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/Features/Employees/Pages/SalarySpecification.cshtml.cs

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+using System.Text.Json;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using PlanTempus.Application.Features.Employees.Components;
+
+namespace PlanTempus.Application.Features.Employees.Pages;
+
+public class SalarySpecificationModel : PageModel
+{
+    private readonly IWebHostEnvironment _environment;
+
+    public SalarySpecificationModel(IWebHostEnvironment environment)
+    {
+        _environment = environment;
+    }
+
+    public SalarySpecificationDto? Specification { get; private set; }
+    public string EmployeeName { get; private set; } = "Emma Larsen";
+    public string EmployeeNumber { get; private set; } = "EMP-001";
+    public string Department { get; private set; } = "Frisør";
+    public string EmploymentType { get; private set; } = "Fuldtid (37 t/uge)";
+
+    public IActionResult OnGet(string period)
+    {
+        var specs = LoadSalarySpecifications();
+        Specification = specs.FirstOrDefault(s => s.PeriodKey == period);
+
+        if (Specification == null)
+        {
+            return NotFound();
+        }
+
+        return Page();
+    }
+
+    private List<SalarySpecificationDto> LoadSalarySpecifications()
+    {
+        var jsonPath = Path.Combine(_environment.ContentRootPath, "Features", "Employees", "Data", "salarySpecificationMock.json");
+        var json = System.IO.File.ReadAllText(jsonPath);
+        var root = JsonSerializer.Deserialize<SalarySpecificationRoot>(json, new JsonSerializerOptions
+        {
+            PropertyNameCaseInsensitive = true
+        });
+        return root?.Specifications ?? new List<SalarySpecificationDto>();
+    }
+}