fix(switch): route remaining generated-art loads through Assets.resolve

Five more places called love.graphics.newImage directly on
assets/generated paths, bypassing the NX prefix rewrite:

- TradeAnim: cable/ball/bubble art
- TownMap: Kanto background, cursor, nest icon
- SurfingMinigame: surf bg/ob sheets
- BattleState: party ball row, substitute doll

All now resolve through Assets.resolve, which maps to the versioned
blue/ or yellow/ save-dir prefix on NX only. Desktop and Android keep
the mountVersion overlay behavior unchanged.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/ui/SurfingMinigame.lua

@@ -92,7 +92,7 @@ function SurfingMinigame.new(game, onDone)
   self.banner = nil       -- {quad, frames}: GOOD!/YEAH-/Oh no..
 
   local function sheet(path)
-    local ok, img = pcall(love.graphics.newImage, path)
+    local ok, img = pcall(love.graphics.newImage, require("src.render.Assets").resolve(path))
     return ok and img or nil
   end
   self.bg = sheet("assets/generated/minigame/surf_1a.png")

src/ui/TownMap.lua

@@ -104,7 +104,7 @@ local function loadBackground(game)
   local tm = (game.data.field or {}).townMap or {}
   local bg = tm.background
   if not (bg and bg.map and bg.tiles) then return nil end
-  local ok, img = pcall(love.graphics.newImage, bg.tiles.path)
+  local ok, img = pcall(love.graphics.newImage, require("src.render.Assets").resolve(bg.tiles.path))
   if not ok then return nil end
   local quads = {}
   local iw, ih = img:getDimensions()
@@ -115,7 +115,7 @@ local function loadBackground(game)
   end
   local cursor
   if bg.cursor then
-    local okc, c = pcall(love.graphics.newImage, bg.cursor.path)
+    local okc, c = pcall(love.graphics.newImage, require("src.render.Assets").resolve(bg.cursor.path))
     cursor = okc and c or nil
   end
   return { img = img, quads = quads, map = bg.map, cursor = cursor }
@@ -192,8 +192,9 @@ function TownMap.new(game, opts)
     -- field.townMap.nest lifts the icon path out of the engine
     local nest = ((game.data.field or {}).townMap or {}).nest
     local ok, img = pcall(love.graphics.newImage,
-                          (nest and nest.path)
-                          or "assets/generated/townmap/nest.png")
+                          require("src.render.Assets").resolve(
+                            (nest and nest.path)
+                            or "assets/generated/townmap/nest.png"))
     self.nestIcon = ok and img or nil
   end
   if opts.fly then

src/ui/TradeAnim.lua

@@ -29,7 +29,7 @@ local DEFAULT_ART = {
 
 local function tryImage(path)
   if not path then return nil end
-  local ok, img = pcall(love.graphics.newImage, path)
+  local ok, img = pcall(love.graphics.newImage, require("src.render.Assets").resolve(path))
   return ok and img or nil
 end