feat: add testing and refactor dropdown component

- Added vitest for testing with watch mode and setup files.
- Refactored DropdownItem to support keyboard interactions and improved submenu handling.
- Updated Snippets component to replace CSSSnippets.
- Removed unused files and optimized imports across various components.
- Enhanced file format detection utility to support various image formats.

Author: BluePixelDev

.gitignore

@@ -22,3 +22,5 @@ dist-ssr
 *.njsproj
 *.sln
 *.sw?
+
+*storybook.log

.ladle/components.tsx

@@ -0,0 +1,16 @@
+
+import "../src/App.css"
+import type { StoryDefault } from "@ladle/react"
+import React from "react"
+import { Provider } from 'react-redux'
+import { store } from "../src/store"
+
+export default {
+    decorators: [
+        (Story: React.FC) => (
+            <Provider store={store}>
+                <Story />
+            </Provider>
+        )
+    ]
+} satisfies StoryDefault