Show the running app version on the Switch launcher header.

Add an NX-only yellow version chip so players can confirm which build is on the microSD after OTA or zip updates.

tests/engine/launcher_nx_version_chip_test.lua

@@ -0,0 +1,26 @@
+-- Switch launcher shows the running engine version in the header (NX only).
+-- Desktop/Android/iOS must not paint that chip.
+
+local function read(path)
+  local f = assert(io.open(path, "r"))
+  local s = f:read("*a")
+  f:close()
+  return s
+end
+
+local src = read("src/import/LauncherView.lua")
+
+assert(src:find('local Version = require%("src%.core%.Version"%)')
+  or src:find('require%("src%.core%.Version"%)'),
+  "LauncherView must require Version")
+
+assert(src:find("imp%.isNX", 1, false), "version chip must gate on isNX")
+
+-- The chip is inside an isNX block and prints Version.engine
+local nxBlock = src:match("if imp%.isNX then(.-)end\n\n  %-%- Settings gear")
+assert(nxBlock, "expected Switch-only version chip before the settings gear")
+assert(nxBlock:find("Version%.engine", 1, false), "chip must show Version.engine")
+assert(nxBlock:find('"v"', 1, true) or nxBlock:find('"v" %.%.', 1, false),
+  "chip label should be a v-prefixed version")
+
+print("ok — Switch launcher version chip is NX-gated and uses Version.engine")