0,0 +1,121 @@
+// ==========================
+// API Payload Types
+// ==========================
+
+export interface AssetsPayload {
+  objectEntries: ObjectEntry[];
+}
+
+export interface ObjectEntry {
+  id: string | number;
+  objectKey: string;
+  label: string;
+  objectType: {
+    id: number;
+    name: string;
+  };
+  created: string;
+  updated: string;
+  hasAvatar: boolean;
+  timestamp: number;
+  attributes?: ObjectAttribute[];
+}
+
+export interface ObjectAttribute {
+  id: number;
+  objectTypeAttributeId: number;
+  objectAttributeValues: ObjectAttributeValue[];
+}
+
+// ==========================
+// Attribute Value Union
+// ==========================
+
+export type ObjectAttributeValue =
+  | SimpleValue
+  | StatusValue
+  | ConfluenceValue
+  | UserValue
+  | ReferenceValue;
+
+export interface SimpleValue {
+  value: string | number | boolean;
+  searchValue: string;
+  referencedType: false;
+  displayValue: string;
+}
+
+export interface StatusValue {
+  status: { id: number; name: string; category: number };
+  searchValue: string;
+  referencedType: boolean;
+  displayValue: string;
+}
+
+export interface ConfluenceValue {
+  confluencePage: { id: string; title: string; url: string };
+  searchValue: string;
+  referencedType: boolean;
+  displayValue: string;
+}
+
+export interface UserValue {
+  user: {
+    avatarUrl: string;
+    displayName: string;
+    name: string;
+    key: string;
+    renderedLink: string;
+    isDeleted: boolean;
+  };
+  searchValue: string;
+  referencedType: boolean;
+  displayValue: string;
+}
+
+export interface ReferenceValue {
+  referencedObject: ReferencedObject;
+  searchValue: string;
+  referencedType: true;
+  displayValue: string;
+}
+
+export interface ReferencedObject {
+  id: string | number;
+  objectKey: string;
+  label: string;
+  name?: string;
+  archived?: boolean;
+  objectType: {
+    id: number;
+    name: string;
+  };
+  created: string;
+  updated: string;
+  timestamp: number;
+  hasAvatar: boolean;
+  attributes?: ObjectAttribute[];
+  _links?: { self: string };
+}
+
+// ==========================
+// Type Guards (MANDATORY)
+// ==========================
+
+export function isReferenceValue(
+  v: ObjectAttributeValue
+): v is ReferenceValue {
+  return (v as ReferenceValue).referencedObject !== undefined;
+}
+
+export function isSimpleValue(
+  v: ObjectAttributeValue
+): v is SimpleValue {
+  return (v as SimpleValue).value !== undefined;
+}
+
+export function hasAttributes(
+  obj: ObjectEntry | ReferencedObject
+): obj is (ObjectEntry | ReferencedObject) & { attributes: ObjectAttribute[] } {
+  return Array.isArray((obj as any).attributes);
+}

backend/src/domain/syncPolicy.ts

@@ -0,0 +1,38 @@
+/**
+ * Sync Policy - Determines how objects are handled during sync
+ */
+
+export enum SyncPolicy {
+  /**
+   * Full sync: fetch all objects, cache all attributes
+   * Used for enabled object types in schema configuration
+   */
+  ENABLED = 'enabled',
+
+  /**
+   * Reference-only: cache minimal metadata for referenced objects
+   * Used for disabled object types that are referenced by enabled types
+   */
+  REFERENCE_ONLY = 'reference_only',
+
+  /**
+   * Skip: don't sync this object type at all
+   * Used for object types not in use
+   */
+  SKIP = 'skip',
+}
+
+/**
+ * Get sync policy for an object type
+ */
+export function getSyncPolicy(
+  typeName: string,
+  enabledTypes: Set<string>
+): SyncPolicy {
+  if (enabledTypes.has(typeName)) {
+    return SyncPolicy.ENABLED;
+  }
+  // We still need to cache referenced objects, even if their type is disabled
+  // This allows reference resolution without full sync
+  return SyncPolicy.REFERENCE_ONLY;
+}