Fix race condition where Epic form checked user authentication before
Zustand persist middleware completed hydration from localStorage.
Root cause:
- authStore uses persist middleware to restore from localStorage
- Hydration is asynchronous
- Epic form checked user state before hydration completed
- Result: "User not authenticated" error on page refresh
Changes:
- Add isHydrated state to authStore interface
- Add onRehydrateStorage callback to track hydration completion
- Update epic-form to check isHydrated before checking user
- Disable submit button until hydration completes
- Show "Loading..." button text during hydration
- Improve error messages for better UX
- Add console logging to track hydration process
Testing:
- Page refresh should now wait for hydration
- Epic form correctly identifies logged-in users
- Submit button disabled until auth state ready
- Clear user feedback during loading state
Fixes: Epic creation "User not authenticated" error on refresh
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Co-Authored-By: Claude <noreply@anthropic.com>
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