feat: Enhance navigation and cleanup for graph explorer view

- Added a cleanup function to reset the state when navigating away from the graph explorer.
- Updated navigation logic to call the cleanup function before switching views.
- Improved internationalization by adding new translations for graph-related terms.
- Adjusted icon sizes for better UI consistency in the graph explorer.
- Implemented impact analysis button functionality in the graph explorer.
- Refactored CLI tool configuration to use updated model names.
- Enhanced CLI executor to handle prompts correctly for codex commands.
- Introduced code relationship storage for better visualization in the index tree.
- Added support for parsing Markdown and plain text files in the symbol parser.
- Updated tests to reflect changes in language detection logic.

ccw/src/core/server.ts

@@ -62,7 +62,8 @@ const MODULE_CSS_FILES = [
   '11-memory.css',
   '11-prompt-history.css',
   '12-skills-rules.css',
-  '13-claude-manager.css'
+  '13-claude-manager.css',
+  '14-graph-explorer.css'
 ];
 
 // Modular JS files in dependency order
@@ -109,6 +110,7 @@ const MODULE_FILES = [
   'views/skills-manager.js',
   'views/rules-manager.js',
   'views/claude-manager.js',
+  'views/graph-explorer.js',
   'main.js'
 ];