* feat(scheduler): add helper text and risk badges to scheduled action picker
Add a concise helper text and risk level badge to every scheduled action
in the create/edit modal. The six risk levels (Safe, Read-only, Interruptive,
Runtime change, Removes containers, Destructive) map to the four existing
design-system tones and render as a small dot+label chip next to the helper
text, following the same pattern as SeverityBadge.
Fix an ambiguous mobile label: update + target_type: fleet now resolves
through resolveTaskAction and renders 'update node stacks' instead of the
misleading 'update fleet'.
Add exact helper-text and risk-level assertions for all 10 actions, plus
component tests for default modal state, action-switch scenarios, and
mobile update+fleet rendering.
* docs: update stale scheduled-operations alt text for changed helper text
Anso
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