fix(navigation): update paths from functions/ to features/ and improve menu generator

- Replace all functions/ paths with features/ in navigation.md
- Remove orphan ai-chat-box.md reference (file doesn't exist)
- Fix navigation2menu.js to accept file argument (was blocking on stdin)
- Add progress output to navigation2menu.js for visibility
- Add pandoc to Hugo security allow list in both config files
- Regenerate menu.en.json with correct paths

Author: wreiske

config-eh.toml

@@ -105,4 +105,4 @@ notAlternative = true
 
 [security]
   [security.exec]
-    allow = ['^(dart-)?sass(-embedded)?$', '^go$', '^git$', '^npx$', '^postcss$', '^tailwindcss$']
+    allow = ['^(dart-)?sass(-embedded)?$', '^go$', '^git$', '^npx$', '^postcss$', '^tailwindcss$', '^pandoc$']

config-wc.toml

@@ -104,4 +104,4 @@ notAlternative = true
 
 [security]
   [security.exec]
-    allow = ['^(dart-)?sass(-embedded)?$', '^go$', '^git$', '^npx$', '^postcss$', '^tailwindcss$']
+    allow = ['^(dart-)?sass(-embedded)?$', '^go$', '^git$', '^npx$', '^postcss$', '^tailwindcss$', '^pandoc$']