feat: enhance icon search tags with comprehensive keywords

Added relevant search terms to empty tag arrays and expanded existing ones:
- Arrow/direction icons: added compass directions, navigation terms
- Interface elements: enhanced with UI/UX keywords
- Technical icons: improved programming and development terms
- General icons: added synonyms and related concepts

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

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

Author: rubychilds