Update padding for MudPaper components across various features

Increased padding from 'pa-4' to 'pa-6' for MudPaper components in Events, MeetingSchedule, Students, and Teams features to ensure consistent styling and improved visual spacing.

WebApp/Components/Features/Teams/Assignment.razor

@@ -21,7 +21,7 @@
     </ActionButtons>
 </PageHeader>
 
-<MudPaper Elevation="2" Class="pa-4 mt-4">
+<MudPaper Elevation="2" Class="pa-6 mt-4">
     <MudGrid>
         <MudItem Style="width:160px;">
             <MudNumericField @bind-Value="_parameters.TeamSizeLimit"
@@ -117,7 +117,7 @@
     <MudButton Class="ma-3" OnClick="Solve" Variant="Variant.Filled" Color="Color.Primary" Disabled="@_isSolving">Solve</MudButton>
 </MudPaper>
 
-<MudPaper Elevation="2" Class="pa-4 mt-4">
+<MudPaper Elevation="2" Class="pa-6 mt-4">
     <MudGrid>
         <MudItem xs="12" lg="8">
             <MudText Typo="Typo.h5" Class="mb-4">Students</MudText>

WebApp/Components/Features/Teams/Create.razor

@@ -23,7 +23,7 @@
     <DataAnnotationsValidator />
     <MudGrid>
         <MudItem xs="12" sm="7">
-            <MudPaper Class="pa-4">
+            <MudPaper Elevation="2" Class="pa-6">
                 <MudSelect T="EventDefinition" Value="@Team.Event" ValueChanged="OnEventChanged" Label="Event">
 
                     @foreach (var evt in _events)

WebApp/Components/Features/Teams/Edit.razor

@@ -22,7 +22,7 @@
         <DataAnnotationsValidator/>
         <MudGrid>
             <MudItem xs="12" sm="7">
-                <MudPaper Class="pa-4">
+                <MudPaper Elevation="2" Class="pa-6">
                     <StudentToggleSelector Students="@_students"
                                           @bind-SelectedStudents="_selectedStudents"
                                           Title="Students"

WebApp/Components/Features/Teams/Goals.razor

@@ -16,7 +16,7 @@
 }
 else
 {
-    <MudPaper Elevation="2" Class="pa-4">
+    <MudPaper Elevation="2" Class="pa-6">
         @foreach (var student in _students)
         {
             <MudContainer Class="pagebreak">

WebApp/Components/Features/Teams/Index.razor

@@ -14,7 +14,7 @@
     </ActionButtons>
 </PageHeader>
 
-<MudPaper Elevation="2" Class="pa-4">
+<MudPaper Elevation="2" Class="pa-6">
     <MudDataGrid T="Team"
                  ServerData="ServerReload"
                  @ref="_dataGrid"