Enhance Conway's Game of Life UI & interaction

Add interactive controls and drawing support for Conway's Game of Life: introduce Node.alive, Scenario enum, spawn/speed/time constants, random/empty generation, and mouse/touch drawing (click-drag/touch to toggle cells). Update template to include control buttons, speed input, legend, and expose Scenario constants. Implement grid initialization, random seeding, grid position mapping, and optimized node drawing/color logic.

Also update i18n (de/en) with GOL strings and move GRID label keys to ALGORITHM, switch some label usages accordingly. Move generic container/legend styles into global styles.scss (adjust canvas border color), and simplify component SCSS files. Change CONWAYS_WIKI URL to German wiki and remove now-unused UrlConstants references from components.

src/styles.scss

@@ -213,6 +213,11 @@ a {
 }
 
 // algos
+
+.container {
+  padding: 2rem;
+}
+
 .algo-info {
   margin: 0 0 1rem 0;
   padding: 0.75rem 1rem;
@@ -248,7 +253,38 @@ a {
 }
 
 canvas {
-  border: 1px solid #ccc;
+  border: 1px solid lightgray;
   display: block;
   max-width: 100%;
 }
+
+.legend {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 1rem;
+  align-items: center;
+  font-size: 0.9em;
+
+  .legend-color {
+    display: inline-block;
+    width: 15px;
+    height: 15px;
+    border: 1px solid lightgray;
+    vertical-align: middle;
+    margin-right: 5px;
+
+    &.start { background-color: green; }
+    &.end { background-color: red; }
+    &.wall { background-color: black; }
+    &.visited { background-color: skyblue; }
+    &.path { background-color: gold; }
+    &.empty { background-color: lightgray; }
+    &.alive { background-color: black; }
+  }
+}
+
+.controls-container {
+  display: flex;
+  flex-direction: column;
+  margin-bottom: 1rem;
+}