Enhances SpoolIcon component with optional showHex prop:
- Displays hex color code next to swatch when enabled
- Click to copy hex code to clipboard
- Shows tooltip with copy hint
- Supports both single and multi-color filaments
Enabled on detail pages:
- Filament show page
- Spool show page
Added translation keys for copy feedback messages.
Closes#33
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
