feat: add TypeScript lessons and learning panel

- Introduced a new script to check TypeScript lesson files for errors.
- Created a main TypeScript file to render lessons and their details.
- Added lesson definitions with starter and answer codes.
- Implemented a user interface for navigating and running lessons.
- Styled the application with CSS for a better user experience.
- Updated README to reflect the new TypeScript section and usage instructions.

06-typescript/scripts/check-lessons.mjs

@@ -0,0 +1,58 @@
+import { spawnSync } from "node:child_process";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const rootDir = path.resolve(__dirname, "..");
+const tscPath = path.join(rootDir, "node_modules", "typescript", "bin", "tsc");
+
+const lessonFiles = [
+  "01-js-vs-ts/starter.ts",
+  "01-js-vs-ts/answer.ts",
+  "02-basic-type-annotations/starter.ts",
+  "02-basic-type-annotations/answer.ts",
+  "03-array-and-function-types/starter.ts",
+  "03-array-and-function-types/answer.ts",
+  "04-interface-object-shape/starter.ts",
+  "04-interface-object-shape/answer.ts",
+  "05-generic-functions/starter.ts",
+  "05-generic-functions/answer.ts",
+  "06-union-and-optional-props/starter.ts",
+  "06-union-and-optional-props/answer.ts",
+  "07-type-safe-renderer/starter.ts",
+  "07-type-safe-renderer/answer.ts",
+  "08-final-mini-app/starter.ts",
+  "08-final-mini-app/answer.ts",
+];
+
+const sharedArgs = [
+  "--noEmit",
+  "--pretty",
+  "false",
+  "--target",
+  "ES2020",
+  "--module",
+  "ESNext",
+  "--moduleResolution",
+  "Bundler",
+  "--strict",
+  "--skipLibCheck",
+];
+
+for (const lessonFile of lessonFiles) {
+  const filePath = path.join(rootDir, lessonFile);
+
+  console.log(`Checking ${lessonFile}`);
+
+  const result = spawnSync(process.execPath, [tscPath, ...sharedArgs, filePath], {
+    cwd: rootDir,
+    stdio: "inherit",
+  });
+
+  if (result.status !== 0) {
+    process.exit(result.status ?? 1);
+  }
+}
+
+console.log("All lesson files passed TypeScript checks.");