feat: Add workflow dashboard template and utility functions

- Implemented a new HTML template for the workflow dashboard, featuring a responsive design with dark/light theme support, session statistics, and task management UI.
- Created a browser launcher utility to open HTML files in the default browser across platforms.
- Developed file utility functions for safe reading and writing of JSON and text files.
- Added path resolver utilities to validate and resolve file paths, ensuring security against path traversal attacks.
- Introduced UI utilities for displaying styled messages and banners in the console.

ccw/src/commands/list.js

@@ -0,0 +1,37 @@
+import chalk from 'chalk';
+import { showBanner, divider, info } from '../utils/ui.js';
+import { getAllManifests } from '../core/manifest.js';
+
+/**
+ * List command handler - shows all installations
+ */
+export async function listCommand() {
+  showBanner();
+  console.log(chalk.cyan.bold('  Installed Claude Code Workflow Instances\n'));
+
+  const manifests = getAllManifests();
+
+  if (manifests.length === 0) {
+    info('No installations found.');
+    console.log('');
+    console.log(chalk.gray('  Run: ccw install - to install Claude Code Workflow'));
+    console.log('');
+    return;
+  }
+
+  manifests.forEach((m, i) => {
+    const modeColor = m.installation_mode === 'Global' ? chalk.cyan : chalk.yellow;
+
+    console.log(chalk.white.bold(`  ${i + 1}. `) + modeColor.bold(m.installation_mode));
+    console.log(chalk.gray(`     Path:    ${m.installation_path}`));
+    console.log(chalk.gray(`     Date:    ${new Date(m.installation_date).toLocaleDateString()}`));
+    console.log(chalk.gray(`     Version: ${m.application_version}`));
+    console.log(chalk.gray(`     Files:   ${m.files_count}`));
+    console.log(chalk.gray(`     Dirs:    ${m.directories_count}`));
+    console.log('');
+  });
+
+  divider();
+  console.log(chalk.gray('  Run: ccw uninstall - to remove an installation'));
+  console.log('');
+}