M1: rörelse, kollision, kamera, scener, tileset, skärmdumpar, CI

- internal/sim: rutbaserad Mover (4 riktningar, riktningsbyte vid rutgräns,
  bildrute-exakt ankomst) och Camera (följer, klampar, centrerar små kartor),
  med tester
- internal/game: scener meny -> bana -> resultat, tangentbord + gamepad,
  tileset och spelaranimation, HUD, skriptläge (-script) för deterministiska
  skärmdumpar och tester
- tools/genart genererar placeholder-grafik (tiles.png, player.png);
  tools/shots tar doc/img/*.png som README och wiki visar
- bana 002-shinjuku (33x21) för kamerascroll; level.List/LoadFile/TrainAt
- .gitea/workflows/release.yaml: vet + test + linux/windows-zippar till
  rullande latest på brasse-linux01-runnern (linux-amd64)
- docs: roadmap M1 klar, tester, plan, README med bilder och styrning

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

internal/game/input.go

@@ -0,0 +1,99 @@
+package game
+
+import (
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/inpututil"
+
+	"gitea.brasse-pc.eu/brasse/metro-puzzle-jp/internal/sim"
+)
+
+const stickDeadzone = 0.5
+
+// dirInput returnerar hållen riktning från tangentbord (pilar/WASD) eller
+// gamepad (d-pad / vänster spak). None om inget hålls.
+func dirInput() sim.Dir {
+	if virtual.held != sim.None {
+		return virtual.held
+	}
+	switch {
+	case ebiten.IsKeyPressed(ebiten.KeyArrowUp) || ebiten.IsKeyPressed(ebiten.KeyW):
+		return sim.Up
+	case ebiten.IsKeyPressed(ebiten.KeyArrowDown) || ebiten.IsKeyPressed(ebiten.KeyS):
+		return sim.Down
+	case ebiten.IsKeyPressed(ebiten.KeyArrowLeft) || ebiten.IsKeyPressed(ebiten.KeyA):
+		return sim.Left
+	case ebiten.IsKeyPressed(ebiten.KeyArrowRight) || ebiten.IsKeyPressed(ebiten.KeyD):
+		return sim.Right
+	}
+	for _, id := range ebiten.AppendGamepadIDs(nil) {
+		if !ebiten.IsStandardGamepadLayoutAvailable(id) {
+			continue
+		}
+		switch {
+		case ebiten.IsStandardGamepadButtonPressed(id, ebiten.StandardGamepadButtonLeftTop):
+			return sim.Up
+		case ebiten.IsStandardGamepadButtonPressed(id, ebiten.StandardGamepadButtonLeftBottom):
+			return sim.Down
+		case ebiten.IsStandardGamepadButtonPressed(id, ebiten.StandardGamepadButtonLeftLeft):
+			return sim.Left
+		case ebiten.IsStandardGamepadButtonPressed(id, ebiten.StandardGamepadButtonLeftRight):
+			return sim.Right
+		}
+		x := ebiten.StandardGamepadAxisValue(id, ebiten.StandardGamepadAxisLeftStickHorizontal)
+		y := ebiten.StandardGamepadAxisValue(id, ebiten.StandardGamepadAxisLeftStickVertical)
+		switch {
+		case y < -stickDeadzone:
+			return sim.Up
+		case y > stickDeadzone:
+			return sim.Down
+		case x < -stickDeadzone:
+			return sim.Left
+		case x > stickDeadzone:
+			return sim.Right
+		}
+	}
+	return sim.None
+}
+
+// confirmJustPressed: Enter/mellanslag eller gamepadens nedre knapp (A/kryss).
+func confirmJustPressed() bool {
+	if virtual.pressed["enter"] {
+		return true
+	}
+	if inpututil.IsKeyJustPressed(ebiten.KeyEnter) || inpututil.IsKeyJustPressed(ebiten.KeySpace) {
+		return true
+	}
+	return gamepadJustPressed(ebiten.StandardGamepadButtonRightBottom)
+}
+
+// backJustPressed: Escape eller gamepadens högra knapp (B/cirkel).
+func backJustPressed() bool {
+	return virtual.pressed["esc"] || inpututil.IsKeyJustPressed(ebiten.KeyEscape) || gamepadJustPressed(ebiten.StandardGamepadButtonRightRight)
+}
+
+// menuMove returnerar -1/+1 när användaren just tryckte upp/ner i en meny.
+func menuMove() int {
+	switch {
+	case virtual.pressed["up"]:
+		return -1
+	case virtual.pressed["down"]:
+		return 1
+	case inpututil.IsKeyJustPressed(ebiten.KeyArrowUp) || inpututil.IsKeyJustPressed(ebiten.KeyW) || gamepadJustPressed(ebiten.StandardGamepadButtonLeftTop):
+		return -1
+	case inpututil.IsKeyJustPressed(ebiten.KeyArrowDown) || inpututil.IsKeyJustPressed(ebiten.KeyS) || gamepadJustPressed(ebiten.StandardGamepadButtonLeftBottom):
+		return 1
+	}
+	return 0
+}
+
+func gamepadJustPressed(b ebiten.StandardGamepadButton) bool {
+	for _, id := range ebiten.AppendGamepadIDs(nil) {
+		if ebiten.IsStandardGamepadLayoutAvailable(id) && inpututil.IsStandardGamepadButtonJustPressed(id, b) {
+			return true
+		}
+	}
+	return false
+}
+
+// inpututil_R: R = spela om banan.
+func inpututil_R() bool { return virtual.pressed["r"] || inpututil.IsKeyJustPressed(ebiten.KeyR) }