Add Prim/Kruskal maze gen & nodeData refactor

Implement Prim and Kruskal maze generation in the Labyrinth component with animated generation and UI guards. Introduces isAnimationRunning signal, mazeAnimationSpeed, maze node order tracking and animateMazeGeneration; createRandom(now takes a boolean) triggers either Prim or Kruskal flow, sets random start/end, and animates. Refactor Node.distance -> nodeData across models, components and the PathfindingService (Dijkstra/A*) to use nodeData for g-scores/ids. Add SharedFunctions.shuffleArray utility and update i18n (EN/DE) with labels for Prim/Kruskal. Misc: minor cleanup/init changes and drawing logic adjustments to support the new maze flows.

src/assets/i18n/en.json

@@ -363,6 +363,8 @@
   },
   "LABYRINTH": {
     "TITLE": "Labyrinth Generation",
+    "PRIM": "Generate Prim's Labyrinth",
+    "KRUSKAL": "Generate Kruskal's Labyrinth",
     "EXPLANATION": {
       "TITLE": "Algorithms",
       "PRIM_EXPLANATION": "starts at a random point and expands the labyrinth by always selecting a random neighboring wall of an already visited cell and opening it. Advantage: Produces very uniform, natural-looking labyrinths with many short dead ends. Visually, it appears like organic growth from a central point.",