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/Calendar/Import.razor

@@ -19,7 +19,7 @@
 
 <MudGrid>
     <MudItem xs="12" md="6">
-        <MudPaper Elevation="2" Class="pa-6">
+        <MudPaper Elevation="2" Class="pa-3 pa-md-6">
             <MudText Typo="Typo.h5" Class="mb-4">Paste Event Occurrence Data</MudText>
             <MudStack Spacing="3">
                 <MudTextField 
@@ -53,7 +53,7 @@
     </MudItem>
 
     <MudItem xs="12" md="6">
-        <MudPaper Elevation="2" Class="pa-6">
+        <MudPaper Elevation="2" Class="pa-3 pa-md-6">
             <MudText Typo="Typo.h5" Class="mb-4">Parsed Results</MudText>
             
             @if (_isParsing)