standardize UI colors to fit brand guidelines (#3754)

## Description:

We have brand colors:

<img width="738" height="900" alt="Screenshot 2026-04-25 at 12 52 29 PM"
src="https://github.com/user-attachments/assets/aac69e87-91f2-4c3f-9f1e-f69f48f5943e"
/>

So update the homepage & in-game UI to use those colors:

<img width="1185" height="946" alt="Screenshot 2026-04-25 at 12 51
06 PM"
src="https://github.com/user-attachments/assets/89a0b12c-2db1-43d4-9500-fcf405c0f7ff"
/>

Also updated buttons to use the o-button element

## 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:

evan

src/client/components/baseComponents/ranking/PlayerRow.ts

@@ -240,7 +240,7 @@ export class PlayerRow extends LitElement {
   private renderTag(tag: string) {
     return html`
       <div
-        class="px-2.5 py-1 rounded bg-blue-500/10 border border-blue-500/20 text-blue-300 font-bold text-xs tracking-wide group-hover:bg-blue-500/20 transition-colors"
+        class="px-2.5 py-1 rounded bg-malibu-blue/10 border border-malibu-blue/20 text-aquarius font-bold text-xs tracking-wide group-hover:bg-malibu-blue/20 transition-colors"
       >
         ${tag}
       </div>