refactoring: converting all static commun paper objects (like backgrounds) into symbols for perf optimization

src/stores/common.js

@@ -1,10 +1,13 @@
 import { defineStore } from 'pinia'
 
+import paper from 'paper';
+
 export const CommonStore = defineStore({
   id: 'common',
   state: () => ({
     hover_elmt: null,
-    cartouch_width: 450
+    cartouch_width: 450,
+    paper_symbol_definitions: {}
   }),
   getters: {
     
@@ -14,6 +17,12 @@ export const CommonStore = defineStore({
       // console.log(`setHoverElmt`, elmt);
       // mode can be : terraindevie, proximite, superposition, puissancedagir, action, doleancer
       this.hover_elmt = elmt;
+    },
+    addPaperSymbolDefinition(name, path) {
+      console.log(`addPaperSymbolDefinition ${name}`, path);
+      // mode can be : terraindevie, proximite, superposition, puissancedagir, action, doleancer
+      this.paper_symbol_definitions[name] = new paper.SymbolDefinition(path);
     }
+
   }
 })