feat: sentence trainer prototype

feat: layout learner prototype

src/lib/components/layout/KeyText.svelte

@@ -11,6 +11,9 @@
   const { fontSize, margin, inactiveOpacity, inactiveScale, iconFontSize } =
     getContext<VisualLayoutConfig>("visual-layout-config");
   const activeLayer = getContext<Writable<number>>("active-layer");
+  const currentAction = getContext<Writable<Set<number>> | undefined>(
+    "highlight-action",
+  );
 
   let {
     key,
@@ -47,6 +50,7 @@
   ]}
   {@const hasIcon = !dynamicMapping && !!icon}
   <text
+    class:hidden={$currentAction?.has(actionId) === false}
     fill={isApplied ? "currentcolor" : "var(--md-sys-color-primary)"}
     font-weight={isApplied ? "" : "bold"}
     text-anchor="middle"
@@ -96,4 +100,8 @@
   text:focus-within {
     outline: none;
   }
+
+  text.hidden {
+    opacity: 0.2;
+  }
 </style>

src/lib/components/layout/KeyboardKey.svelte

@@ -8,11 +8,14 @@
     KeyboardEventHandler,
     MouseEventHandler,
   } from "svelte/elements";
+  import { type Writable } from "svelte/store";
 
   const { scale, margin, strokeWidth } = getContext<VisualLayoutConfig>(
     "visual-layout-config",
   );
 
+  const highlight = getContext<Writable<Set<number>> | undefined>("highlight");
+
   let {
     i,
     key,
@@ -35,6 +38,8 @@
 
 <g
   class="key-group"
+  class:highlight={$highlight?.has(key.id) === true}
+  class:faded={$highlight?.has(key.id) === false}
   {onclick}
   {onkeypress}
   {onfocusin}
@@ -131,12 +136,14 @@
     stroke-opacity: 0.3;
   }
 
+  g.faded,
   g:hover {
     cursor: default;
     opacity: 0.6;
     transition: opacity #{$transition} ease;
   }
 
+  g.highlight,
   g:focus-within {
     color: var(--md-sys-color-primary);
     outline: none;