fix: ANTLR parser interaction parameter passing

- Fixed callback argument parsing for empty parentheses: callback() now correctly passes undefined instead of empty string
- Fixed tooltip parsing for call patterns: click A call callback() "tooltip" now correctly extracts tooltip
- All interaction patterns now work correctly:
  * click nodeId call functionName(args) - with arguments
  * click nodeId call functionName() - without arguments
  * click nodeId call functionName() "tooltip" - with tooltip
  * click nodeId href "url" - direct links
  * click nodeId href "url" "tooltip" - links with tooltip
- Improved lexer grammar to handle callback arguments as single tokens
- All 13 interaction tests now passing (100% success rate)

debug-callback-args.js

@@ -0,0 +1,59 @@
+import { execSync } from 'child_process';
+
+console.log('=== DEBUGGING CALLBACK ARGUMENTS ===');
+
+// Test the specific failing case
+const testInput = 'graph TD\nA-->B\nclick A call callback("test0", test1, test2)';
+console.log('Test input:', testInput);
+
+// Create a temporary test file to debug the ANTLR parser
+import fs from 'fs';
+const testFile = `
+// Debug callback arguments parsing
+process.env.USE_ANTLR_PARSER = 'true';
+
+const flow = require('./packages/mermaid/src/diagrams/flowchart/flowDb.ts');
+const parser = require('./packages/mermaid/src/diagrams/flowchart/parser/antlr/antlr-parser.ts');
+
+console.log('Testing callback arguments parsing...');
+
+// Mock the setClickEvent to see what parameters it receives
+const originalSetClickEvent = flow.default.setClickEvent;
+flow.default.setClickEvent = function(...args) {
+  console.log('DEBUG setClickEvent called with args:', args);
+  console.log('  - nodeId:', args[0]);
+  console.log('  - functionName:', args[1]); 
+  console.log('  - functionArgs:', args[2]);
+  console.log('  - args.length:', args.length);
+  return originalSetClickEvent.apply(this, args);
+};
+
+try {
+  const result = parser.parse('${testInput}');
+  console.log('Parse completed successfully');
+} catch (error) {
+  console.log('Parse error:', error.message);
+}
+`;
+
+fs.writeFileSync('debug-callback-test.js', testFile);
+
+try {
+  const result = execSync('node debug-callback-test.js', {
+    cwd: '/Users/ashishjain/projects/mermaid',
+    encoding: 'utf8',
+    timeout: 10000,
+  });
+  console.log('Result:', result);
+} catch (error) {
+  console.log('Error:', error.message);
+  if (error.stdout) console.log('Stdout:', error.stdout);
+  if (error.stderr) console.log('Stderr:', error.stderr);
+}
+
+// Clean up
+try {
+  fs.unlinkSync('debug-callback-test.js');
+} catch (e) {
+  // Ignore cleanup errors
+}