refactor(space): polish focus hud ui

src/widgets/space-focus-hud/ui/SpaceFocusHudWidget.tsx

@@ -175,9 +175,9 @@ export const SpaceFocusHudWidget = ({
                   <button
                     type="button"
                     onClick={() => setOverlay("end-session")}
-                    className="text-[11px] font-bold uppercase tracking-[0.25em] text-white/34 transition hover:text-white/76"
+                    className="rounded-full border border-white/10 bg-black/20 px-5 py-2 text-[11px] font-bold uppercase tracking-[0.25em] text-white/70 backdrop-blur-md shadow-md transition-all hover:border-white/20 hover:bg-black/40 hover:text-white active:scale-95"
                   >
-                    {copy.space.endSession.trigger}
+                    <span className="drop-shadow-md">{copy.space.endSession.trigger}</span>
                   </button>
                 </div>
               )}