Adds salary specifications with detailed accordion view

Introduces new salary specification feature with interactive accordion component

Implements detailed salary breakdown including:
- Salary specification JSON data model
- Salary specification page with printable view
- Accordion component for expanding/collapsing salary details
- Localization support for new salary labels

Enhances employee salary transparency and detail presentation

PlanTempus.Application/wwwroot/css/COMPONENT-CATALOG.md

@@ -572,6 +572,50 @@ Dashed border knap til tilføjelse af elementer.
 
 ---
 
+## Accordion (accordion.css)
+
+Genbrugeligt accordion component med expand/collapse animation og single-open behavior.
+
+```html
+<swp-accordion>
+    <swp-accordion-item>
+        <swp-accordion-header>
+            <swp-accordion-info>
+                <swp-accordion-title>Titel</swp-accordion-title>
+                <swp-accordion-meta>Subtitle</swp-accordion-meta>
+            </swp-accordion-info>
+            <swp-accordion-summary>
+                <swp-summary-item>
+                    <swp-summary-value>1.234 kr</swp-summary-value>
+                    <swp-summary-label>Label</swp-summary-label>
+                </swp-summary-item>
+                <swp-accordion-toggle>
+                    <i class="ph ph-caret-down"></i>
+                </swp-accordion-toggle>
+            </swp-accordion-summary>
+        </swp-accordion-header>
+        <swp-accordion-content>
+            <!-- Content shown when expanded -->
+        </swp-accordion-content>
+    </swp-accordion-item>
+</swp-accordion>
+```
+
+**Features:**
+- Single-open behavior (kun en udvidet ad gangen)
+- Smooth expand/collapse animation (250ms/200ms)
+- Caret icon roterer 180 ved expand
+- Config row (`swp-config-row`) til key-value info
+
+**TypeScript:**
+```typescript
+import { Accordion } from './modules/accordion';
+
+const accordion = new Accordion('#my-accordion', { singleOpen: true });
+```
+
+---
+
 ## Fil Reference
 
 | Fil | Indhold |
@@ -582,7 +626,8 @@ Dashed border knap til tilføjelse af elementer.
 | `components.css` | Buttons, badges, cards, section-label, add-button, avatars, icon-btn, **swp-data-table** |
 | `stats.css` | Stat cards, stat rows |
 | `tabs.css` | Tab bar, tab content |
-| `employees.css` | User info, edit forms, document lists, context styles (.employees-list, .salary-history, .stats-bookings) |
+| `accordion.css` | Accordion component (swp-accordion, swp-accordion-item, expand/collapse) |
+| `employees.css` | User info, edit forms, document lists, context styles (.employees-list, .salary-history, .salary-specifications, .stats-bookings) |
 | `account.css` | Account/billing styles, context styles (.invoice-history) |
 | `bookings.css` | Booking list items |
 | `notifications.css` | Notification items |