test: trigger sprite CI workflow (Troms)

[adriansberg]

Summary

• Adds data-test attribute to one SVG in sprite_assets/Troms/light/ to trigger the namespace-scoped sprite generation workflow
• Workflow should detect only Troms as changed, regenerate generated_sprites/Troms/ only, and auto-commit back to this branch

Expected workflow behavior

• Workflow triggers on sprite_assets/** path filter
• Detected namespace: Troms only
• Bot commits updated generated_sprites/Troms/*.{png,json} back to this branch
• generated_sprites/AtB, generated_sprites/FRAM, generated_sprites/NFK — untouched