feat: basic mobile support (#64)

* feat: add mobile navigation with responsive layout and theme controls

* feat: prevent workspace owners from removing themselves and update workspace dropdown styling

* feat: add useClickOutside hook and event listener utilities for improved UI interactions

* chore: improve mobile UI styling

* refactor: improve UI layout and buttons in boards/members views
feat: adjust /members layout

* fix: standardize layout containers and improve mobile navigation styling

* feat: update card view layout

* feat: add responsive layout to board view

* feat: readjust boards page layout

* feat: enhance table view on mobile for members page

* feat: extend mobile support with sliding side panels

* fix: prevent two panels from being open at the same time

* feat: close panels when clicking outside

* fix: adjust font-sizing for import source

---------

Co-authored-by: Henry <henry_ball@hotmail.co.uk>

apps/web/src/styles/globals.css

@@ -2,10 +2,11 @@
 @tailwind components;
 @tailwind utilities;
 
-[contenteditable=true]:empty:before {
+[contenteditable="true"]:empty:before {
   content: attr(placeholder);
   display: block;
   color: #707070;
+  font-size: 0.8rem;
 }
 
 .gradient-border::before {
@@ -18,7 +19,7 @@
     transparent 110deg,
     transparent 360deg
   );
-  content: '';
+  content: "";
   position: absolute;
   inset: -50%;
   width: 200%;