Add a student/team list used for registration

WebApp/Components/Features/Students/Index.razor

@@ -12,11 +12,11 @@
 
 <MudButton StartIcon="@Icons.Material.Filled.Create" Href="students/create">Create New</MudButton>
 <MudButton StartIcon="@AppIcons.EventRank" Href="students/event-ranking">Event Rankings</MudButton>
+<MudButton StartIcon="@Icons.Material.Filled.AppRegistration" Href="students/teams">Registration</MudButton>
 
 <MudDataGrid T="Student" ServerData="ServerReload" @ref="_dataGrid" Filterable="true" RowsPerPage="25">
     <Columns>
-        @* <PropertyColumn Property="@(e => e.Name)" Title="First Name" SortBy="e => e.FirstName" /> *@
-        <TemplateColumn Title="Name" SortBy="e => e.LastName" Sortable="true" >
+        <PropertyColumn Property="@(e => e.LastName)" Title="Name" Sortable="true">
             <CellTemplate>
                 @context.Item.LastNameFirstName
                 @if (context.Item.OfficerRole != null)
@@ -24,12 +24,12 @@
                     <MudChip T="string" Icon="@(AppIcons.OfficerRoleIcon(context.Item.OfficerRole.Value))">@context.Item.OfficerRole</MudChip>
                 }
             </CellTemplate>
-        </TemplateColumn>
-        <TemplateColumn Title="Grade (TSA Year)" SortBy="e => e.Grade" Sortable="true">
+        </PropertyColumn>
+        <PropertyColumn Property="@(e => e.Grade)" Title="Grade (TSA Year)" Sortable="true">
             <CellTemplate>
                 @context.Item.Grade (@context.Item.TsaYear)
             </CellTemplate>
-        </TemplateColumn>
+        </PropertyColumn>
         <TemplateColumn>
             <CellTemplate>
                 <CrudActions DetailsHref="@($"/students/details?id={context.Item!.Id}")"

WebApp/Components/Features/Students/Registration.razor

@@ -0,0 +1,206 @@
+@page "/students/teams"
+@attribute [Authorize]
+@using Microsoft.EntityFrameworkCore
+@using WebApp.Models
+@inject AppDbContext Context
+
+<PageTitle>Registration - TSA Chapter Organizer</PageTitle>
+
+<MudText Typo="Typo.h3">Registration</MudText>
+
+<MudButtonGroup>
+    <MudButton StartIcon="@Icons.Material.Filled.FilterAlt"
+               Variant="@(_showRegionalOnly ? Variant.Filled : Variant.Outlined)"
+               Color="Color.Primary"
+               OnClick="ToggleRegionalFilter">
+        @(_showRegionalOnly ? "Showing Regional Only" : "Show Regional Only")
+    </MudButton>
+</MudButtonGroup>
+
+<MudText Typo="Typo.body2" Style="margin-top: 8px; margin-bottom: 4px;">
+    <MudIcon Icon="@AppIcons.Captain" Size="Size.Small" /> = Team Captain
+</MudText>
+
+<MudText Typo="Typo.body2" Style="margin-bottom: 8px;">
+    <strong>Show Columns:</strong>
+    <MudCheckBox Value="_showGrade" ValueChanged="(bool val) => { _showGrade = val; _gridKey++; StateHasChanged(); }" Label="Grade" Dense="true" Size="Size.Small" />
+    <MudCheckBox Value="_showRegionalId" ValueChanged="(bool val) => { _showRegionalId = val; _gridKey++; StateHasChanged(); }" Label="Regional ID" Dense="true" Size="Size.Small" />
+    <MudCheckBox Value="_showStateId" ValueChanged="(bool val) => { _showStateId = val; _gridKey++; StateHasChanged(); }" Label="State ID" Dense="true" Size="Size.Small" />
+    <MudCheckBox Value="_showNationalId" ValueChanged="(bool val) => { _showNationalId = val; _gridKey++; StateHasChanged(); }" Label="National ID" Dense="true" Size="Size.Small" />
+</MudText>
+
+<MudDataGrid T="StudentTeamInfo" ServerData="ServerReload" @ref="_dataGrid" @key="_gridKey" Filterable="true" RowsPerPage="35">
+    <Columns>
+        <PropertyColumn Property="@(e => e.Student.LastName)" Title="Student" Sortable="true">
+            <CellTemplate>
+                @context.Item.Student.LastNameFirstName
+            </CellTemplate>
+        </PropertyColumn>
+        @if (_showGrade)
+        {
+            <PropertyColumn Property="@(e => e.Student.Grade)" Title="Grade" Sortable="true" />
+        }
+        @if (_showRegionalId)
+        {
+            <PropertyColumn Property="@(e => e.Student.RegionalId)" Title="Regional ID" Sortable="true" />
+        }
+        @if (_showStateId)
+        {
+            <PropertyColumn Property="@(e => e.Student.StateId)" Title="State ID" Sortable="true" />
+        }
+        @if (_showNationalId)
+        {
+            <PropertyColumn Property="@(e => e.Student.NationalId)" Title="National ID" Sortable="true" />
+        }
+        <TemplateColumn Title="Events">
+            <CellTemplate>
+                @if (context.Item.Teams != null)
+                {
+                    var teamsToDisplay = _showRegionalOnly
+                        ? context.Item.Teams.Where(t => t?.Event != null && t.Event.RegionalEvent).OrderBy(t => t.Event.Name)
+                        : context.Item.Teams.Where(t => t?.Event != null).OrderBy(t => t.Event.Name);
+
+                    foreach (var team in teamsToDisplay)
+                    {
+                        var isCaptain = team.Captain != null && team.Captain.Equals(context.Item.Student);
+                        var teamMembers = string.Join(", ", team.Students.Select(s => s.FirstName));
+
+                        <MudTooltip Text="@teamMembers">
+                            <MudChip Size="Size.Small"
+                                     Color="Color.Default"
+                                     Href="@($"/teams/edit?id={team.Id}")"
+                                     Style="cursor: pointer;">
+                                @team
+                                @if (isCaptain)
+                                {
+                                    <MudIcon Icon="@AppIcons.Captain" Size="Size.Small" Style="margin-left: 4px;" />
+                                }
+                            </MudChip>
+                        </MudTooltip>
+                    }
+                }
+            </CellTemplate>
+        </TemplateColumn>
+    </Columns>
+    <PagerContent>
+        <MudDataGridPager T="StudentTeamInfo" PageSizeOptions="new int[] { 10, 25, 35, 50, 100 }"></MudDataGridPager>
+    </PagerContent>
+</MudDataGrid>
+
+@code {
+    MudDataGrid<StudentTeamInfo> _dataGrid = null!;
+    private bool _showRegionalOnly;
+    private bool _showGrade;
+    private bool _showRegionalId;
+    private bool _showStateId;
+    private bool _showNationalId;
+
+    // TODO: Remove this workaround once MudBlazor fixes dynamic column ordering
+    // https://dev.to/the_real_slim_janey/get-in-line-customizing-column-order-in-mudblazor-3ail
+    // To remove:
+    // 1. Delete this _gridKey field
+    // 2. Remove "_gridKey++;" from all checkbox ValueChanged handlers (lines 26-29)
+    // 3. Remove "@key="_gridKey"" attribute from MudDataGrid (line 32)
+    private int _gridKey = 0;
+
+    private async Task ToggleRegionalFilter()
+    {
+        _showRegionalOnly = !_showRegionalOnly;
+        StateHasChanged();
+        await Task.Delay(10);
+        await _dataGrid.ReloadServerData();
+    }
+
+    private async Task<GridData<StudentTeamInfo>> ServerReload(GridState<StudentTeamInfo> state)
+    {
+        // Load all students with their teams
+        var students = await Context.Students
+            .Include(s => s.Teams)
+                .ThenInclude(t => t.Event)
+            .Include(s => s.Teams)
+                .ThenInclude(t => t.Captain)
+            .ToListAsync();
+
+        // Filter to only students with teams
+        var studentTeams = students
+            .Where(s => s.Teams.Any(t => t?.Event != null && (!_showRegionalOnly || t.Event.RegionalEvent)))
+            .Select(s => new StudentTeamInfo
+            {
+                Student = s,
+                Teams = s.Teams?.Where(t => t?.Event != null).ToList() ?? []
+            })
+            .ToList();
+
+        // Apply sorting
+        var sortedData = ApplySorting(studentTeams, state.SortDefinitions);
+
+        var totalItems = sortedData.Count();
+        var pagedData = sortedData.Skip(state.Page * state.PageSize).Take(state.PageSize).ToArray();
+
+        return new GridData<StudentTeamInfo>
+        {
+            TotalItems = totalItems,
+            Items = pagedData
+        };
+    }
+
+    /// <summary>
+    /// Dictionary mapping column property names to their corresponding sort expressions.
+    /// Used to provide type-safe sorting for data grid columns.
+    /// </summary>
+    /// <remarks>
+    /// Each entry maps a property path (e.g., "Student.LastName") to a function that
+    /// extracts the comparable value from a StudentTeamInfo instance.
+    /// Nullable strings are coalesced to empty strings to ensure consistent sorting behavior.
+    /// </remarks>
+    private static readonly Dictionary<string, Func<StudentTeamInfo, IComparable>> SortExpressions = new()
+    {
+        { "Student.LastName", s => s.Student.LastName },
+        { "Student.Grade", s => s.Student.Grade },
+        { "Student.RegionalId", s => s.Student.RegionalId ?? string.Empty },
+        { "Student.StateId", s => s.Student.StateId ?? string.Empty },
+        { "Student.NationalId", s => s.Student.NationalId ?? string.Empty }
+    };
+
+    /// <summary>
+    /// Applies sorting to the student team data based on the provided sort definitions.
+    /// </summary>
+    /// <param name="data">The list of StudentTeamInfo records to sort.</param>
+    /// <param name="sortDefinitions">Collection of sort definitions from the MudDataGrid state.</param>
+    /// <returns>
+    /// An IEnumerable of StudentTeamInfo sorted according to the first sort definition,
+    /// or sorted by LastName if no valid sort definition is provided.
+    /// </returns>
+    /// <remarks>
+    /// If no sort definitions are provided, or if the requested property is not found in SortExpressions,
+    /// the data will default to sorting by Student.LastName in ascending order.
+    /// Only the first sort definition is applied (multi-column sorting is not supported).
+    /// </remarks>
+    private IEnumerable<StudentTeamInfo> ApplySorting(
+        List<StudentTeamInfo> data,
+        ICollection<SortDefinition<StudentTeamInfo>> sortDefinitions)
+    {
+        if (!sortDefinitions.Any())
+        {
+            return data.OrderBy(s => s.Student.LastName);
+        }
+
+        var sortDef = sortDefinitions.First();
+        var propertyName = sortDef.SortBy;
+
+        if (!SortExpressions.TryGetValue(propertyName, out var sortExpression))
+        {
+            return data.OrderBy(s => s.Student.LastName);
+        }
+
+        return sortDef.Descending
+            ? data.OrderByDescending(sortExpression)
+            : data.OrderBy(sortExpression);
+    }
+
+    public class StudentTeamInfo
+    {
+        public required Student Student { get; init; }
+        public List<Team> Teams { get; init; } = [];
+    }
+}

WebApp/Components/Shared/Layout/NavMenu.razor

@@ -11,6 +11,7 @@
 
         <MudNavGroup Title="Teams" Icon="@Icons.Material.Outlined.Groups" Expanded="true">
             <MudNavLink Href="/teams" Match="NavLinkMatch.All"  Icon="@AppIcons.Teams">Teams</MudNavLink>
+            <MudNavLink Href="/students/teams" Icon="@Icons.Material.Filled.AppRegistration">Registration</MudNavLink>
             <MudNavLink Href="/teams/printout" Icon="@Icons.Material.Filled.Print">Print out</MudNavLink>
             <MudNavLink Href="/teams/handout" Icon="@Icons.Material.Filled.Print">Handout</MudNavLink>
         </MudNavGroup>

WebApp/Models/AppIcons.cs

@@ -11,6 +11,7 @@ namespace WebApp.Models
         public static string TeamAssignment = Icons.Material.Filled.GroupAdd;
         public static string Events = Icons.Material.Filled.Dashboard;
         public static string Scheduler = Icons.Material.Filled.CalendarMonth;
+        public static string Captain = Icons.Material.Filled.Star;
         public static string LevelOfEffortIcon(int? loe)
         {