Target Highlight

## 0.3.0
- In-reach indicator: the ring brightens (or switches colour) while the target is inside your real weapon reach, so you can tell whether a hit will land. Modes: `OFF`, `BRIGHTEN`, `COLOR`.
- `rangeExtra` lets you fine-tune the reach check.
- Optional Better Combat support: when Better Combat is installed, the in-reach indicator uses the held weapon's own attack range (measured from shoulder height, like Better Combat does) instead of the vanilla reach. No dependency; `useBetterCombat` turns it off.
- Weapon-only mode: show the highlight only while the main hand holds a weapon (swords, plus optionally axes and ranged weapons). Extra items can be added by id. Off by default.