the NPC, loot and quest windows register their handlers

- the six NPC windows — gossip, vendor, bank, trainer, stable master, taxi — register their own packet handlers and net/apply/npc.rs leaves the drain; a handler call measures ~25 ns, so the table can carry the busy families as it is (2318)
- the loot window, the group rolls and the inventory refusal register theirs (2319), then the questgiver panels, the quest log and the party share (2320): 273 → 149 kinds in the dispatch match since the table opened
- the show cascade is pinned against the reference's: ours notifies a parent before its children and snapshots the list, theirs is post-order and re-reads — a recorded gap, held by a test on the auction window (2317)

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

crates/benilla-app/src/ui_script/merchant_tests.rs

@@ -1179,7 +1179,7 @@ fn ctrl_and_shift_on_a_vendor_row_preview_and_post_without_buying() {
             num_available: -1,
             item_id: 159,
             stats: None,
-            // Fed exactly as `ui_merchant.rs` builds it off the row's template answer.
+            // Fed exactly as `ui_merchant` builds it off the row's template answer.
             link: Some(WATER_LINK.into()),
             max_stack: Some(1),
         }],

crates/benilla-app/src/ui_script/panel_tests.rs

@@ -296,7 +296,7 @@ fn shipped_gossip_frame_renders_quest_rows_above_options() {
     assert!(s.errors().is_empty(), "script errors: {:?}", s.errors());
 
     // Rows 1-2 carry the quest titles (active first, matching the order the menu supplied them —
-    // benilla's seam already flattens available/active into one ordered list, ui_gossip.rs), row 3
+    // benilla's seam already flattens available/active into one ordered list, `ui_gossip`), row 3
     // the option, row 4+ hidden.
     let (r1_text, r1_vis, r2_vis, r3_text, r3_vis, r4_vis, r5_text, r5_vis, r6_vis): (
         String,