fix: make store exports callable (Pinia composable pattern)

defineStore returns the store object directly, not a function.
Wrap in a function so useSidebar() works as a composable call.

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

Author: glennmichael123

packages/devtools/stores/sidebar.ts

@@ -1,8 +1,12 @@
 /**
  * Sidebar collapse state store with persistence.
+ *
+ * Usage: const { collapsed, toggle } = useSidebar()
  */
-export const useSidebar = defineStore('sidebar', () => {
-  const collapsed = state(false)
-  function toggle() { collapsed.set(!collapsed()) }
-  return { collapsed, toggle }
-}, { persist: true })
+export function useSidebar() {
+  return defineStore('sidebar', () => {
+    const collapsed = state(false)
+    function toggle() { collapsed.set(!collapsed()) }
+    return { collapsed, toggle }
+  }, { persist: true })
+}