Remove obsolete tests and add new login page layout

- Deleted test files for NavLink, Navbar, NavbarBrand, Progress, Row, SearchBar, Select, Spinner, Textarea, and a basic test for Button.
- Introduced a new EmptyLayout component for consistent layout structure.
- Added a new login page with a layout that includes a login form and an ASCII art header.
- Updated CSS variables for improved styling consistency across components.
- Removed Vitest configuration file as it is no longer needed.

package.json

@@ -1,26 +1,22 @@
 {
-	"name": "nixi-web",
-	"type": "module",
-	"version": "0.0.1",
-	"scripts": {
-		"dev": "bunx --bun astro dev",
-		"build": "bunx --bun astro build",
-		"preview": "bunx --bun astro preview",
-		"astro": "bunx --bun astro",
-		"test": "vitest run",
-		"test:watch": "vitest",
-		"test:ui": "vitest --ui"
-	},
-	"dependencies": {
-		"@astrojs/node": "^9.3.1",
-		"astro": "^5.12.6"
-	},
-	"devDependencies": {
-		"@biomejs/biome": "2.1.3",
-		"@testing-library/dom": "^10.4.1",
-		"@types/bun": "^1.2.19",
-		"@vitest/ui": "^3.2.4",
-		"happy-dom": "^18.0.1",
-		"vitest": "^3.2.4"
-	}
+  "name": "nixi-web",
+  "type": "module",
+  "version": "0.0.1",
+  "scripts": {
+    "dev": "astro dev",
+    "build": "astro build",
+    "preview": "astro preview",
+    "astro": "astro",
+    "lint": "oxlint ."
+  },
+  "dependencies": {
+    "@astrojs/node": "^9.3.1",
+    "astro": "^5.12.6"
+  },
+  "devDependencies": {
+    "@prettier/plugin-oxc": "^0.0.4",
+    "@types/bun": "^1.2.19",
+    "oxlint": "^1.11.0",
+    "prettier": "3.6.2"
+  }
 }