Smarter buff handling — don't waste buffs that cancel each other

Some fishing buffs replace each other (using one cancels the other), while others can be active at the same time. Today SBF can't tell the difference, so it can waste consumables re-applying a buff that just overwrote another one. This teaches SBF which buffs compete and which stack — automatically, by recognizing when two items grant the same buff. The result: SBF keeps every buff it *can* have up at once and cycles the ones that conflict instead of burning through them. More uptime, fewer wasted consumables, and you don't configure any of it by hand.