Homepage update & add 3 public lobbies (#3191)

## Description:

Update UI 
check https://homepageupdate.openfront.dev/ 

Improved mobile UI (now fills whole screen for all modals) e.g.:
<img width="432" height="852" alt="image"
src="https://github.com/user-attachments/assets/56de40af-4137-4c57-96b7-3910c9a665b8"
/>

Converted PublicLobby to be "GameModeSelector" to get a nicer 4x4 grid
div, where <GameModeSelector> now handles all the username validation
now (removed redundant code from modals such as matchmaking) also fixed
a bug where someone could have "[XX] X" as thier username (when the
minimum should be 3 chars for their name)

Now visually displays the 3 lobbies ffa/team/special (which is a
continuation from the work done in: #3196 )
<img width="818" height="563" alt="image"
src="https://github.com/user-attachments/assets/a15cd31b-6061-4fb8-83ee-ffde6225cfa7"
/>

updated the background:
<img width="1919" height="807" alt="image"
src="https://github.com/user-attachments/assets/358a7434-51b8-4540-baf2-d1be05053c44"
/>



slightly updated the glassy-look to be less glassy:
<img width="825" height="729" alt="image"
src="https://github.com/user-attachments/assets/1801871b-bbf8-43db-ac53-489337ae80a5"
/>



## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

w.o.n

src/client/components/baseComponents/Modal.ts

@@ -67,7 +67,7 @@ export class OModal extends LitElement {
 
     const wrapperClass = this.inline
       ? "relative flex flex-col w-full h-full m-0 max-w-full max-h-none shadow-none"
-      : `relative flex flex-col w-[90%] min-w-[400px] max-w-[900px] m-8 rounded-lg shadow-[0_20px_60px_rgba(0,0,0,0.8)] max-h-[calc(100vh-4rem)] ${
+      : `relative flex flex-col w-full h-full lg:w-[90%] lg:h-auto lg:min-w-[400px] lg:max-w-[900px] lg:m-8 lg:rounded-lg shadow-[0_20px_60px_rgba(0,0,0,0.8)] lg:max-h-[calc(100vh-4rem)] ${
           this.alwaysMaximized ? "h-auto" : ""
         }`;
     const wrapperStyle =
@@ -101,7 +101,7 @@ export class OModal extends LitElement {
                     </div>`
                   : html``}
                 <section
-                  class="relative flex-1 min-h-0 p-[1.4rem] text-white bg-[#23232382] backdrop-blur-md rounded-lg overflow-y-auto"
+                  class="relative flex-1 min-h-0 p-0 lg:p-[1.4rem] text-white bg-[#23232382] backdrop-blur-md lg:rounded-lg overflow-y-auto"
                 >
                   <slot></slot>
                 </section>