Fix dotenv discovery to support hyphenated config names

The regex filter in discoverDotEnvFiles used \w+ which excludes
hyphens, so .env.my-staging would not be discovered for a
shopify.app.my-staging.toml config. Change to [\w-]+ to match
the config shorthand naming convention.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ryancbahan

packages/app/src/cli/models/project/config-selection.test.ts

@@ -58,6 +58,18 @@ describe('resolveDotEnv', () => {
       expect(dotenv).toBeUndefined()
     })
   })
+
+  test('returns config-specific dotenv for hyphenated config name', async () => {
+    await inTemporaryDirectory(async (dir) => {
+      await writeFile(joinPath(dir, '.env.my-staging'), 'KEY=my-staging')
+      await writeFile(joinPath(dir, 'shopify.app.my-staging.toml'), 'client_id = "x"')
+      const project = await setupProject(dir)
+
+      const dotenv = resolveDotEnv(project, joinPath(dir, 'shopify.app.my-staging.toml'))
+
+      expect(dotenv!.variables.KEY).toBe('my-staging')
+    })
+  })
 })
 
 describe('resolveHiddenConfig', () => {

packages/app/src/cli/models/project/project.ts

@@ -223,7 +223,7 @@ async function discoverDotEnvFiles(directory: string): Promise<Map<string, DotEn
   const paths = await glob(pattern, {dot: true})
   const validPaths = paths.filter((filePath) => {
     const fileName = basename(filePath)
-    return fileName === '.env' || /^\.env\.\w+$/.test(fileName)
+    return fileName === '.env' || /^\.env\.[\w-]+$/.test(fileName)
   })
 
   const entries = await Promise.all(