fix(sia-video-source): preserve reload pauses

[pcfreak30]

Settles an armed pause confirmation before replaying a source after ATTACH_OK.

A pause issued during reload now updates playback preference before the host decides whether to send PLAY.

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Summary

Fixes an issue where a user pause triggered during a configuration reload could be lost, causing the reloaded video source to re-start playback instead of respecting the pause.

What changed

• When a reload re-attaches and replays the existing source, any provisional pause confirmation that is still pending is now settled before the playback state is re-evaluated.
• This prevents the reload from re-stating PLAY over a live user pause and then cancelling the pause confirmation as part of the load-state reset.
• The pause-confirmation handling was extracted into a shared helper used both by the scheduled timer and the reload path, keeping behavior consistent.
• Added a regression test that verifies a pause issued during a reload window is preserved and the rebuilt load does not emit a PLAY message.

[kody-ai]

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