Refactor MudPaper component styling across various features for consistency

Updated the MudPaper component styling in multiple files to use a consistent padding class of "pa-3 pa-md-6" instead of "pa-6". This change enhances the visual consistency of the UI across the Calendar, Events, Students, and Teams components, improving the overall user experience.

WebApp/Components/Features/MeetingSchedule/Index.razor

@@ -11,9 +11,9 @@
 
 <PageHeader Title="@($"{Configuration["ChapterSettings:Shortname"]} TSA Schedule {Configuration["ChapterSettings:CompetitionYear"]}")" />
 
-<MudPaper Elevation="2" Class="pa-6 mt-4">
+<MudPaper Elevation="2" Class="pa-3 pa-md-6 mt-4">
     <MudGrid>
-        <MudItem xs="7" sm="8" lg="9">
+        <MudItem xs="12" sm="8" lg="9">
             <MudText Typo="Typo.h4">Time Slots</MudText>
             <MudPaper Class="pa-2 ma-2" Elevation="3">
                 <MudGrid>
@@ -81,7 +81,7 @@
                 </RowTemplate>
             </MudTable>
         </MudItem>
-        <MudItem xs="5" sm="4" lg="3">
+        <MudItem xs="12" sm="4" lg="3">
             <MudStack>
                 <StudentTextBoxSelector Students="@_students"
                                         SelectedStudents="_absentStudents"