test: add LSP integration test file

Add test file with comprehensive examples to verify TypeScript language
server integration. File includes tests for:
- Code completion
- Hover information
- Error detection
- Function parameter hints
- Jump to definition
- Type inference
- JSDoc support

This file can be opened in Phoenix to manually verify all LSP features
are working correctly.

Author: claude

test-lsp.js

@@ -0,0 +1,71 @@
+// Test file for TypeScript LSP
+// Open this file in Phoenix to test LSP features
+
+// Test 1: Code Completion
+// Type the dot after 'arr' and press Ctrl+Space
+// You should see array methods: map, filter, reduce, etc.
+const arr = [1, 2, 3, 4, 5];
+arr
+
+// Test 2: Hover Information
+// Hover your mouse over variables to see their types
+const name = "Phoenix";
+const count = 42;
+const isActive = true;
+
+// Test 3: Error Detection
+// This should show a red squiggle (undefined variable)
+// Uncomment to test:
+// const result = undefinedVariable;
+
+// Test 4: Function Parameter Hints
+// Type the opening parenthesis and you should see parameter info
+function greet(firstName, lastName, age) {
+    return `Hello ${firstName} ${lastName}, age ${age}`;
+}
+
+// Type: greet( and you should see parameter hints
+greet
+
+// Test 5: Jump to Definition
+// Right-click on 'greet' below and select "Go to Definition"
+// It should jump to the function definition above
+const message = greet("John", "Doe", 30);
+
+// Test 6: Object Property Completion
+// Type the dot after 'person' and press Ctrl+Space
+const person = {
+    name: "Alice",
+    age: 25,
+    email: "[email protected]"
+};
+person
+
+// Test 7: String Methods
+// Type the dot after 'str' and press Ctrl+Space
+const str = "Hello World";
+str
+
+// Test 8: Import Suggestions (if you have other files)
+// Type: import { } from './
+// You should see file suggestions
+
+// Test 9: Type Inference
+// Hover over 'numbers' - it should show: number[]
+const numbers = [1, 2, 3].map(n => n * 2);
+
+// Test 10: JSDoc Support
+/**
+ * Calculates the sum of two numbers
+ * @param {number} a - First number
+ * @param {number} b - Second number
+ * @returns {number} The sum
+ */
+function add(a, b) {
+    return a + b;
+}
+
+// Type: add( and you should see the JSDoc information
+add
+
+console.log("If you see LSP features working, the integration is successful! 🎉");