refactor(slay-the-spire-like): clean up barrel exports and formatting

- Convert explicit barrel exports to `export *` patterns in several
  systems
- Create a new `utils/index.ts` barrel for the system utils
- Rename `validatePlacement` to `validateShapePlacement` for clarity
- Reformat `shape-collision.ts` to use 2-space indentation and
  consistent
  styling
- Fix import paths in `index.ts`

src/samples/slay-the-spire-like/system/utils/index.ts

@@ -0,0 +1,2 @@
+export * from "./parse-shape";
+export * from "./shape-collision";

src/samples/slay-the-spire-like/system/utils/shape-collision.ts

@@ -1,129 +1,132 @@
-import type { ParsedShape } from './parse-shape';
+import type { ParsedShape } from "./parse-shape";
 
 /**
  * Represents a 2D point in grid coordinates.
  */
 export interface Point2D {
-    x: number;
-    y: number;
+  x: number;
+  y: number;
 }
 
 /**
  * 2D transformation to apply to a shape.
  */
 export interface Transform2D {
-    /** Translation offset in grid units */
-    offset: Point2D;
-    /** Rotation in degrees (0, 90, 180, 270) */
-    rotation: number;
-    /** Whether to flip horizontally */
-    flipX: boolean;
-    /** Whether to flip vertically */
-    flipY: boolean;
+  /** Translation offset in grid units */
+  offset: Point2D;
+  /** Rotation in degrees (0, 90, 180, 270) */
+  rotation: number;
+  /** Whether to flip horizontally */
+  flipX: boolean;
+  /** Whether to flip vertically */
+  flipY: boolean;
 }
 
 /**
  * Default transform (identity).
  */
 export const IDENTITY_TRANSFORM: Transform2D = {
-    offset: { x: 0, y: 0 },
-    rotation: 0,
-    flipX: false,
-    flipY: false,
+  offset: { x: 0, y: 0 },
+  rotation: 0,
+  flipX: false,
+  flipY: false,
 };
 
 /**
  * Gets all occupied cell coordinates from a shape.
  */
 export function getOccupiedCells(shape: ParsedShape): Point2D[] {
-    const cells: Point2D[] = [];
-    for (let y = 0; y < shape.height; y++) {
-        for (let x = 0; x < shape.width; x++) {
-            if (shape.grid[y]?.[x]) {
-                cells.push({ x, y });
-            }
-        }
+  const cells: Point2D[] = [];
+  for (let y = 0; y < shape.height; y++) {
+    for (let x = 0; x < shape.width; x++) {
+      if (shape.grid[y]?.[x]) {
+        cells.push({ x, y });
+      }
     }
-    return cells;
+  }
+  return cells;
 }
 
 /**
  * Applies a 2D transformation to a point.
  */
 export function transformPoint(
-    point: Point2D,
-    transform: Transform2D,
-    shapeWidth: number,
-    shapeHeight: number
+  point: Point2D,
+  transform: Transform2D,
+  shapeWidth: number,
+  shapeHeight: number,
 ): Point2D {
-    let { x, y } = point;
+  let { x, y } = point;
 
-    // Apply flips
-    if (transform.flipX) {
-        x = shapeWidth - 1 - x;
-    }
-    if (transform.flipY) {
-        y = shapeHeight - 1 - y;
-    }
+  // Apply flips
+  if (transform.flipX) {
+    x = shapeWidth - 1 - x;
+  }
+  if (transform.flipY) {
+    y = shapeHeight - 1 - y;
+  }
 
-    // Apply rotation (around origin 0,0)
-    const rotation = ((transform.rotation % 360) + 360) % 360;
-    let rotatedX = x;
-    let rotatedY = y;
+  // Apply rotation (around origin 0,0)
+  const rotation = ((transform.rotation % 360) + 360) % 360;
+  let rotatedX = x;
+  let rotatedY = y;
 
-    switch (rotation) {
-        case 90:
-            rotatedX = y;
-            rotatedY = -x;
-            break;
-        case 180:
-            rotatedX = -x;
-            rotatedY = -y;
-            break;
-        case 270:
-            rotatedX = -y;
-            rotatedY = x;
-            break;
-    }
+  switch (rotation) {
+    case 90:
+      rotatedX = y;
+      rotatedY = -x;
+      break;
+    case 180:
+      rotatedX = -x;
+      rotatedY = -y;
+      break;
+    case 270:
+      rotatedX = -y;
+      rotatedY = x;
+      break;
+  }
 
-    // Apply offset
-    return {
-        x: rotatedX + transform.offset.x,
-        y: rotatedY + transform.offset.y,
-    };
+  // Apply offset
+  return {
+    x: rotatedX + transform.offset.x,
+    y: rotatedY + transform.offset.y,
+  };
 }
 
 /**
  * Transforms a shape and returnss its occupied cells in world coordinates.
  */
-export function transformShape(shape: ParsedShape, transform: Transform2D): Point2D[] {
-    const cells = getOccupiedCells(shape);
-    return cells.map(cell =>
-        transformPoint(cell, transform, shape.width, shape.height)
-    );
+export function transformShape(
+  shape: ParsedShape,
+  transform: Transform2D,
+): Point2D[] {
+  const cells = getOccupiedCells(shape);
+  return cells.map((cell) =>
+    transformPoint(cell, transform, shape.width, shape.height),
+  );
 }
 
 /**
  * Checks if two transformed shapes collide (share any occupied cell).
  */
 export function checkCollision(
-    shapeA: ParsedShape,
-    transformA: Transform2D,
-    shapeB: ParsedShape,
-    transformB: Transform2D
+  shapeA: ParsedShape,
+  transformA: Transform2D,
+  shapeB: ParsedShape,
+  transformB: Transform2D,
 ): boolean {
-    const cellsA = transformShape(shapeA, transformA);
-    const cellsB = transformShape(shapeB, transformB);
+  const cellsA = transformShape(shapeA, transformA);
+  const cellsB = transformShape(shapeB, transformB);
 
-    const setA = new Set(cellsA.map(c => `${c.x},${c.y}`));
+  const setA = new Set(cellsA.map((c) => `${c.x},${c.y}`));
 
-    for (const cell of cellsB) {
-        if (setA.has(`${cell.x},${cell.y}`)) {
-            return true;
-        }
+  for (const cell of cellsB) {
+    if (setA.has(`${cell.x},${cell.y}`)) {
+      return true;
     }
+  }
 
-    return false;
+  return false;
 }
 
 /**
@@ -133,19 +136,19 @@ export function checkCollision(
  * @param occupiedCells Set of occupied board cells in "x,y" format
  */
 export function checkBoardCollision(
-    shape: ParsedShape,
-    transform: Transform2D,
-    occupiedCells: Set<string>
+  shape: ParsedShape,
+  transform: Transform2D,
+  occupiedCells: Set<string>,
 ): boolean {
-    const cells = transformShape(shape, transform);
+  const cells = transformShape(shape, transform);
 
-    for (const cell of cells) {
-        if (occupiedCells.has(`${cell.x},${cell.y}`)) {
-            return true;
-        }
+  for (const cell of cells) {
+    if (occupiedCells.has(`${cell.x},${cell.y}`)) {
+      return true;
     }
+  }
 
-    return false;
+  return false;
 }
 
 /**
@@ -156,42 +159,47 @@ export function checkBoardCollision(
  * @param boardHeight Board height
  */
 export function checkBounds(
-    shape: ParsedShape,
-    transform: Transform2D,
-    boardWidth: number,
-    boardHeight: number
+  shape: ParsedShape,
+  transform: Transform2D,
+  boardWidth: number,
+  boardHeight: number,
 ): boolean {
-    const cells = transformShape(shape, transform);
+  const cells = transformShape(shape, transform);
 
-    for (const cell of cells) {
-        if (cell.x < 0 || cell.x >= boardWidth || cell.y < 0 || cell.y >= boardHeight) {
-            return false;
-        }
+  for (const cell of cells) {
+    if (
+      cell.x < 0 ||
+      cell.x >= boardWidth ||
+      cell.y < 0 ||
+      cell.y >= boardHeight
+    ) {
+      return false;
     }
+  }
 
-    return true;
+  return true;
 }
 
 /**
  * Validates that a placement is both in bounds and collision-free.
  * @returns Object with `valid` flag and optional `reason` string
  */
-export function validatePlacement(
-    shape: ParsedShape,
-    transform: Transform2D,
-    boardWidth: number,
-    boardHeight: number,
-    occupiedCells: Set<string>
+export function validateShapePlacement(
+  shape: ParsedShape,
+  transform: Transform2D,
+  boardWidth: number,
+  boardHeight: number,
+  occupiedCells: Set<string>,
 ): { valid: true } | { valid: false; reason: string } {
-    if (!checkBounds(shape, transform, boardWidth, boardHeight)) {
-        return { valid: false, reason: '超出边界' };
-    }
+  if (!checkBounds(shape, transform, boardWidth, boardHeight)) {
+    return { valid: false, reason: "超出边界" };
+  }
 
-    if (checkBoardCollision(shape, transform, occupiedCells)) {
-        return { valid: false, reason: '与已有形状重叠' };
-    }
+  if (checkBoardCollision(shape, transform, occupiedCells)) {
+    return { valid: false, reason: "与已有形状重叠" };
+  }
 
-    return { valid: true };
+  return { valid: true };
 }
 
 /**
@@ -199,29 +207,32 @@ export function validatePlacement(
  * @param current The current transform
  * @param degrees Degrees to rotate (typically 90, 180, or 270)
  */
-export function rotateTransform(current: Transform2D, degrees: number): Transform2D {
-    return {
-        ...current,
-        rotation: ((current.rotation + degrees) % 360 + 360) % 360,
-    };
+export function rotateTransform(
+  current: Transform2D,
+  degrees: number,
+): Transform2D {
+  return {
+    ...current,
+    rotation: (((current.rotation + degrees) % 360) + 360) % 360,
+  };
 }
 
 /**
  * Flips a transform horizontally.
  */
 export function flipXTransform(current: Transform2D): Transform2D {
-    return {
-        ...current,
-        flipX: !current.flipX,
-    };
+  return {
+    ...current,
+    flipX: !current.flipX,
+  };
 }
 
 /**
  * Flips a transform vertically.
  */
 export function flipYTransform(current: Transform2D): Transform2D {
-    return {
-        ...current,
-        flipY: !current.flipY,
-    };
+  return {
+    ...current,
+    flipY: !current.flipY,
+  };
 }