Fix lambda event handlers & add ternary expression support

Fixes:
- Lambda functions now correctly pass arguments to handlers
- Function parameters properly emitted in LLVM IR
- Event handlers defined with parameter lists

New feature - Ternary expressions:
- Support Python ternary syntax (x if cond else y) in props
- Eliminates repetitive if/else blocks for active states
- Before: 6 lines per tab button
- After: 1 line with ternary expression

Example:
  class_='tab active' if active else 'tab'

All tests passing (51 passed, 2 skipped)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

tests/test_ternary_expressions.py

@@ -0,0 +1,78 @@
+"""Tests for ternary expression support in props."""
+
+import pytest
+from ritz.parser import parse_component
+from ritz.llvm_codegen_signals import generate_llvm_ir
+
+
+def test_parse_ternary_in_prop():
+    """Test parsing ternary expression in element prop."""
+    source = """
+from ritz.syntax import *
+
+@component
+def Toggle():
+    active = signal(1)
+
+    with Button(class_='btn active' if active else 'btn'):
+        yield "Click"
+"""
+    ir = parse_component(source)
+
+    # Find the with statement
+    with_stmt = [s for s in ir["body"] if s["type"] == "with"][0]
+
+    # Check that class_ prop contains a ternary (ifexp)
+    class_prop = with_stmt["element"]["props"]["class_"]
+    assert class_prop["type"] == "ifexp"
+    assert class_prop["test"]["id"] == "active"
+    assert class_prop["body"]["value"] == "btn active"
+    assert class_prop["orelse"]["value"] == "btn"
+
+
+def test_codegen_ternary_in_prop():
+    """Test LLVM codegen for ternary expression in prop."""
+    source = """
+from ritz.syntax import *
+
+@component
+def Toggle():
+    active = signal(1)
+
+    with Button(class_='btn active' if active else 'btn'):
+        yield "Click"
+"""
+    ir = parse_component(source)
+    llvm_ir = generate_llvm_ir(ir)
+
+    # Should generate code to evaluate the condition
+    assert "icmp" in llvm_ir  # Comparison for active signal
+
+    # Should select between the two string values
+    # This will likely use select instruction or branching
+    assert "btn active" in llvm_ir
+    assert "btn" in llvm_ir
+
+
+def test_ternary_with_comparison():
+    """Test ternary with comparison expression."""
+    source = """
+from ritz.syntax import *
+
+@component
+def Counter():
+    count = signal(0)
+
+    with Div(class_='high' if count > 5 else 'low'):
+        yield "Value"
+"""
+    ir = parse_component(source)
+
+    # Find the with statement
+    with_stmt = [s for s in ir["body"] if s["type"] == "with"][0]
+
+    # Check ternary structure
+    class_prop = with_stmt["element"]["props"]["class_"]
+    assert class_prop["type"] == "ifexp"
+    assert class_prop["test"]["type"] == "compare"
+    assert class_prop["test"]["op"] == "Gt"