Add PageNoteButton to various components for enhanced note management

WebApp/Components/Pages/NoteEditDialog.razor

@@ -6,7 +6,7 @@
 @inject ISnackbar Snackbar
 @inject IDialogService DialogService
 
-<MudDialog>
+<MudDialog Class="@MarkdownHelper.GetNoteColorClass(_note.Id)">
     <DialogContent>
         <MudStack Spacing="3">
             <MudTextField @bind-Value="_note.Title"
@@ -14,7 +14,8 @@
                          Variant="Variant.Outlined"
                          Required="true"
                          RequiredError="Title is required"
-                         MaxLength="200" />
+                         MaxLength="200"
+                         ReadOnly="@IsPageNote" />
 
             <MudText Typo="Typo.subtitle2" Class="mb-2">Content (Markdown)</MudText>
             <MarkdownEditor Value="@_note.Content"
@@ -42,6 +43,8 @@
 
     private Note _note = null!;
 
+    private bool IsPageNote => Note?.Title?.StartsWith("@") ?? false;
+
     protected override void OnInitialized()
     {
         _note = new Note

WebApp/Components/Pages/NoteHistoryDialog.razor

@@ -4,7 +4,7 @@
 @inject INotesService NotesService
 @inject IDialogService DialogService
 
-<MudDialog>
+<MudDialog Class="@MarkdownHelper.GetNoteColorClass(NoteId)">
     <DialogContent>
         @if (_isLoading)
         {

WebApp/Components/Pages/NoteVersionViewDialog.razor

@@ -2,7 +2,7 @@
 @using WebApp.Services
 @using MudBlazor
 
-<MudDialog>
+<MudDialog Class="@MarkdownHelper.GetNoteColorClass(_history.NoteId)">
     <DialogContent>
         <MudStack Spacing="3">
             <MudText Typo="Typo.h6">@_history.Title</MudText>

WebApp/Components/Pages/Notes.razor

@@ -54,7 +54,8 @@
                         <MudExpansionPanel @key="@($"note-{noteId}")"
                                            Icon="@Icons.Material.Filled.Note"
                                            IsExpanded="@isExpanded"
-                                           ExpandedChanged="@((bool expanded) => OnPanelExpandedChanged(noteId, expanded))">
+                                           ExpandedChanged="@((bool expanded) => OnPanelExpandedChanged(noteId, expanded))"
+                                           Class="@MarkdownHelper.GetNoteColorClass(noteId)">
                             <TitleContent>
                                 <MudStack Row="true" AlignItems="AlignItems.Center" Spacing="2" Class="flex-grow-1">
                                     <MudText Typo="Typo.body1" Class="flex-grow-1" Style="min-width: 0;">
@@ -402,7 +403,7 @@
 
             var result = await DialogService.ShowMessageBox(
                 "Delete Note",
-                (MarkupString)$"Are you sure you want to delete <b>{note.Title}</b>? This cannot be undone.",
+                (MarkupString)$"Are you sure you want to delete <b>{note.Title}</b>? You can restore it later from the 'Show Removed' view.",
                 yesText: "Yes",
                 noText: "Cancel");