fix: make the native trigger disable/enable toggle actually save (#11024)

* feat: let a native trigger be disabled without deleting it

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* fix: show and control the native trigger pause outside the flow editor

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* fix: create a native trigger already paused instead of pausing it after

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* docs: correct the native trigger enabled comments for create-time init

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>