Randomness 1.9.0

Added

• Reroll button on randomness codeblocks. Fenced ```randomness
  rollers now render a Reroll button beside their prompt controls, so
  an NPC or table roller embedded in a note can be re-rolled in place —
  the same affordance the .rdm file view and inline calls already
  had. Prompt selections are preserved across rerolls, and the button
  forces a fresh roll even when Stable codeblock seeds is on (the
  new result then persists across passive re-renders until the next
  reroll).