Restore Clique support on unit frames

Fixes #33.

Clique's pfUI plugin replaces pfUI.uf.ClickAction and calls it from an
OnClick script. The move to secure attribute clicks removed that
function, so Clique stopped working.

Add the legacy Lua click path back for Clique. When Clique is loaded,
EnableScripts sets an OnClick script that runs ClickAction. When Clique
is not loaded, the frames keep the secure attribute path.

Skip the secure attributes in Clique mode. The type1 target attribute
switches the target before Clique can cast. Right-click opens the unit
menu through ClassicAPI_ToggleUnitMenu.

api/unitframes.lua

@@ -1209,16 +1209,72 @@ function pfUI.uf:EnableEvents()
     'MiddleButtonUp', 'Button4Up', 'Button5Up')
 end
 
+-- ============================================================
+-- Clique compatibility
+-- Clique's pfUI plugin replaces pfUI.uf.ClickAction and expects an
+-- OnClick script to call it (with `this` = frame, `arg1` = button). The
+-- secure attribute path replaced that dispatch, so when Clique is loaded
+-- EnableScripts routes clicks through this legacy Lua path instead. The
+-- secure path is skipped there because type1="target" switches the target
+-- before Clique can cast.
+-- ============================================================
+
+function pfUI.uf.OnClick()
+  if not this.label and this.unitname then
+    TargetByName(this.unitname, true)
+  else
+    pfUI.uf:ClickAction(arg1)
+  end
+end
+
+function pfUI.uf:ClickAction(button)
+  local label = this.label or ""
+  local id = this.id or ""
+  local unitstr = label .. id
+
+  if SpellIsTargeting() and button == "RightButton" then
+    SpellStopTargeting()
+    return
+  end
+
+  if SpellIsTargeting() and button == "LeftButton" then
+    SpellTargetUnit(unitstr)
+  elseif CursorHasItem() then
+    DropItemOnUnit(unitstr)
+  end
+
+  -- right-click opens the standard unit menu (ClassicAPI resolves the type)
+  if button == "RightButton" then
+    ClassicAPI_ToggleUnitMenu(unitstr)
+    return
+  end
+
+  -- drop food on petframe
+  if label == "pet" and CursorHasItem() then
+    if UnitClassBase("player") == "HUNTER" then
+      DropItemOnUnit("pet")
+      return
+    end
+  end
+
+  -- default click
+  TargetUnit(unitstr)
+end
+
 function pfUI.uf:EnableScripts()
   local f = self
 
-  f:SetAttribute("type1", "target")
-  f:SetAttribute("type2", "menu")
+  if IsAddOnLoaded("Clique") then
+    f:SetScript("OnClick", pfUI.uf.OnClick)
+  else
+    f:SetAttribute("type1", "target")
+    f:SetAttribute("type2", "menu")
+    f:EnableClickCast()
+  end
 
   f:SetScript("OnShow", pfUI.uf.OnShow)
   f:SetScript("OnEvent", pfUI.uf.OnEvent)
   f:SetScript("OnUpdate", pfUI.uf.OnUpdate)
-  f:EnableClickCast()
 
   -- add frame to visibility refresh handler
   visibilityscan.frames[f] = true