feat(trade): document influence-filter combinations via tooltip

Add a shared tooltip on both Influence fields listing the nine distinct
pair semantics (no filter, no influences, exactly 1, at least 1, exactly
2, plus the specific variants). Ordered by the number of required
influences so users can scan to the constraint they want.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: mcagnion

src/Classes/TradeQueryGenerator.lua

@@ -1342,14 +1342,29 @@ Remove: %s will be removed from the search results.]], term, term, term)
 			end
 		end
 
+		local influenceTooltipText = table.concat({
+			"^7Influence filter (both fields combine):",
+			"Ignore / Ignore: no filter",
+			"None / None: no influences",
+			"Any / None: exactly 1 influence",
+			"<specific> / None: exactly 1, that specific",
+			"Any / Ignore: at least 1 influence",
+			"<specific> / Ignore: at least 1, that specific",
+			"Any / Any: exactly 2 influences",
+			"<specific> / Any: exactly 2, including that specific",
+			"<specific A> / <specific B>: exactly 2, both specifics",
+		}, "\n")
+
 		controls.influence1 = new("DropDownControl", { "TOPLEFT", lastItemAnchor, "BOTTOMLEFT" }, { 0, 5, 100, 18 },
 			influenceDropdownNames, refreshInfluenceDependentControls)
 		controls.influence1:SetSel(self.lastInfluence1 or INFLUENCE_IGNORE_INDEX)
+		controls.influence1.tooltipText = influenceTooltipText
 		controls.influence1Label = new("LabelControl", {"RIGHT",controls.influence1,"LEFT"}, {-5, 0, 0, 16}, "^7Influence 1:")
 
 		controls.influence2 = new("DropDownControl", { "TOPLEFT", controls.influence1, "BOTTOMLEFT" }, { 0, 5, 100, 18 },
 			influenceDropdownNames, refreshInfluenceDependentControls)
 		controls.influence2:SetSel(self.lastInfluence2 or INFLUENCE_IGNORE_INDEX)
+		controls.influence2.tooltipText = influenceTooltipText
 		refreshInfluenceDependentControls()
 		controls.influence2Label = new("LabelControl", { "RIGHT", controls.influence2, "LEFT" }, { -5, 0, 0, 16 },
 			"^7Influence 2:")