Feat/initial plan (#6)

* chore: upgrade libs

* fix outdated tests

* init edit steps form

* tasks have now initialPlan

* simpler to directly have an history and put initialPlan and steps has getters

* consistent test script names

* display initial plan to task view

* display initial if only it exists (next when only it changes

* display initial plan only if it chanegd

vitest.config.ts

@@ -1,7 +1,7 @@
 import { fileURLToPath } from 'node:url'
 import { mergeConfig } from 'vite'
 import { configDefaults, defineConfig } from 'vitest/config'
-import viteConfig from './vite.config'
+import viteConfig from './vite.config.mjs'
 
 export default mergeConfig(
   viteConfig,