refactor(frontend): consolidate orphaned icon components into shared icon library

[mrveiss]

Gap: 5 orphaned icon components (IconCommunity, IconSupport, IconDocumentation, IconEcosystem, IconTooling) exist as individual files with minimal CSS.

Status: Zero imports/usage found. These are placeholder icons that should be part of a centralized icon system.

Action:

1. Consolidate into a shared icon library or icon system
2. Use with props for size, color, variant
3. Update any design system docs to reference icon library
4. Delete individual orphaned icon component files

Related: Issue #4184 (audit of 24 orphaned components)

[mrveiss]

✅ Already merged to Dev_new_gui (commit a5bde6f). Closing.