Web UI polish from the #46 feedback round (@LeeNX):
- Restart has its own icon (single circular arrow, drawn in-house) — Update keeps the two-arrow glyph, so the two actions no longer share a symbol.
- Legend's Stop key is outlined red instead of mirroring the real button's solid fill — lighter in a key row; the actual button is unchanged.
- Consistent help cursor on every hover-explained badge and marker.