Fix: creating a dir ending with .kcl panics the app (#7099)

* Fix: creating a dir ending with .kcl panics the app
Fixes #7082

* Update snapshots

* Update snapshots

* Add test

* tag: ['@electron', '@macos', '@windows']

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Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

e2e/playwright/test-utils.ts

@@ -557,6 +557,14 @@ export async function getUtils(page: Page, test_?: typeof test) {
       })
     },
 
+    createNewFolder: async (name: string) => {
+      return test?.step(`Create a folder named ${name}`, async () => {
+        await page.getByTestId('create-folder-button').click()
+        await page.getByTestId('tree-input-field').fill(name)
+        await page.keyboard.press('Enter')
+      })
+    },
+
     cloneFile: async (name: string) => {
       return test?.step(`Cloning file '${name}'`, async () => {
         await page