feat: implement Figlet, Pastel, and Unit tools with a unified layout

- Add Figlet text converter with font selection and history
- Add Pastel color palette generator and manipulation suite
- Add comprehensive Units converter with category-based logic
- Introduce AppShell with Sidebar and Header for navigation
- Modernize theme system with CSS variables and new animations
- Update project configuration and dependencies

app/api/fonts/route.ts

@@ -0,0 +1,29 @@
+import { NextResponse } from 'next/server';
+import fs from 'fs';
+import path from 'path';
+
+export const dynamic = 'force-static';
+
+export async function GET() {
+  try {
+    const fontsDir = path.join(process.cwd(), 'public/fonts/figlet-fonts');
+    const files = fs.readdirSync(fontsDir);
+
+    const fonts = files
+      .filter(file => file.endsWith('.flf'))
+      .map(file => {
+        const name = file.replace('.flf', '');
+        return {
+          name,
+          fileName: file,
+          path: `/fonts/figlet-fonts/${file}`,
+        };
+      })
+      .sort((a, b) => a.name.localeCompare(b.name));
+
+    return NextResponse.json(fonts);
+  } catch (error) {
+    console.error('Error reading fonts directory:', error);
+    return NextResponse.json({ error: 'Failed to load fonts' }, { status: 500 });
+  }
+}