fix(input): ignore raw face presses when Joy-Con is gamepad

love-nx emits gamepad+raw on one press; NamingScreen saw a+b and always
erased. Skip raw when isGamepad(); align NX Y→a/X→b; prefer A if both.

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

tests/engine/input_dual_path_test.lua

@@ -0,0 +1,42 @@
+-- When isGamepad(), raw face presses must not stack on gamepad* (NamingScreen a+b).
+package.path = "./?.lua;./?/init.lua;" .. package.path
+if not _G.love then _G.love = require("tests.love_stub") end
+
+local T = require("tests.harness")
+local check = T.check
+local eq = T.eq
+
+local GamepadMap = require("src.core.GamepadMap")
+local Input = require("src.core.Input")
+
+local gamepadJoy = {
+  isGamepad = function() return true end,
+}
+local rawJoy = {
+  isGamepad = function() return false end,
+}
+
+check(GamepadMap.ignoreRawForJoystick(gamepadJoy), "ignore raw when isGamepad")
+check(not GamepadMap.ignoreRawForJoystick(rawJoy), "allow raw when not gamepad")
+check(not GamepadMap.ignoreRawForJoystick(nil), "nil joystick does not ignore raw")
+
+GamepadMap._setForceNXForTests(true)
+eq(GamepadMap.mapRawButton(3), "a", "NX raw Y (#3) -> GB A")
+eq(GamepadMap.mapRawButton(4), "b", "NX raw X (#4) -> GB B")
+GamepadMap._setForceNXForTests(false)
+
+Input:init()
+Input:gamepadpressed(gamepadJoy, "a")
+Input:joystickpressed(gamepadJoy, 1) -- must no-op
+Input:joystickpressed(gamepadJoy, 2) -- must no-op (would have set b)
+Input:step()
+check(Input:wasPressed("a"), "gamepad A edge present")
+check(not Input:wasPressed("b"), "raw must not add B alongside gamepad A")
+check(Input:isDown("a"), "A held from pad source only")
+
+Input:init()
+Input:joystickpressed(rawJoy, 1)
+Input:step()
+check(Input:wasPressed("a"), "non-gamepad raw #1 still maps to A")
+
+T.finish()

tests/engine/input_nx_raw_map_test.lua

@@ -9,11 +9,11 @@ local GamepadMap = require("src.core.GamepadMap")
 
 GamepadMap._setForceNXForTests(true)
 
--- Phase 0 probe: Y→#3, X→#4; Nintendo B/A at #1/#2.
-eq(GamepadMap.mapRawButton(3), "b", "NX raw Y (#3) maps to GB B")
-eq(GamepadMap.mapRawButton(4), "a", "NX raw X (#4) maps to GB A")
-eq(GamepadMap.mapRawToGamepadButton(3), "y", "NX raw #3 routes to gamepad y")
-eq(GamepadMap.mapRawToGamepadButton(4), "x", "NX raw #4 routes to gamepad x")
+-- Phase 0 / naming diagnosis: Y→#3→a, X→#4→b; Nintendo B/A at #1/#2.
+eq(GamepadMap.mapRawButton(3), "a", "NX raw Y (#3) maps to GB A")
+eq(GamepadMap.mapRawButton(4), "b", "NX raw X (#4) maps to GB B")
+eq(GamepadMap.mapRawToGamepadButton(3), "a", "NX raw #3 routes to gamepad a")
+eq(GamepadMap.mapRawToGamepadButton(4), "b", "NX raw #4 routes to gamepad b")
 eq(GamepadMap.mapRawButton(9), "select", "NX minus (#9) -> select")
 eq(GamepadMap.mapRawButton(10), "start", "NX plus (#10) -> start")