fix: SpireTab store props, mana regen display, skill cost deduction, grimoire cost format, unequip store, add test suite

vitest.config.ts

@@ -1,4 +1,5 @@
 import { defineConfig } from 'vitest/config';
+import path from 'path';
 
 export default defineConfig({
   test: {
@@ -14,4 +15,9 @@ export default defineConfig({
       ],
     },
   },
+  resolve: {
+    alias: {
+      '@': path.resolve(__dirname, './src'),
+    },
+  },
 });