feat: support clearing the searching text

CaddyManager/Components/Pages/Caddy/CaddyReverseProxies/CaddyReverseProxiesPage.razor

@@ -21,7 +21,8 @@
     <MudSpacer />
     <MudTextField T="string" Placeholder="Search..." Adornment="Adornment.End" DebounceInterval="500" 
                   OnDebounceIntervalElapsed="HandleIntervalElapsed" @bind-Value="_debouncedText"
-                  AdornmentIcon="@Icons.Material.Filled.Search"/>
+                  AdornmentIcon="@(string.IsNullOrWhiteSpace(_debouncedText) ? Icons.Material.Filled.Search : Icons.Material.Filled.Close)"
+                  OnAdornmentClick="HandleSearchBarAdornmentClick" />
 </MudContainer>
 <MudList T="string" Style="padding-top: 16px;" SelectionMode="SelectionMode.MultiSelection"
          @bind-SelectedValues="_selectedCaddyConfigurations">

CaddyManager/Components/Pages/Caddy/CaddyReverseProxies/CaddyReverseProxiesPage.razor.cs

@@ -144,4 +144,18 @@ public partial class CaddyReverseProxiesPage : ComponentBase
         // Simply refresh the page with the new debounced text
         Refresh();
     }
+    
+    /// <summary>
+    /// Handle the click event for the search bar adornment. If the debounced text is empty, then simply refresh
+    /// to have the search be effective, otherwise, clear the debounced text to reset the search.
+    /// </summary>
+    private void HandleSearchBarAdornmentClick()
+    {
+        if (!string.IsNullOrWhiteSpace(_debouncedText))
+        {
+            _debouncedText = string.Empty;
+        }
+        
+        Refresh();
+    }
 }