Add comprehensive validation system with runtime configuration

Implements a flexible validation framework for student rankings, team assignments, and team composition with administrator-configurable rules and thresholds.

Validation System:
- Reflection-based rule discovery eliminates manual registration
- Base classes (RequiredEventTypeRuleBase, EventCountThresholdRuleBase) reduce code duplication by ~250 lines
- 12 validation rules covering event requirements, counts, and team constraints
- Configurable severity levels (Warning/Error) per rule type
- ValidationService with caching for optimal performance
- Rules apply contextually (StudentRanking, StudentAssignment, TeamComposition)

Configuration & Admin UI:
- ValidationSettings admin page for editing thresholds and severity levels
- ChapterSettings admin page for editing chapter information
- Settings stored in Data/appsettings.json for runtime configuration
- JSON config works in both development and production environments
- Auto-creates Data directory and config template on first run

User Experience:
- ValidationWarnings component displays inline warnings/errors
- Integrated in Event Ranking, Registration, and Team Assignment pages
- Color-coded severity indicators (warning yellow, error red)
- Includes "Too Many Regional Events" rule (max 3 recommended)

Technical Improvements:
- Template Method pattern for rule base classes
- Singleton rule instances with lazy initialization
- Configuration loaded via IConfiguration with fallback to defaults
- Safe JSON updates preserve other appsettings sections

WebApp/Components/Features/Events/Components/EventAttributes.razor

@@ -1,6 +1,12 @@
 @using WebApp.Models
 
+<span style=""></span>
+@if (EventDefinition.LevelOfEffort.HasValue)
+{
+    <span class="numberCircle">@EventDefinition.LevelOfEffort</span>
+}
 <MudText Style="font-family: monospace; white-space: pre;">
+    
     @foreach (var charStr in _attributes.Select(c => c.ToString()))
     {
         if (AppIcons.IconTooltips.TryGetValue(charStr, out var tooltip))
@@ -23,9 +29,7 @@
 
     protected override void OnParametersSet()
     {
-        _attributes = AppIcons.LevelOfEffortIcon(EventDefinition.LevelOfEffort);
-        _attributes += " ";
-        _attributes += EventDefinition.EventFormat == EventFormat.Individual ? AppIcons.IndividualEvent : " ";
+        _attributes = EventDefinition.EventFormat == EventFormat.Individual ? AppIcons.IndividualEvent : " ";
         _attributes += EventDefinition.OnSiteActivity ? AppIcons.OnSiteActivity : " ";
         _attributes += EventDefinition.RegionalEvent ? AppIcons.RegionalEvent : " ";
         _attributes += EventDefinition.InterviewOrPresentation ? AppIcons.PresentationEvent : " ";

WebApp/Components/Features/Students/EventRanking.razor

@@ -2,7 +2,9 @@
 @attribute [Authorize]
 @using Microsoft.EntityFrameworkCore
 @using WebApp.Models
+@using Core.Validation
 @inject AppDbContext Context
+@inject ValidationService ValidationService
 @rendermode InteractiveServer
 
 <PageTitle>Student Event Ranks - TSA Chapter Organizer</PageTitle>
@@ -37,25 +39,7 @@ else
             <MudTh>@context.TsaYear</MudTh>
             <MudTd><MudButton StartIcon="@Icons.Material.Filled.TableChart" Href="@($"students/event-ranking-edit/{context.Id}")">Edit</MudButton></MudTd>
             <MudTd>
-                @if (!context.RankedEvents.Any(re => re.OnSiteActivity))
-                {
-                    <MudTooltip Text="No On-Site Activity">
-                        <MudText Style="font-weight:bolder" Color="Color.Warning">@AppIcons.OnSiteActivity</MudText>
-                    </MudTooltip>
-                }
-                @if (!context.RankedEvents.Any(re => re.RegionalEvent))
-                {
-                    <MudTooltip Text="No Regional Event">
-                        <MudText Style="font-weight:bolder" Color="Color.Warning">@AppIcons.RegionalEvent</MudText>
-                    </MudTooltip>
-                }
-
-                @if (context.RankedEvents.All(re => re.EventFormat != EventFormat.Individual))
-                {
-                    <MudTooltip Text="No Individual Event">
-                        <MudText Style="font-weight:bolder" Color="Color.Warning">@AppIcons.IndividualEvent</MudText>
-                    </MudTooltip>
-                }
+                <ValidationWarnings Warnings="@GetStudentWarnings(context)" />
             </MudTd>
             @for (var i = 1; i <= 10; i++)
             {
@@ -154,4 +138,9 @@ else
 
         _maxEventStudentRankings = _eventStudentRankings.Max(esr => esr.StudentRanking.Length);
     }
+
+    private List<ValidationWarning> GetStudentWarnings(Student student)
+    {
+        return ValidationService.ValidateStudentRankings(student, ValidationContext.StudentRanking);
+    }
 }

WebApp/Components/Features/Students/Registration.razor

@@ -2,8 +2,10 @@
 @attribute [Authorize]
 @using Microsoft.EntityFrameworkCore
 @using WebApp.Models
+@using Core.Validation
 @inject AppDbContext Context
 @inject WebApp.LocalStorageService LocalStorage
+@inject ValidationService ValidationService
 
 <PageTitle>Registration - TSA Chapter Organizer</PageTitle>
 
@@ -43,6 +45,11 @@
                 </MudTooltip>
             </CellTemplate>
         </PropertyColumn>
+        <TemplateColumn Title="Warnings" Sortable="false">
+            <CellTemplate>
+                <ValidationWarnings Warnings="@GetRegistrationWarnings(context.Item.Student)" />
+            </CellTemplate>
+        </TemplateColumn>
         @if (_showGrade)
         {
             <PropertyColumn Property="@(e => e.Student.Grade)" Title="Grade" Sortable="true" />
@@ -239,6 +246,20 @@
             : data.OrderBy(sortExpression);
     }
 
+    private List<ValidationWarning> GetRegistrationWarnings(Student student)
+    {
+        // Create StudentEventStatistics from the student's teams
+        var stats = new StudentEventStatistics
+        {
+            Student = student,
+            Events = student.Teams?.Where(t => t?.Event != null)
+                                  .Select(t => t.Event)
+                                  .ToList() ?? new List<EventDefinition>()
+        };
+
+        return ValidationService.ValidateStudentStatistics(stats, ValidationContext.StudentRegistration);
+    }
+
     public class StudentTeamInfo
     {
         public required Student Student { get; init; }

WebApp/Components/Features/Teams/Assignment.razor

@@ -1,12 +1,14 @@
 @page "/teams/assignment"
 @attribute [Authorize]
 @using Core.Calculation
+@using Core.Validation
 @using Microsoft.EntityFrameworkCore
 @using WebApp.Models
 @using EventAssignment = Core.Calculation.EventAssignment
 @inject AppDbContext Context
 @inject IDialogService DialogService
 @inject NavigationManager NavigationManager
+@inject ValidationService ValidationService
 
 <PageTitle>Event Assignment - TSA Chapter Organizer</PageTitle>
 
@@ -134,18 +136,8 @@
                 <MudTd><b>@context.Student.FirstName</b></MudTd>
                 <MudTd>@context.EventCount</MudTd>
                 <MudTd>@context.TotalLevelOfEffort</MudTd>
-                <MudTd>@if (!context.HasOnSiteActivity)
-                       {
-                           <MudTooltip Text="No On-Site Activity">
-                            <MudText Style="font-weight:bolder" Color="Color.Warning">@AppIcons.OnSiteActivity</MudText>
-                           </MudTooltip>
-                       }
-                    @if (!context.HasRegionalEvent)
-                    {
-                        <MudTooltip Text="No Regional Event">
-                            <MudText Style="font-weight:bolder" Color="Color.Warning">@AppIcons.RegionalEvent</MudText>
-                        </MudTooltip>
-                    }
+                <MudTd>
+                    <ValidationWarnings Warnings="@GetStatisticsWarnings(context)" />
                 </MudTd>
             </RowTemplate>
             <ChildRowContent>
@@ -313,6 +305,7 @@
     public bool TestSwitch { get; set; } = false;
 
     private readonly AssignmentParameters _parameters = new() { RequireOnSite = false, RequireRegional = false };
+    private ValidationService _validationService = new ValidationService(ValidationConfiguration.Default);
 
     private List<EventDefinition>? _events;
     private List<Student>? _students;
@@ -367,6 +360,7 @@
     private async Task<TableData<Team>> SolveAssignments(TableState arg1, CancellationToken arg2)
     {
         _isSolving = true;
+        UpdateValidationConfig();
         var eventAssignment = new EventAssignment(_events, _students, _parameters);
         foreach (var requirement in _assignmentRequirements)
         {
@@ -396,6 +390,17 @@
         return new TableData<StudentEventStatistics> {Items = _statistics};
     }
 
+    private void UpdateValidationConfig()
+    {
+        var config = ValidationConfiguration.FromAssignmentParameters(_parameters);
+        _validationService = new ValidationService(config);
+    }
+
+    private List<ValidationWarning> GetStatisticsWarnings(StudentEventStatistics stats)
+    {
+        return _validationService.ValidateStudentStatistics(stats, ValidationContext.StudentAssignment);
+    }
+
     private async Task<TableData<AssignmentRequirement>> ReloadAssignmentRequirements(TableState arg1, CancellationToken arg2)
     {
         return new TableData<AssignmentRequirement> { Items = _assignmentRequirements };