monitors: keep the drag, freeze the cards while pending

The page's ScrollView took a vertical drag and cancelled the MouseArea,
leaving the monitor drawn at its offset with nothing written; it now
prevents stealing and clears the offset on cancel. A click without
movement no longer snaps. The cards are disabled while an Apply waits
for Keep, which writes the draft and so must not write untried edits.
The mode list comes from orig, which set() leaves alone, so an edit to
another field does not hand the ComboBox a new model.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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