## Bug Explanation
- The Super Admin limits form renders inputs by iterating the keys of
`account.limits`.
- When `account.limits` was present, `AccountLimitsField#to_s` returned
only that hash (no defaults).
- On save, `SuperAdmin::AccountsController` compacts the limits hash,
removing blank keys.
- Result: if only one key (e.g., `agents`) was saved, the other keys
were missing from the hash and their fields disappeared on the next
render.
## Fix
- Always start from a defaults hash of all expected limit keys and merge
in any saved overrides.
- This keeps the UI stable and ensures all limit inputs remain visible
even when the stored hash is partial.
- Upgraded meta_request to `0.8.5` to stop a dev‑only `SystemStackError`
caused by JSON‑encoding ActiveRecord::Transaction in Rails 7.2. No
production behavior changes.
## Reproduction Steps
1. In Super Admin, edit an account and set only `agents` in the limits;
leave other limit fields blank and save.
2. Re-open the same account in Super Admin.
3. Observe that only `agents` is rendered and other limit fields are
missing.
## Testing
- Tested on UI
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Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
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