### What?
Refactors the `LeaveWithoutSaving` modal to be generic and delegates
document unlock logic back to the `DefaultEditView` component via a
callback.
### Why?
Previously, `unlockDocument` was triggered in a cleanup `useEffect` in
the edit view. When logging out from the edit view, the unlock request
would often fail due to the session ending — leaving the document in a
locked state.
### How?
- Introduced `onConfirm` and `onPrevent` props for `LeaveWithoutSaving`.
- Moved all document lock/unlock logic into `DefaultEditView`’s
`handleLeaveConfirm`.
- Captures the next navigation target via `onPrevent` and evaluates
whether to unlock based on:
- Locking being enabled.
- Current user owning the lock.
- Navigation not targeting internal admin views (`/preview`, `/api`,
`/versions`).
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Co-authored-by: Jarrod Flesch <jarrodmflesch@gmail.com>
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