fix(input): recover cleanly on joystick reconnect

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

tests/engine/input_joystick_recovery_test.lua

@@ -0,0 +1,30 @@
+-- Joystick remove / resume clears stuck input sources (SWNX-19).
+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 Input = require("src.core.Input")
+local Game = require("src.core.Game")
+
+Input:init()
+Input:gamepadaxis(nil, "leftx", -0.9)
+Input:step()
+check(Input:isDown("left"), "stick holds left before disconnect")
+
+Game:joystickremoved({})
+check(not Input:isDown("left"), "joystickremoved clears stick hold")
+
+Input:gamepadpressed(nil, "a")
+Input:step()
+check(Input:isDown("a"), "button held before reconnect reset")
+Game:joystickadded({ getName = function() return "Joy-Con" end })
+check(not Input:isDown("a"), "joystickadded clears stale button hold")
+
+Input:gamepadaxis(nil, "lefty", 0.9)
+Input:step()
+Game:onResume()
+check(not Input:isDown("down"), "resume clears stuck axis state")
+
+T.finish()