feat: Add stock lengths management UI to Material Edit page

Extends the Material Edit page with a side panel to manage available
stock lengths, including quantity tracking and CRUD operations.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CutList.Web/Components/Pages/Materials/Edit.razor

@@ -2,10 +2,11 @@
 @page "/materials/{Id:int}"
 @inject MaterialService MaterialService
 @inject NavigationManager Navigation
+@using CutList.Core.Formatting
 
 <PageTitle>@(IsNew ? "Add Material" : "Edit Material")</PageTitle>
 
-<h1>@(IsNew ? "Add Material" : "Edit Material")</h1>
+<h1>@(IsNew ? "Add Material" : material.DisplayName)</h1>
 
 @if (loading)
 {
@@ -14,7 +15,12 @@
 else
 {
     <div class="row">
-        <div class="col-md-6">
+        <div class="col-lg-6 mb-4">
+            <div class="card">
+                <div class="card-header">
+                    <h5 class="mb-0">Material Details</h5>
+                </div>
+                <div class="card-body">
                     <EditForm Model="material" OnValidSubmit="SaveAsync">
                         <DataAnnotationsValidator />
 
@@ -53,24 +59,126 @@ else
                                 {
                                     <span class="spinner-border spinner-border-sm me-1"></span>
                                 }
-                        @(IsNew ? "Create" : "Save")
+                                @(IsNew ? "Create Material" : "Save Changes")
                             </button>
-                    <a href="materials" class="btn btn-outline-secondary">Cancel</a>
+                            <a href="materials" class="btn btn-outline-secondary">@(IsNew ? "Cancel" : "Back to List")</a>
                         </div>
                     </EditForm>
                 </div>
             </div>
+        </div>
+
+        @if (!IsNew)
+        {
+            <div class="col-lg-6">
+                <div class="card">
+                    <div class="card-header d-flex justify-content-between align-items-center">
+                        <h5 class="mb-0">Available Stock Lengths</h5>
+                        <button class="btn btn-sm btn-primary" @onclick="ShowAddStockForm">Add Length</button>
+                    </div>
+                    <div class="card-body">
+                        @if (showStockForm)
+                        {
+                            <div class="border rounded p-3 mb-3 bg-light">
+                                <h6>@(editingStock == null ? "Add Stock Length" : "Edit Stock Length")</h6>
+                                <div class="row g-2">
+                                    <div class="col-md-4">
+                                        <label class="form-label">Length</label>
+                                        <LengthInput @bind-Value="newStock.LengthInches" />
+                                    </div>
+                                    <div class="col-md-3">
+                                        <label class="form-label">Qty in Stock</label>
+                                        <input type="number" class="form-control" @bind="newStock.Quantity" min="0" />
+                                    </div>
+                                    <div class="col-md-5">
+                                        <label class="form-label">Notes (optional)</label>
+                                        <InputText class="form-control" @bind-Value="newStock.Notes" />
+                                    </div>
+                                </div>
+                                @if (!string.IsNullOrEmpty(stockErrorMessage))
+                                {
+                                    <div class="alert alert-danger mt-2 mb-0">@stockErrorMessage</div>
+                                }
+                                <div class="mt-3 d-flex gap-2">
+                                    <button class="btn btn-primary btn-sm" @onclick="SaveStockAsync" disabled="@savingStock">
+                                        @if (savingStock)
+                                        {
+                                            <span class="spinner-border spinner-border-sm me-1"></span>
+                                        }
+                                        @(editingStock == null ? "Add" : "Save")
+                                    </button>
+                                    <button class="btn btn-outline-secondary btn-sm" @onclick="CancelStockForm">Cancel</button>
+                                </div>
+                            </div>
+                        }
+
+                        @if (stockLengths.Count == 0)
+                        {
+                            <p class="text-muted">No stock lengths configured yet.</p>
+                            <p class="text-muted small">Add common stock lengths for this material (e.g., 20', 24') to quickly populate project stock bins.</p>
+                        }
+                        else
+                        {
+                            <table class="table table-sm">
+                                <thead>
+                                    <tr>
+                                        <th>Length</th>
+                                        <th>Qty</th>
+                                        <th>Notes</th>
+                                        <th style="width: 100px;">Actions</th>
+                                    </tr>
+                                </thead>
+                                <tbody>
+                                    @foreach (var stock in stockLengths)
+                                    {
+                                        <tr>
+                                            <td>@ArchUnits.FormatFromInches((double)stock.LengthInches)</td>
+                                            <td>@stock.Quantity</td>
+                                            <td>@(stock.Notes ?? "-")</td>
+                                            <td>
+                                                <button class="btn btn-sm btn-outline-primary" @onclick="() => EditStock(stock)">Edit</button>
+                                                <button class="btn btn-sm btn-outline-danger" @onclick="() => ConfirmDeleteStock(stock)">Delete</button>
+                                            </td>
+                                        </tr>
+                                    }
+                                </tbody>
+                            </table>
+                        }
+                    </div>
+                </div>
+            </div>
+        }
+    </div>
 }
 
+<ConfirmDialog @ref="deleteStockDialog"
+               Title="Delete Stock Length"
+               Message="@deleteStockMessage"
+               ConfirmText="Delete"
+               OnConfirm="DeleteStockConfirmed" />
+
 @code {
     [Parameter]
     public int? Id { get; set; }
 
     private Material material = new();
+    private List<MaterialStockLength> stockLengths = new();
     private bool loading = true;
     private bool saving;
     private string? errorMessage;
 
+    // Stock form
+    private bool showStockForm;
+    private bool savingStock;
+    private MaterialStockLength newStock = new();
+    private MaterialStockLength? editingStock;
+    private string? stockErrorMessage;
+
+    // Delete dialog
+    private ConfirmDialog deleteStockDialog = null!;
+    private MaterialStockLength? stockToDelete;
+    private string deleteStockMessage = "";
+
     private bool IsNew => !Id.HasValue;
 
     protected override async Task OnInitializedAsync()
@@ -84,6 +192,7 @@ else
                 return;
             }
             material = existing;
+            stockLengths = await MaterialService.GetStockLengthsAsync(Id.Value);
         }
         loading = false;
     }
@@ -116,18 +225,107 @@ else
 
             if (IsNew)
             {
-                await MaterialService.CreateAsync(material);
+                var created = await MaterialService.CreateAsync(material);
+                Navigation.NavigateTo($"materials/{created.Id}");
             }
             else
             {
                 await MaterialService.UpdateAsync(material);
             }
-
-            Navigation.NavigateTo("materials");
         }
         finally
         {
             saving = false;
         }
     }
+
+    // Stock length methods
+    private void ShowAddStockForm()
+    {
+        editingStock = null;
+        newStock = new MaterialStockLength { MaterialId = Id!.Value };
+        showStockForm = true;
+        stockErrorMessage = null;
+    }
+
+    private void EditStock(MaterialStockLength stock)
+    {
+        editingStock = stock;
+        newStock = new MaterialStockLength
+        {
+            Id = stock.Id,
+            MaterialId = stock.MaterialId,
+            LengthInches = stock.LengthInches,
+            Quantity = stock.Quantity,
+            Notes = stock.Notes
+        };
+        showStockForm = true;
+        stockErrorMessage = null;
+    }
+
+    private void CancelStockForm()
+    {
+        showStockForm = false;
+        editingStock = null;
+        stockErrorMessage = null;
+    }
+
+    private async Task SaveStockAsync()
+    {
+        stockErrorMessage = null;
+        savingStock = true;
+
+        try
+        {
+            if (newStock.LengthInches <= 0)
+            {
+                stockErrorMessage = "Length must be greater than zero";
+                return;
+            }
+
+            var exists = await MaterialService.StockLengthExistsAsync(
+                newStock.MaterialId,
+                newStock.LengthInches,
+                editingStock?.Id);
+
+            if (exists)
+            {
+                stockErrorMessage = "This stock length already exists for this material";
+                return;
+            }
+
+            if (editingStock == null)
+            {
+                await MaterialService.AddStockLengthAsync(newStock);
+            }
+            else
+            {
+                await MaterialService.UpdateStockLengthAsync(newStock);
+            }
+
+            stockLengths = await MaterialService.GetStockLengthsAsync(Id!.Value);
+            showStockForm = false;
+            editingStock = null;
+        }
+        finally
+        {
+            savingStock = false;
+        }
+    }
+
+    private void ConfirmDeleteStock(MaterialStockLength stock)
+    {
+        stockToDelete = stock;
+        deleteStockMessage = $"Are you sure you want to delete the {ArchUnits.FormatFromInches((double)stock.LengthInches)} stock length?";
+        deleteStockDialog.Show();
+    }
+
+    private async Task DeleteStockConfirmed()
+    {
+        if (stockToDelete != null)
+        {
+            await MaterialService.DeleteStockLengthAsync(stockToDelete.Id);
+            stockLengths = await MaterialService.GetStockLengthsAsync(Id!.Value);
+        }
+    }
 }