Improve Key Interaction Visibility (#428)

## Description:
Enhanced the visual clarity of key inputs using custom CSS.
Keyboard keys now appear more distinct and intuitive, making the help
modal easier to understand at a glance.
Keys can be changed easily.

Fixes #477 

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

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

<DISCORD USERNAME>
aotumuri(.w. / (๑-̀ㅂ-́)و✧)

src/client/styles.css

@@ -8,6 +8,7 @@
 @import url("./styles/layout/container.css");
 @import url("./styles/components/button.css");
 @import url("./styles/components/modal.css");
+@import url("./styles/components/controls.css");
 * {
   -webkit-box-sizing: border-box;
   -moz-box-sizing: border-box;