## Summary
* **What is the goal of this PR?**
* Make manual clock sync work even when the device is not already
connected to Wi-Fi, so the user can start the sync flow directly from
settings instead of being blocked by connection state.
* **What changes are included?**
* `ClockSyncActivity` now launches the normal Wi-Fi selection flow
before syncing when the device is offline.
* After Wi-Fi selection succeeds, clock sync resumes automatically and
performs the existing forced NTP sync.
* If clock sync had to bring Wi-Fi up, the activity disconnects and uses
the existing silent restart cleanup path to avoid leaving the device in
a fragmented post-Wi-Fi heap state.
* The completion UI now only advertises Back, matching the updated input
handling.
## Additional Context
* Existing behavior is unchanged when Wi-Fi is already connected: the
activity syncs immediately.
* Cancelling Wi-Fi selection exits the clock sync flow.
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### AI Usage
While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it
helps set the right context for reviewers.
Did you use AI tools to help write this code? _**< YES >**_
Julia