Refactor IP copy functionality into a reusable component

Extracted the "Copy IP" button to a new `CopyIpComponent` to improve reusability and modularity. Updated `HomeComponent` to use this new component and removed redundant methods for copying text to the clipboard. Added tests and styles for the new component.

frontend/src/app/copy-ip/copy-ip.component.html

@@ -0,0 +1,3 @@
+<button type="button" style="margin-top: 50px;" class="button-outer" (click)="copyIpToClipboard()">
+  <span class="button-inner">{{ displayText }}</span>
+</button>