When enabled, hint to the player that they should limit their active party to the same number of Pokemon as the next boss fight. This is a self-imposed difficulty rule — the tracker cannot enforce it since it doesn't track the active party, but it can surface the information.
**Display:** When enabled and the sticky boss banner is shown, add a hint next to the boss name showing their team size, e.g. "Next: Brock (2 Pokemon — match their team)". This reuses the existing `nextBoss` and its `pokemon` array.
**Variant bosses:** Some bosses have conditional teams (e.g. rival starter choice). Use the same logic as `BossTeamPreview`: count pokemon without a `conditionLabel` plus those matching the auto-detected variant (via `matchVariant`). Falls back to first variant if no match is detected.
