fix(types): align Vue fallback declarations

The app and SDK ambient SFC declarations disagreed on indexed props. SDK-first declaration order reproduced all twelve Storybook default-argument errors. Use the same opaque fallback and compile existing stories under both declaration orders as a regression check.

packages/vue/src/global.d.ts

@@ -13,6 +13,7 @@ declare module '*?raw' {
 declare module '*.vue' {
   import type { DefineComponent } from 'vue'
 
-  const component: DefineComponent<Record<string, unknown>, Record<string, unknown>, unknown>
+  // Match the app's opaque fallback: an index signature breaks Storybook default-arg inference.
+  const component: DefineComponent<object, object, unknown>
   export default component
 }

tools/lint/tests/vue-module.test.ts

@@ -0,0 +1,47 @@
+import { expect, test } from 'bun:test'
+import { execFile } from 'node:child_process'
+import { mkdtemp, rm, writeFile } from 'node:fs/promises'
+import { tmpdir } from 'node:os'
+import { join, resolve } from 'node:path'
+import { promisify } from 'node:util'
+
+const execute = promisify(execFile)
+const root = resolve(import.meta.dir, '../../..')
+
+test.each(['app-first', 'sdk-first'])(
+  'Vue module declarations preserve Storybook default args (%s)',
+  async (order) => {
+    const directory = await mkdtemp(join(tmpdir(), 'open-pencil-vue-module-'))
+    try {
+      const declarations = [join(root, 'src/env.d.ts'), join(root, 'packages/vue/src/global.d.ts')]
+      if (order === 'sdk-first') declarations.reverse()
+      const project = join(directory, 'tsconfig.json')
+      await writeFile(
+        project,
+        JSON.stringify({
+          extends: join(root, 'tsconfig.json'),
+          include: [],
+          files: [
+            ...declarations,
+            join(root, 'src/components/ui/paint/FillSwatchTrigger.stories.ts')
+          ]
+        })
+      )
+      const result = await execute(
+        process.execPath,
+        [
+          join(root, 'node_modules/@typescript/native-preview/bin/tsgo'),
+          '--noEmit',
+          '--project',
+          project
+        ],
+        { cwd: root, timeout: 20_000, maxBuffer: 2 * 1024 * 1024 }
+      )
+      expect(result.stdout).toBe('')
+      expect(result.stderr).toBe('')
+    } finally {
+      await rm(directory, { recursive: true, force: true })
+    }
+  },
+  30_000
+)