Calendar: bring the other editors and generators up to the structure editor's standard #922

Key Maker approved the structure editor (#920) and added this on its Sign-offs card: "there is current editors/generators that we need to upgrade to match this level of quality and useability, but also account for the fact that large scale changes need to happen as well."

The calendar's other editing surfaces should match the structure editor's standard. That standard means: the whole thing editable in one place, a preview of what a change does before it saves, nothing deleted silently, and today's date never reset. These surfaces are:

• the era manager (eras card);
• event kinds;
• the weather generator and painting (Calendar V5: generated weather the Director can paint over by hand #765, Calendar: paint and generate weather on days in edit mode #910);
• the moon editor (only the hidden flag is writable today);
• the new-calendar wizard's other steps.

Large-scale changes: every editor should handle bulk edits, such as many eras or events at once, or shifting a whole range. A bulk change should preview its effect the same way a structure save does.

Each surface needs a before-and-after card on Sign-offs before it is built.

Generated by Claude Code