feat: enhance DeesTable with server-side search and Lucene filtering capabilities

ts_web/elements/dees-input-checkbox.ts

@@ -28,6 +28,9 @@ export class DeesInputCheckbox extends DeesInputBase<DeesInputCheckbox> {
   })
   public value: boolean = false;
 
+  @property({ type: Boolean })
+  public indeterminate: boolean = false;
+
 
   constructor() {
     super();
@@ -166,7 +169,15 @@ export class DeesInputCheckbox extends DeesInputBase<DeesInputCheckbox> {
                     </svg>
                   </span>
                 `
-              : html``}
+              : this.indeterminate
+                ? html`
+                    <span class="checkmark">
+                      <svg viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+                        <path d="M5 12H19" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+                      </svg>
+                    </span>
+                  `
+                : html``}
           </div>
           <div class="label-container">
             ${this.label ? html`<div class="checkbox-label">${this.label}</div>` : ''}