fix(clipboard): avoid sync event backpressure

[shideneyu]

Summary

Fix clipboard sync instability when multiple devices are connected.

The sync runner was sending status events through a bounded channel using awaited sends. In long-running or multi-device clipboard sync sessions, this could allow the status event channel to apply backpressure
to the actual clipboard sync tasks.

This change makes sync status event delivery non-blocking, so a full status channel can no longer stall clipboard synchronization.

Changes

• Increase the sync event channel capacity from 32 to 128.
• Replace blocking .send(...).await calls for sync status events with non-blocking try_send(...).
• Drop only status/debug events when the channel is full, not clipboard content.

[sanchxt]

This PR appears to downgrade the workspace version from 0.2.0 on main to 0.1.7 in Cargo.toml/Cargo.lock. Could you please fix that?

[shideneyu]

Fixed, thanks.

Sorry about the force-push earlier. I should have kept the review history cleaner.

The force-push from e954429 to c86dad1 only reverts the accidental version downgrade:

• Cargo.toml: restored workspace version to 0.2.0
• Cargo.lock: restored yoop and yoop-core to 0.2.0

The clipboard backpressure change itself is unchanged.