[riversn]

Works together with the native driver fixes in dougforpres/SonyCamera#19.

An unattended sequence could not survive a USB drop: three native errors disabled the driver until N.I.N.A. restarted, the lost handle stayed registered in the native driver (so a later open reused a dead camera), and NINA dropped the camera from the sequence. Together with fixes in the native driver (dougforpres/SonyCamera), the plugin now recovers on its own.

SonyDriver (Sony.cs)

• Repeated native errors drop the handle instead of stopping the executor; only a hung P/Invoke (executor timeout) still requires a restart.
• A lost handle is closed in the native driver exactly once.
• ReopenCamera closes the stale handle, opens the camera again and re-attaches the lens. CanReopen / IsAwaitingReopen expose the state.
• Close timeout raised from 5 s to 30 s: the native close can wait 20 s for an operation in progress, which was being treated as a hang.

CameraDriver

• After a failed exposure, a failed status read or a lost handle, the next exposure reopens the camera first, waiting up to 2 minutes for it to come back (retry every second) instead of failing straight away, so a short drop costs one frame rather than the rest of the sequence. Abort or Disconnect ends the wait. Connected stays true while the camera can be reopened.
• After a reopen the requested ISO is restored once the camera reports its settings (a reopened camera reads 0 at first, and stepping from that left the wrong ISO), then verified and retried.
• An exposure that never finishes times out (2x its length + 2 minutes).
• Restarting while the camera still finishes a stopped exposure waits for it instead of failing every remaining frame in milliseconds.
• AbortExposure no longer warns "Abort requested" when NINA is only cleaning up after a failed exposure.
• Gains returns the same list instance while the ISO options are unchanged, so the Equipment > Camera "Default gain" dropdown no longer goes blank on reconnect.

FocuserDriver stays connected while the camera is being reopened.

Tests: simulator support for unplugging, reopens and unread ISO after a reopen, plus tests for each behaviour (133 passing).

Tested with an ILCE-7M3 and N.I.N.A. 3.2.0.9001: manual and natural USB drops recover without user action; a 7.7-hour run (7,790 exposures) was clean.