feat(tracker): match the client's pin interactions on the marker button

Hover used a Blizzard minimize-button highlight, which read as a red
tint over the pin art and looked nothing like the map. The pins draw
their hover and pressed states from the same UI-QuestPoi-NumberIcons
atlas they draw everything else from, additively blended, so mirror
those cells alongside the ones already being copied.

Add the pressed offset the pins have, nudging the digit or the "?" a
pixel down and right while held, reset on redraw since the pool recycles
buttons and a line can be rebuilt with the mouse still down. Play the
sound the pins play as well: we call WorldMapFrame_SelectQuestFrame
directly, and the sound lives a level above it in WorldMapQuestPOI_OnClick.

Modules/Tracker/TrackerLinePool.lua

@@ -85,6 +85,17 @@ local function ApplySelectedVariant(texture, selected)
         topRightX, topRightY + offset, bottomRightX, bottomRightY + offset)
 end
 
+-- Whole-button states (hover, pressed) rather than the regions drawn inside them, so these fill the
+-- button on their own and only need the atlas cell copied across.
+local function MirrorPinButtonTexture(destination, source)
+    if (not destination) or (not source) or (not source.GetTexture) or (not source:GetTexture()) then
+        return
+    end
+
+    destination:SetTexture(source:GetTexture())
+    destination:SetTexCoord(source:GetTexCoord())
+end
+
 local function GetNumLines(label)
     if label.GetNumLines then
         return label:GetNumLines()
@@ -473,7 +484,12 @@ function TrackerLinePool.Initialize(questFrame)
         superTrackButton:SetWidth(25)
         superTrackButton:SetHeight(25)
         superTrackButton:SetHitRectInsets(1, 1, 1, 1)
-        superTrackButton:SetHighlightTexture("Interface\\BUTTONS\\UI-Panel-MinimizeButton-Highlight")
+
+        -- Hover and pressed states come from the pin atlas too, additively blended, exactly as the
+        -- client's own pins do it. RefreshSuperTrackButton mirrors the pin's cells over these.
+        superTrackButton:SetHighlightTexture("Interface\\WorldMap\\UI-QuestPoi-NumberIcons", "ADD")
+        superTrackButton:GetHighlightTexture():SetTexCoord(0.625, 0.75, 0.375, 0.5)
+        superTrackButton:SetPushedTexture("Interface\\WorldMap\\UI-QuestPoi-NumberIcons")
 
         -- Same texture and atlas sub-rect the client's own quest POI pins use, so the tracker button
         -- reads as native rather than as an addon icon.
@@ -501,6 +517,16 @@ function TrackerLinePool.Initialize(questFrame)
         -- The quest id is remembered even while the button is hidden. POI frames only exist once the
         -- world map has built them, so a quest that looks unreachable while the tracker is drawing
         -- can become reachable later -- without the id we would have nothing left to re-check.
+        -- The pin's pressed state nudges what is drawn inside it down and to the right; the pushed
+        -- texture covers the circle, this covers the digit and the "?".
+        superTrackButton.SetPressedOffset = function(self, pressed)
+            local offset = pressed and 1 or 0
+            self.number:ClearAllPoints()
+            self.number:SetPoint("CENTER", self, "CENTER", offset, -offset)
+            self.turnin:ClearAllPoints()
+            self.turnin:SetPoint("CENTER", self, "CENTER", offset, -offset)
+        end
+
         superTrackButton.SetSuperTrackButton = function(self, questId)
             self.questId = questId
             self:RefreshSuperTrackButton()
@@ -536,6 +562,14 @@ function TrackerLinePool.Initialize(questFrame)
                 ApplySelectedVariant(ownTexture, isSuperTracked)
             end
 
+            MirrorPinButtonTexture(self:GetHighlightTexture(), pin.GetHighlightTexture and pin:GetHighlightTexture())
+
+            local ownPushed = self:GetPushedTexture()
+            MirrorPinButtonTexture(ownPushed, pin.GetPushedTexture and pin:GetPushedTexture())
+            if ownPushed then
+                ApplySelectedVariant(ownPushed, isSuperTracked)
+            end
+
             local pinSize = pin:GetWidth()
             MirrorPinRegion(self.number, pin.number, buttonSize, pinSize)
             MirrorPinRegion(self.turnin, pin.turnin, buttonSize, pinSize)
@@ -543,6 +577,10 @@ function TrackerLinePool.Initialize(questFrame)
                 ApplySelectedVariant(self.number, isSuperTracked)
             end
 
+            -- Undo any leftover pressed offset: the pool recycles buttons, and a line can be redrawn
+            -- while the mouse is still held down.
+            self:SetPressedOffset(false)
+
             -- Flush with the left edge of the line, in the gutter GetSuperTrackMarginReserve keeps
             -- clear. Anchored to the top rather than centred on the line so the button stays level
             -- with the first row of a quest title that wraps, matching the collapse button.
@@ -566,8 +604,18 @@ function TrackerLinePool.Initialize(questFrame)
         superTrackButton:EnableMouse(true)
         superTrackButton:RegisterForClicks("LeftButtonUp")
 
+        superTrackButton:SetScript("OnMouseDown", function(self)
+            self:SetPressedOffset(true)
+        end)
+
+        superTrackButton:SetScript("OnMouseUp", function(self)
+            self:SetPressedOffset(false)
+        end)
+
         superTrackButton:SetScript("OnClick", function(self)
             if self.questId then
+                -- Same sound the client plays for its own quest pins.
+                PlaySound("igMainMenuOptionCheckBoxOn")
                 TrackerUtils:SetSuperTrackedQuest(self.questId)
             end
         end)