Add imp catching with magic boxes

[HarleyGilpin]

Builds on #1239 (the first commit here is that PR; only the last commit is new).

Adds level 71 imp catching:

• Activate a magic box (10025) to place it (19223), using the existing hunting_imptrap_npc (5101) trap NPC with a new id-filtered magic_box hunt mode targeting imp only (god wars imps excluded).
• A caught imp plays gfx 932 and the box runs through the 19225 -> 19226 shaking states; Retrieve gives an imp-in-a-box(2) (the magic box itself is consumed) plus 450 xp. Failure leaves Magic box failed (19224); Deactivate returns the box.
• Imp-in-a-box: using an item on it sends that item to the bank and uses a charge, 10027 -> 10028 -> empty magic box; it refuses to bank other imp boxes. The authentic item-select interface (478) is left as a follow-up — this is the minimal use-item flow.

Options (Activate, Deactivate, Retrieve, Investigate) match the 634 cache. Imp catch/fail anims 5218/5285 are from later-revision references.

Tests

MagicBoxTest: catch, fail, level gate, imp-in-a-box charge flow, imp-box-on-imp-box refusal.

[HarleyGilpin]

Consolidated into #1239.