Replace deprecated Angular directives (*ngFor, *ngIf) with modern Angular template syntax. Remove unused CommonModule imports across components for optimization. Clean up excess spacing and formatting in HTML files.

frontend/src/app/pages/particles/components/render-container/render-container.component.ts

@@ -1,6 +1,6 @@
 import {AfterViewInit, Component, ElementRef, OnDestroy, ViewChild} from '@angular/core';
 import {MatMiniFabButton} from '@angular/material/button';
-import {NgIf} from '@angular/common';
+
 import {IntersectionPlaneService, PlaneOrientation} from '../../services/intersection-plane.service';
 import {MatIcon} from '@angular/material/icon';
 import {MatTooltip} from '@angular/material/tooltip';
@@ -16,12 +16,11 @@ import {MatFormField, MatInput, MatLabel} from '@angular/material/input';
     MatIcon,
     MatMiniFabButton,
     MatTooltip,
-    NgIf,
     FormsModule,
     MatInput,
     MatFormField,
     MatLabel
-  ],
+],
   templateUrl: './render-container.component.html',
   styleUrl: './render-container.component.scss'
 })