refactor rect selection to make it work in shares

frontend/stores/selectionRect.ts

@@ -1,6 +1,9 @@
+import type { SelectionMode } from '~/shared/types/selection';
+
 export const useSelectionRect = defineStore('selection-rect', {
     state: () => ({
         enabled: false as boolean,
+        dirty: false as boolean,
         a: {
             x: 0 as number,
             y: 0 as number,
@@ -9,9 +12,14 @@ export const useSelectionRect = defineStore('selection-rect', {
             x: 0 as number,
             y: 0 as number,
         },
+        mode: 'set' as SelectionMode,
     }),
     actions: {
-        set(a: { x: number; y: number }, b: { x: number; y: number }) {
+        set(
+            a: { x: number; y: number },
+            b: { x: number; y: number },
+            mode: SelectionMode
+        ) {
             this.a.x = a.x;
             this.a.y = a.y;
 
@@ -19,6 +27,7 @@ export const useSelectionRect = defineStore('selection-rect', {
             this.b.y = b.y;
 
             this.enabled = true;
+            this.mode = mode;
         },
         updateB(x: number, y: number) {
             this.b.x = x;