Add @cursor token for ground-target spells/items

@cursor places a ground-target spell or on-use item at the cursor via
ClassicAPI's engine-level placement instead of the [mouseuse] reticle-
click simulation (so no auto-attack side effect).

- ParseMsg flags @cursor as conditionals.atCursor rather than setting a
  bogus "cursor" unit target, so it doesn't affect help/harm/exists/range
  checks or pass an invalid token to CastSpellByName.
- DoWithConditionals routes atCursor casts through C_Spell.CastAtCursor
  (spellID resolved from the spell index / GetSpellIdForName) and item
  uses through C_Item.UseAtCursor. Both fall back to a normal cast/use
  for non-ground actions.

New syntax, so existing macros are unaffected; MacroErrorChecker already
accepts @cursor.

Core.lua

@@ -2041,7 +2041,15 @@ function CleveRoids.ParseMsg(msg)
     local _, _, target = string.find(conditionBlock, "(@[^%s,]+)")
     if target then
         conditionBlock = CleveRoids.Trim(string.gsub(conditionBlock, target, ""))
-        conditionals.target = string.sub(target, 2)
+        local tok = string.sub(target, 2)
+        -- @cursor is a ground-target directive, not a unit. Flag it so the cast
+        -- routes through ClassicAPI's CastAtCursor / UseAtCursor, and leave the
+        -- target at its default (CastAtCursor places at the cursor regardless).
+        if string.lower(tok) == "cursor" then
+            conditionals.atCursor = true
+        else
+            conditionals.target = tok
+        end
     end
 
     if conditionBlock and conditionals.action then
@@ -2655,7 +2663,25 @@ function CleveRoids.DoWithConditionals(msg, hook, fixEmptyTargetFunc, targetBefo
                 castMsg = msg .. "(" .. rank .. ")"
             end
         end
-        if action == CastSpellByName then
+        if conditionals.atCursor then
+            -- @cursor: place a ground-target spell/item at the cursor via
+            -- ClassicAPI (no AoE-reticle click). Both functions fall back to a
+            -- normal cast/use for non-ground actions.
+            if action == CastSpellByName then
+                local sp = CleveRoids.GetSpell(msg)
+                local spellId = sp and sp.id
+                if not spellId and GetSpellIdForName then
+                    spellId = GetSpellIdForName(castMsg)
+                end
+                if spellId then
+                    C_Spell.CastAtCursor(spellId)
+                else
+                    CastSpellByName(castMsg)
+                end
+            else
+                C_Item.UseAtCursor(msg)
+            end
+        elseif action == CastSpellByName then
             -- ! prefix anti-toggle: prevent CastSpellByName from toggling off active spells.
             -- For Attack/AutoShot/Shoot, use the non-toggling AttackTarget() API.
             -- For self-buffs/shapeshifts, skip if already active on the player.