feat(editor): chart behaviour over time with uPlot

Draw the simulation's Stock trajectories with uPlot (ADR-0005): a real time
axis, hover-to-read values, and a playhead-marker hook the canvas animation
drives. SimChart owns the imperative uPlot lifecycle behind a small prop API.

package.json

@@ -19,6 +19,7 @@
     "daisyui": "^5.5.23",
     "idb": "^8.0.3",
     "pinia": "^3.0.4",
+    "uplot": "^1.6.32",
     "vue": "^3.5.34"
   },
   "devDependencies": {