test: cover field-setter command failure branches

Added ERT tests that the four field setters preserve local org state when the issueUpdate mutation fails (returns :success nil): set-priority keeps the cookie, set-state keeps the TODO keyword and LINEAR-STATE drawer, set-assignee keeps the assignee drawer, set-labels keeps the labels drawer. Each test also asserts the push was attempted with the intended input, so a regression that simply stopped calling the API would still fail rather than pass silently. The commands already behave correctly — this locks it. 357 tests green.

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