Extract shared expandHomePrefix utility to eliminate duplication

Move the tilde expansion logic into a shared utils/expand-home.ts
module and use it from all four call sites: build-utils.ts,
project-config.ts, build-settings.ts, and cli/commands/init.ts.

The shared version handles both ~/ and ~\ (Windows) consistently,
matching the behavior that was previously only in init.ts.

Author: trmquang93

src/cli/commands/init.ts

@@ -5,6 +5,7 @@ import * as os from 'node:os';
 import * as clack from '@clack/prompts';
 import { getResourceRoot } from '../../core/resource-root.ts';
 import { createPrompter, isInteractiveTTY, type Prompter } from '../interactive/prompts.ts';
+import { expandHomePrefix } from '../../utils/expand-home.ts';
 
 type SkillType = 'mcp' | 'cli';
 
@@ -72,18 +73,6 @@ function readSkillContent(skillType: SkillType): string {
   return fs.readFileSync(sourcePath, 'utf8');
 }
 
-function expandHomePrefix(inputPath: string): string {
-  if (inputPath === '~') {
-    return os.homedir();
-  }
-
-  if (inputPath.startsWith('~/') || inputPath.startsWith('~\\')) {
-    return path.join(os.homedir(), inputPath.slice(2));
-  }
-
-  return inputPath;
-}
-
 function resolveDestinationPath(inputPath: string): string {
   return path.resolve(expandHomePrefix(inputPath));
 }

src/mcp/tools/device/build-settings.ts

@@ -1,26 +1,19 @@
 import path from 'node:path';
-import { homedir } from 'node:os';
 import { XcodePlatform } from '../../../types/common.ts';
 import type { CommandExecutor } from '../../../utils/execution/index.ts';
+import { expandHomePrefix } from '../../../utils/expand-home.ts';
 
 function resolvePathFromCwd(pathValue?: string): string | undefined {
   if (!pathValue) {
     return undefined;
   }
 
-  if (pathValue === '~') {
-    return homedir();
+  const expanded = expandHomePrefix(pathValue);
+  if (path.isAbsolute(expanded)) {
+    return expanded;
   }
 
-  if (pathValue.startsWith('~/')) {
-    return path.join(homedir(), pathValue.slice(2));
-  }
-
-  if (path.isAbsolute(pathValue)) {
-    return pathValue;
-  }
-
-  return path.resolve(process.cwd(), pathValue);
+  return path.resolve(process.cwd(), expanded);
 }
 
 export type DevicePlatform = 'iOS' | 'watchOS' | 'tvOS' | 'visionOS';

src/utils/build-utils.ts

@@ -32,19 +32,14 @@ import {
 } from './xcodemake.ts';
 import { sessionStore } from './session-store.ts';
 import path from 'path';
-import { homedir } from 'os';
+import { expandHomePrefix } from './expand-home.ts';
 
 function resolvePathFromCwd(pathValue: string): string {
-  if (pathValue === '~') {
-    return homedir();
+  const expanded = expandHomePrefix(pathValue);
+  if (path.isAbsolute(expanded)) {
+    return expanded;
   }
-  if (pathValue.startsWith('~/')) {
-    return path.join(homedir(), pathValue.slice(2));
-  }
-  if (path.isAbsolute(pathValue)) {
-    return pathValue;
-  }
-  return path.resolve(process.cwd(), pathValue);
+  return path.resolve(process.cwd(), expanded);
 }
 
 /**

src/utils/expand-home.ts

@@ -0,0 +1,18 @@
+import path from 'node:path';
+import { homedir } from 'node:os';
+
+/**
+ * Expand a leading ~ or ~/ (or ~\ on Windows) prefix to the user's home directory.
+ * Returns the path unchanged if it does not start with ~.
+ */
+export function expandHomePrefix(inputPath: string): string {
+  if (inputPath === '~') {
+    return homedir();
+  }
+
+  if (inputPath.startsWith('~/') || inputPath.startsWith('~\\')) {
+    return path.join(homedir(), inputPath.slice(2));
+  }
+
+  return inputPath;
+}

src/utils/project-config.ts

@@ -1,10 +1,10 @@
 import path from 'node:path';
-import { homedir } from 'node:os';
 import { fileURLToPath } from 'node:url';
 import { parse as parseYaml, stringify as stringifyYaml } from 'yaml';
 import type { FileSystemExecutor } from './FileSystemExecutor.ts';
 import type { SessionDefaults } from './session-store.ts';
 import { log } from './logger.ts';
+import { expandHomePrefix } from './expand-home.ts';
 import { removeUndefined } from './remove-undefined.ts';
 import { runtimeConfigFileSchema, type RuntimeConfigFile } from './runtime-config-schema.ts';
 import { normalizeSessionDefaultsProfileName } from './session-defaults-profile.ts';
@@ -126,19 +126,12 @@ function normalizePathValue(value: string, cwd: string): string {
     return fileUrlPath;
   }
 
-  if (value === '~') {
-    return homedir();
+  const expanded = expandHomePrefix(value);
+  if (path.isAbsolute(expanded)) {
+    return expanded;
   }
 
-  if (value.startsWith('~/')) {
-    return path.join(homedir(), value.slice(2));
-  }
-
-  if (path.isAbsolute(value)) {
-    return value;
-  }
-
-  return path.resolve(cwd, value);
+  return path.resolve(cwd, expanded);
 }
 
 function resolveRelativeSessionPaths(