diff --git a/frontend/.gitignore b/.gitignore
similarity index 100%
rename from frontend/.gitignore
rename to .gitignore
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index c7b1d1f..4bbc33e 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -5,12 +5,39 @@
   </component>
   <component name="ChangeListManager">
     <list default="true" id="58b952d2-2253-4e80-8b30-0eef029dc0b0" name="Changes" comment="Implemented basic app with Mantine SegmentedControl">
+      <change beforePath="$PROJECT_DIR$/.idea/vcs.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/vcs.xml" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/frontend/package-lock.json" beforeDir="false" afterPath="$PROJECT_DIR$/frontend/package-lock.json" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/frontend/package.json" beforeDir="false" afterPath="$PROJECT_DIR$/frontend/package.json" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/frontend/src/App.tsx" beforeDir="false" afterPath="$PROJECT_DIR$/frontend/src/App.tsx" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/frontend/src/index.css" beforeDir="false" afterPath="$PROJECT_DIR$/frontend/src/index.css" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/frontend/vite.config.ts" beforeDir="false" afterPath="$PROJECT_DIR$/frontend/vite.config.ts" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/README.md" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/backend/.gitignore" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/backend/package-lock.json" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/backend/package.json" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/backend/src/index.ts" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/backend/tsconfig.json" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/frontend/.gitignore" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/frontend/README.md" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/frontend/eslint.config.js" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/frontend/index.html" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/frontend/package-lock.json" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/frontend/package.json" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/frontend/postcss.config.cjs" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/frontend/public/favicon.svg" beforeDir="false" afterPath="$PROJECT_DIR$/public/favicon.svg" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/frontend/public/icons.svg" beforeDir="false" afterPath="$PROJECT_DIR$/public/icons.svg" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/frontend/src/App.tsx" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/frontend/src/assets/hero.png" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/frontend/src/assets/react.svg" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/frontend/src/assets/vite.svg" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/frontend/src/index.css" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/frontend/src/main.tsx" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/frontend/tsconfig.app.json" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/frontend/tsconfig.json" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/frontend/tsconfig.node.json" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/frontend/vite.config.ts" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/../zkpa4fs_qt/.gitignore" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/../zkpa4fs_qt/CMakeLists.txt" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/../zkpa4fs_qt/main.cpp" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/../zkpa4fs_qt/mainwindow.cpp" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/../zkpa4fs_qt/mainwindow.h" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/../zkpa4fs_qt/mainwindow.ui" beforeDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -29,23 +56,23 @@
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+      <entry key="MS500" value="1.0009539537566359" />
+      <entry key="S2" value="1.2110570062864665" />
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@@ -67,23 +94,23 @@
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+      <entry key="W1" value="24.999388589964713" />
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   </component>
   <component name="ProjectColorInfo">{
@@ -105,7 +132,7 @@
     "codeWithMe.voiceChat.enabledByDefault": "false",
     "git-widget-placeholder": "main",
     "javascript.preferred.runtime.type.id": "node",
-    "last_opened_file_path": "/home/tobias/Projects/Work-Tracker",
+    "last_opened_file_path": "C:/Users/t.landgraf/GitProjects/work_tracker",
     "node.js.detected.package.eslint": "true",
     "node.js.detected.package.jshint": "true",
     "node.js.detected.package.tslint": "true",
@@ -115,18 +142,18 @@
     "nodejs_package_manager_path": "npm",
     "npm.dev.executor": "Run",
     "settings.editor.selected.configurable": "preferences.keymap",
-    "ts.external.directory.path": "/home/tobias/.local/share/JetBrains/Toolbox/apps/webstorm/plugins/javascript-plugin/jsLanguageServicesImpl/external"
+    "ts.external.directory.path": "C:\\Users\\t.landgraf\\AppData\\Local\\Programs\\WebStorm\\plugins\\javascript-plugin\\jsLanguageServicesImpl\\external"
   }
 }]]></component>
   <component name="RecentsManager">
     <key name="MoveFile.RECENT_KEYS">
-      <recent name="C:\Users\t.landgraf\GitProjects\work_tracker\frontend" />
       <recent name="C:\Users\t.landgraf\GitProjects\work_tracker" />
+      <recent name="C:\Users\t.landgraf\GitProjects\work_tracker\frontend" />
     </key>
   </component>
   <component name="RunManager">
     <configuration name="dev" type="js.build_tools.npm" temporary="true" nameIsGenerated="true">
-      <package-json value="$PROJECT_DIR$/frontend/package.json" />
+      <package-json value="$PROJECT_DIR$/package.json" />
       <command value="run" />
       <scripts>
         <script value="dev" />
diff --git a/README.md b/README.md
index e69de29..a00d0dd 100644
--- a/README.md
+++ b/README.md
@@ -0,0 +1,77 @@
+# React + TypeScript + Vite
+
+This template provides a minimal setup to get React working in Vite with HMR and some ESLint rules.
+
+Currently, two official plugins are available:
+
+- [@vitejs/plugin-react](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react) uses [Oxc](https://oxc.rs)
+- [@vitejs/plugin-react-swc](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react-swc) uses [SWC](https://swc.rs/)
+
+## React Compiler
+
+The React Compiler is enabled on this template. See [this documentation](https://react.dev/learn/react-compiler) for more information.
+
+Note: This will impact Vite dev & build performances.
+
+## Expanding the ESLint configuration
+
+If you are developing a production application, we recommend updating the configuration to enable type-aware lint rules:
+
+```js
+export default defineConfig([
+  globalIgnores(['dist']),
+  {
+    files: ['**/*.{ts,tsx}'],
+    extends: [
+      // Other configs...
+
+      // Remove tseslint.configs.recommended and replace with this
+      tseslint.configs.recommendedTypeChecked,
+      // Alternatively, use this for stricter rules
+      tseslint.configs.strictTypeChecked,
+      // Optionally, add this for stylistic rules
+      tseslint.configs.stylisticTypeChecked,
+
+      // Other configs...
+    ],
+    languageOptions: {
+      parserOptions: {
+        project: ['./tsconfig.node.json', './tsconfig.app.json'],
+        tsconfigRootDir: import.meta.dirname,
+      },
+      // other options...
+    },
+  },
+])
+
+```
+
+You can also install [eslint-plugin-react-x](https://github.com/Rel1cx/eslint-react/tree/main/packages/plugins/eslint-plugin-react-x) and [eslint-plugin-react-dom](https://github.com/Rel1cx/eslint-react/tree/main/packages/plugins/eslint-plugin-react-dom) for React-specific lint rules:
+
+```js
+// eslint.config.js
+import reactX from 'eslint-plugin-react-x'
+import reactDom from 'eslint-plugin-react-dom'
+
+export default defineConfig([
+  globalIgnores(['dist']),
+  {
+    files: ['**/*.{ts,tsx}'],
+    extends: [
+      // Other configs...
+      // Enable lint rules for React
+      reactX.configs['recommended-typescript'],
+      // Enable lint rules for React DOM
+      reactDom.configs.recommended,
+    ],
+    languageOptions: {
+      parserOptions: {
+        project: ['./tsconfig.node.json', './tsconfig.app.json'],
+        tsconfigRootDir: import.meta.dirname,
+      },
+      // other options...
+    },
+  },
+])
+
+```
diff --git a/backend/.gitignore b/backend/.gitignore
deleted file mode 100644
index 6acd432..0000000
--- a/backend/.gitignore
+++ /dev/null
@@ -1,4 +0,0 @@
-node_modules
-*.js
-dist
-.idea/
\ No newline at end of file
diff --git a/backend/package-lock.json b/backend/package-lock.json
deleted file mode 100644
index 8697b19..0000000
--- a/backend/package-lock.json
+++ /dev/null
@@ -1,1528 +0,0 @@
-{
-  "name": "work_tracker_backend",
-  "version": "1.0.0",
-  "lockfileVersion": 3,
-  "requires": true,
-  "packages": {
-    "": {
-      "name": "work_tracker_backend",
-      "version": "1.0.0",
-      "license": "ISC",
-      "dependencies": {
-        "express": "^5.2.1"
-      },
-      "devDependencies": {
-        "@types/express": "^5.0.6",
-        "@types/node": "^26.1.2",
-        "nodemon": "^3.1.14",
-        "ts-node": "^10.9.2",
-        "typescript": "^5.9.2"
-      }
-    },
-    "node_modules/@cspotcode/source-map-support": {
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-      "resolved": "https://registry.npmjs.org/@cspotcode/source-map-support/-/source-map-support-0.8.1.tgz",
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-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@jridgewell/trace-mapping": "0.3.9"
-      },
-      "engines": {
-        "node": ">=12"
-      }
-    },
-    "node_modules/@jridgewell/resolve-uri": {
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-      "license": "MIT",
-      "engines": {
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-    "node_modules/@jridgewell/sourcemap-codec": {
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diff --git a/backend/package.json b/backend/package.json
deleted file mode 100644
index 4a8aaa6..0000000
--- a/backend/package.json
+++ /dev/null
@@ -1,25 +0,0 @@
-{
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-  "version": "1.0.0",
-  "description": "",
-  "main": "index.js",
-  "scripts": {
-    "build": "tsc",
-    "start": "node dist/index.js",
-    "dev": "nodemon --exec ts-node src/index.ts"
-  },
-  "keywords": [],
-  "author": "",
-  "license": "ISC",
-  "type": "module",
-  "dependencies": {
-    "express": "^5.2.1"
-  },
-  "devDependencies": {
-    "@types/express": "^5.0.6",
-    "@types/node": "^26.1.2",
-    "nodemon": "^3.1.14",
-    "ts-node": "^10.9.2",
-    "typescript": "^5.9.2"
-  }
-}
diff --git a/backend/src/index.ts b/backend/src/index.ts
deleted file mode 100644
index 794d435..0000000
--- a/backend/src/index.ts
+++ /dev/null
@@ -1,15 +0,0 @@
-import express from 'express';
-import type { Request, Response } from 'express';
-
-const app = express();
-const PORT = process.env.PORT || 3000;
-
-app.use(express.json());
-
-app.get('/', (req: Request, res: Response) => {
-	res.json({ message: 'Hello from Express TypeScript!' });
-});
-
-app.listen(PORT, () => {
-	console.log(`Server running at http://localhost:${PORT}`);
-});
\ No newline at end of file
diff --git a/backend/tsconfig.json b/backend/tsconfig.json
deleted file mode 100644
index cec4a3a..0000000
--- a/backend/tsconfig.json
+++ /dev/null
@@ -1,44 +0,0 @@
-{
-  // Visit https://aka.ms/tsconfig to read more about this file
-  "compilerOptions": {
-    // File Layout
-    // "rootDir": "./src",
-    // "outDir": "./dist",
-
-    // Environment Settings
-    // See also https://aka.ms/tsconfig/module
-    "module": "nodenext",
-    "target": "esnext",
-    "types": [],
-    // For nodejs:
-    // "lib": ["esnext"],
-    // "types": ["node"],
-    // and npm install -D @types/node
-
-    // Other Outputs
-    "sourceMap": true,
-    "declaration": true,
-    "declarationMap": true,
-
-    // Stricter Typechecking Options
-    "noUncheckedIndexedAccess": true,
-    "exactOptionalPropertyTypes": true,
-
-    // Style Options
-    // "noImplicitReturns": true,
-    // "noImplicitOverride": true,
-    // "noUnusedLocals": true,
-    // "noUnusedParameters": true,
-    // "noFallthroughCasesInSwitch": true,
-    // "noPropertyAccessFromIndexSignature": true,
-
-    // Recommended Options
-    "strict": true,
-    "jsx": "react-jsx",
-    "verbatimModuleSyntax": true,
-    "isolatedModules": true,
-    "noUncheckedSideEffectImports": true,
-    "moduleDetection": "force",
-    "skipLibCheck": true,
-  }
-}
diff --git a/frontend/eslint.config.js b/eslint.config.js
similarity index 100%
rename from frontend/eslint.config.js
rename to eslint.config.js
diff --git a/frontend/README.md b/frontend/README.md
deleted file mode 100644
index a00d0dd..0000000
--- a/frontend/README.md
+++ /dev/null
@@ -1,77 +0,0 @@
-# React + TypeScript + Vite
-
-This template provides a minimal setup to get React working in Vite with HMR and some ESLint rules.
-
-Currently, two official plugins are available:
-
-- [@vitejs/plugin-react](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react) uses [Oxc](https://oxc.rs)
-- [@vitejs/plugin-react-swc](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react-swc) uses [SWC](https://swc.rs/)
-
-## React Compiler
-
-The React Compiler is enabled on this template. See [this documentation](https://react.dev/learn/react-compiler) for more information.
-
-Note: This will impact Vite dev & build performances.
-
-## Expanding the ESLint configuration
-
-If you are developing a production application, we recommend updating the configuration to enable type-aware lint rules:
-
-```js
-export default defineConfig([
-  globalIgnores(['dist']),
-  {
-    files: ['**/*.{ts,tsx}'],
-    extends: [
-      // Other configs...
-
-      // Remove tseslint.configs.recommended and replace with this
-      tseslint.configs.recommendedTypeChecked,
-      // Alternatively, use this for stricter rules
-      tseslint.configs.strictTypeChecked,
-      // Optionally, add this for stylistic rules
-      tseslint.configs.stylisticTypeChecked,
-
-      // Other configs...
-    ],
-    languageOptions: {
-      parserOptions: {
-        project: ['./tsconfig.node.json', './tsconfig.app.json'],
-        tsconfigRootDir: import.meta.dirname,
-      },
-      // other options...
-    },
-  },
-])
-
-```
-
-You can also install [eslint-plugin-react-x](https://github.com/Rel1cx/eslint-react/tree/main/packages/plugins/eslint-plugin-react-x) and [eslint-plugin-react-dom](https://github.com/Rel1cx/eslint-react/tree/main/packages/plugins/eslint-plugin-react-dom) for React-specific lint rules:
-
-```js
-// eslint.config.js
-import reactX from 'eslint-plugin-react-x'
-import reactDom from 'eslint-plugin-react-dom'
-
-export default defineConfig([
-  globalIgnores(['dist']),
-  {
-    files: ['**/*.{ts,tsx}'],
-    extends: [
-      // Other configs...
-      // Enable lint rules for React
-      reactX.configs['recommended-typescript'],
-      // Enable lint rules for React DOM
-      reactDom.configs.recommended,
-    ],
-    languageOptions: {
-      parserOptions: {
-        project: ['./tsconfig.node.json', './tsconfig.app.json'],
-        tsconfigRootDir: import.meta.dirname,
-      },
-      // other options...
-    },
-  },
-])
-
-```
diff --git a/frontend/index.html b/index.html
similarity index 100%
rename from frontend/index.html
rename to index.html
diff --git a/frontend/package-lock.json b/package-lock.json
similarity index 100%
rename from frontend/package-lock.json
rename to package-lock.json
diff --git a/frontend/package.json b/package.json
similarity index 100%
rename from frontend/package.json
rename to package.json
diff --git a/frontend/postcss.config.cjs b/postcss.config.cjs
similarity index 100%
rename from frontend/postcss.config.cjs
rename to postcss.config.cjs
diff --git a/frontend/public/favicon.svg b/public/favicon.svg
similarity index 100%
rename from frontend/public/favicon.svg
rename to public/favicon.svg
diff --git a/frontend/public/icons.svg b/public/icons.svg
similarity index 100%
rename from frontend/public/icons.svg
rename to public/icons.svg
diff --git a/frontend/src/App.tsx b/src/App.tsx
similarity index 54%
rename from frontend/src/App.tsx
rename to src/App.tsx
index f4cde50..6aa6cde 100644
--- a/frontend/src/App.tsx
+++ b/src/App.tsx
@@ -4,50 +4,37 @@ import * as React from 'react';
 
 type Workday = 'Monday' | 'Tuesday' | 'Wednesday' | 'Thursday' | 'Friday';
 
+const toMinutes = (time: string): number | null => {
+    const match = /^(\d{2}):(\d{2})$/.exec(time);
+    if (!match) return null;
+    return Number(match[1]) * 60 + Number(match[2]);
+};
+
+const fromMinutes = (mins: number): string => {
+    const h = Math.floor(mins / 60) % 24;
+    const m = mins % 60;
+    return `${String(h).padStart(2, '0')}:${String(m).padStart(2, '0')}`;
+};
+
 function App() {
     const [selectedDay, setSelectedDay] = React.useState<Workday>('Monday');
-    const [workStart, setWorkStart] = React.useState<Date | null>(null);
-    const [workEnd, setWorkEnd] = React.useState<Date | null>(null);
+    const [workStart, setWorkStart] = React.useState<string>('');
+    const [workEnd, setWorkEnd] = React.useState<string>('');
     const [breakMins, setBreakMins] = React.useState<number>(0);
     const [workedHrs, setWorkedHrs] = React.useState<number>(0);
 
-    const getHourDiff = (): number => {
-        // FIX: Ensure both dates are valid before calculating
-        if (!workStart || !workEnd || isNaN(workStart.getTime()) || isNaN(workEnd.getTime())) {
-            return 0;
-        }
+    const getHourDiff = () => {
+        const start = toMinutes(workStart);
+        const end = toMinutes(workEnd);
+        if (start === null || end === null) return 0;
+        return (end - start) / 60 - breakMins / 60;
+    }
 
-        let startMs = workStart.getTime();
-        let endMs = workEnd.getTime();
-
-        let diffMs = endMs - startMs;
-
-        if (diffMs < 0) {
-            diffMs += 24 * 60 * 60 * 1000;
-        }
-
-        const breakMs = breakMins * 60 * 1000;
-        const netMs = diffMs - breakMs;
-
-        return netMs / (1000 * 60 * 60);
-    };
-
-    const getWorkEndTime = (): string => {
-        // FIX: Ensure workStart is valid
-        if (!workStart || !workEnd) return 0;
-        if (!workStart || isNaN(workStart.getTime())) return '--:--';
-
-        const targetDate = new Date(workStart);
-        const additionalTimeMs = (8 * 60 * 60 * 1000) + (breakMins * 60 * 1000);
-        targetDate.setTime(targetDate.getTime() + additionalTimeMs);
-
-        // FIX: Check if result is valid before formatting
-        if (isNaN(targetDate.getTime())) return '--:--';
-
-        const hours = targetDate.getHours().toString().padStart(2, '0');
-        const minutes = targetDate.getMinutes().toString().padStart(2, '0');
-        return `${hours}:${minutes}`;
-    };
+    const getWorkEndTime = () => {
+        const start = toMinutes(workStart);
+        if (start === null) return '—';
+        return fromMinutes(start + 8 * 60 + breakMins);
+    }
 
     return (
         <Center>
@@ -55,8 +42,8 @@ function App() {
                 <SegmentedControl
                     data={['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday']}
                     onChange={(value) => {
-                        setWorkStart(null);
-                        setWorkEnd(null);
+                        setWorkStart('');
+                        setWorkEnd('');
                         setSelectedDay(value as Workday);
                     }}
                     className={"mt-2"}
@@ -92,4 +79,4 @@ function App() {
     );
 }
 
-export default App;
\ No newline at end of file
+export default App;
diff --git a/frontend/src/assets/hero.png b/src/assets/hero.png
similarity index 100%
rename from frontend/src/assets/hero.png
rename to src/assets/hero.png
diff --git a/frontend/src/assets/react.svg b/src/assets/react.svg
similarity index 100%
rename from frontend/src/assets/react.svg
rename to src/assets/react.svg
diff --git a/frontend/src/assets/vite.svg b/src/assets/vite.svg
similarity index 100%
rename from frontend/src/assets/vite.svg
rename to src/assets/vite.svg
diff --git a/frontend/src/index.css b/src/index.css
similarity index 100%
rename from frontend/src/index.css
rename to src/index.css
diff --git a/frontend/src/main.tsx b/src/main.tsx
similarity index 100%
rename from frontend/src/main.tsx
rename to src/main.tsx
diff --git a/frontend/tsconfig.app.json b/tsconfig.app.json
similarity index 100%
rename from frontend/tsconfig.app.json
rename to tsconfig.app.json
diff --git a/frontend/tsconfig.json b/tsconfig.json
similarity index 100%
rename from frontend/tsconfig.json
rename to tsconfig.json
diff --git a/frontend/tsconfig.node.json b/tsconfig.node.json
similarity index 100%
rename from frontend/tsconfig.node.json
rename to tsconfig.node.json
diff --git a/frontend/vite.config.ts b/vite.config.ts
similarity index 100%
rename from frontend/vite.config.ts
rename to vite.config.ts