Adds suppliers feature to application

Introduces comprehensive suppliers management with mock data, localization, and UI components

Implements:
- Suppliers page with data table
- Localization for Danish and English
- Search and filtering functionality
- Responsive table design
- Mock data for initial population

PlanTempus.Application/Features/Suppliers/Components/SupplierRow/Default.cshtml

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+@model PlanTempus.Application.Features.Suppliers.Components.SupplierItemViewModel
+
+<swp-data-table-row data-name="@Model.Name" data-contact="@Model.ContactPerson" data-city="@Model.City" data-href="/leverandoerer/@Model.Id">
+    <swp-data-table-cell>
+        <swp-supplier-cell>
+            <swp-supplier-name>@Model.Name</swp-supplier-name>
+            <swp-supplier-city>@Model.City</swp-supplier-city>
+        </swp-supplier-cell>
+    </swp-data-table-cell>
+    <swp-data-table-cell>@Model.ContactPerson</swp-data-table-cell>
+    <swp-data-table-cell>@Model.ProductCount</swp-data-table-cell>
+    <swp-data-table-cell>@Model.LastOrderDate</swp-data-table-cell>
+    <swp-data-table-cell>
+        <swp-status-badge class="@Model.StatusClass">@Model.StatusText</swp-status-badge>
+    </swp-data-table-cell>
+</swp-data-table-row>

PlanTempus.Application/Features/Suppliers/Components/SupplierRow/SupplierRowViewComponent.cs

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+using Microsoft.AspNetCore.Mvc;
+
+namespace PlanTempus.Application.Features.Suppliers.Components;
+
+public class SupplierRowViewComponent : ViewComponent
+{
+    public IViewComponentResult Invoke(SupplierItemViewModel supplier)
+    {
+        return View(supplier);
+    }
+}

PlanTempus.Application/Features/Suppliers/Components/SupplierTable/Default.cshtml

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+@model PlanTempus.Application.Features.Suppliers.Components.SupplierTableViewModel
+
+<swp-action-bar>
+    <swp-search-input>
+        <i class="ph ph-magnifying-glass"></i>
+        <input type="text" id="supplierSearchInput" placeholder="@Model.SearchPlaceholder" />
+    </swp-search-input>
+    <swp-btn-group>
+        <swp-btn class="secondary">
+            <i class="ph ph-export"></i>
+            <span>@Model.ExportButtonText</span>
+        </swp-btn>
+        <swp-btn class="primary">
+            <i class="ph ph-plus"></i>
+            <span>@Model.CreateButtonText</span>
+        </swp-btn>
+    </swp-btn-group>
+</swp-action-bar>
+
+<swp-card class="suppliers-list">
+    <swp-data-table>
+        <swp-data-table-header>
+            <swp-data-table-cell>@Model.ColumnSupplier</swp-data-table-cell>
+            <swp-data-table-cell>@Model.ColumnContact</swp-data-table-cell>
+            <swp-data-table-cell>@Model.ColumnProducts</swp-data-table-cell>
+            <swp-data-table-cell>@Model.ColumnLastOrder</swp-data-table-cell>
+            <swp-data-table-cell>@Model.ColumnStatus</swp-data-table-cell>
+        </swp-data-table-header>
+        @foreach (var supplier in Model.Suppliers)
+        {
+            @await Component.InvokeAsync("SupplierRow", supplier)
+        }
+    </swp-data-table>
+
+    <swp-empty-state id="supplierEmptyState" style="display: none;">
+        <i class="ph ph-package"></i>
+        <span>@Model.EmptySearchText</span>
+    </swp-empty-state>
+</swp-card>

PlanTempus.Application/Features/Suppliers/Components/SupplierTable/SupplierTableViewComponent.cs

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+using System.Globalization;
+using System.Text.Json;
+using Microsoft.AspNetCore.Mvc;
+using PlanTempus.Application.Features.Localization.Services;
+
+namespace PlanTempus.Application.Features.Suppliers.Components;
+
+public class SupplierTableViewComponent : ViewComponent
+{
+    private readonly ILocalizationService _localization;
+    private readonly IWebHostEnvironment _env;
+
+    public SupplierTableViewComponent(ILocalizationService localization, IWebHostEnvironment env)
+    {
+        _localization = localization;
+        _env = env;
+    }
+
+    public IViewComponentResult Invoke()
+    {
+        var data = LoadSupplierData();
+        var model = new SupplierTableViewModel
+        {
+            SearchPlaceholder = _localization.Get("suppliers.searchPlaceholder"),
+            ExportButtonText = _localization.Get("suppliers.export"),
+            CreateButtonText = _localization.Get("suppliers.create"),
+            ColumnSupplier = _localization.Get("suppliers.column.supplier"),
+            ColumnContact = _localization.Get("suppliers.column.contact"),
+            ColumnProducts = _localization.Get("suppliers.column.products"),
+            ColumnLastOrder = _localization.Get("suppliers.column.lastOrder"),
+            ColumnStatus = _localization.Get("suppliers.column.status"),
+            EmptySearchText = _localization.Get("suppliers.emptySearch"),
+            Suppliers = data.Suppliers
+                .OrderBy(s => s.Name)
+                .Select(s => new SupplierItemViewModel
+                {
+                    Id = s.Id,
+                    Name = s.Name,
+                    City = s.City,
+                    ContactPerson = s.ContactPerson,
+                    ProductCount = s.ProductCount,
+                    LastOrderDate = FormatLastOrder(s.LastOrder),
+                    IsActive = s.IsActive,
+                    StatusClass = s.IsActive ? "active" : "inactive",
+                    StatusText = s.IsActive
+                        ? _localization.Get("suppliers.status.active")
+                        : _localization.Get("suppliers.status.inactive")
+                })
+                .ToList()
+        };
+
+        return View(model);
+    }
+
+    private SupplierMockData LoadSupplierData()
+    {
+        var jsonPath = Path.Combine(_env.ContentRootPath, "Features", "Suppliers", "Data", "suppliersMock.json");
+        var json = System.IO.File.ReadAllText(jsonPath);
+        return JsonSerializer.Deserialize<SupplierMockData>(json, new JsonSerializerOptions
+        {
+            PropertyNameCaseInsensitive = true
+        }) ?? new SupplierMockData();
+    }
+
+    private static string FormatLastOrder(string dateStr)
+    {
+        if (DateTime.TryParse(dateStr, out var date))
+        {
+            return date.ToString("d. MMMM yyyy", new CultureInfo("da-DK"));
+        }
+        return dateStr;
+    }
+}
+
+public class SupplierTableViewModel
+{
+    public required string SearchPlaceholder { get; init; }
+    public required string ExportButtonText { get; init; }
+    public required string CreateButtonText { get; init; }
+    public required string ColumnSupplier { get; init; }
+    public required string ColumnContact { get; init; }
+    public required string ColumnProducts { get; init; }
+    public required string ColumnLastOrder { get; init; }
+    public required string ColumnStatus { get; init; }
+    public required string EmptySearchText { get; init; }
+    public required IReadOnlyList<SupplierItemViewModel> Suppliers { get; init; }
+}
+
+public class SupplierItemViewModel
+{
+    public required string Id { get; init; }
+    public required string Name { get; init; }
+    public required string City { get; init; }
+    public required string ContactPerson { get; init; }
+    public int ProductCount { get; init; }
+    public required string LastOrderDate { get; init; }
+    public bool IsActive { get; init; }
+    public required string StatusClass { get; init; }
+    public required string StatusText { get; init; }
+}
+
+internal class SupplierMockData
+{
+    public List<SupplierData> Suppliers { get; set; } = new();
+}
+
+internal class SupplierData
+{
+    public string Id { get; set; } = "";
+    public string Name { get; set; } = "";
+    public string City { get; set; } = "";
+    public string ContactPerson { get; set; } = "";
+    public int ProductCount { get; set; }
+    public string LastOrder { get; set; } = "";
+    public bool IsActive { get; set; }
+}