remove obsolete elements and cleanup gui

public/css/app.css

@@ -546,11 +546,13 @@ button,
     transition-duration: .01ms !important;
   }
 }
-.info-button {
+.info-control {
   position: fixed;
   top: calc(env(safe-area-inset-top) + .45rem);
   right: max(.65rem, env(safe-area-inset-right));
   z-index: 10001;
+}
+.info-button {
   display: grid;
   place-items: center;
   width: var(--icon-button-size);
@@ -571,6 +573,58 @@ button,
   outline: .2rem solid #fff;
   outline-offset: .15rem;
 }
+.info-dropdown {
+  position: absolute;
+  top: calc(100% + .45rem);
+  right: 0;
+  display: grid;
+  gap: .35rem;
+  width: min(20rem, calc(100vw - 1.3rem - env(safe-area-inset-left) - env(safe-area-inset-right)));
+  max-height: calc(100dvh - env(safe-area-inset-top) - env(safe-area-inset-bottom) - var(--icon-button-size) - 1.8rem);
+  box-sizing: border-box;
+  padding: .65rem;
+  overflow-y: auto;
+  overscroll-behavior: contain;
+  border: 1px solid rgba(49, 93, 58, .28);
+  border-radius: .8rem;
+  background: #f8f5eb;
+  color: #233326;
+  box-shadow: 0 .8rem 2rem rgba(20, 32, 22, .28);
+  transform-origin: top right;
+  transform: scaleY(0);
+  opacity: 0;
+  pointer-events: none;
+  transition: transform 180ms ease-out, opacity 180ms ease-out;
+  touch-action: pan-y;
+}
+.info-dropdown[hidden] {
+  display: none;
+}
+.info-dropdown.is-open {
+  transform: scaleY(1);
+  opacity: 1;
+  pointer-events: auto;
+}
+.info-dropdown button {
+  width: 100%;
+  min-height: 2.75rem;
+  padding: .65rem .8rem;
+  border: 1px solid #c8d3ca;
+  border-radius: .55rem;
+  background: #fff;
+  color: inherit;
+  font: inherit;
+  text-align: left;
+  cursor: pointer;
+  touch-action: manipulation;
+}
+.info-dropdown button:hover {
+  background: #e6efdf;
+}
+.info-dropdown button:focus-visible {
+  outline: .2rem solid var(--primary-dark);
+  outline-offset: -.2rem;
+}
 
 .app-page > header:not(.has-back-button) h1 {
   padding-right: calc(var(--icon-button-size) + 1rem);