Improved attack and save lines

Attack and saving-throw lines can now express much more of what real 2024 monsters do. An attack can carry a second damage clause, like "plus 4 (1d8) Acid damage", and can inflict an effect on hit that reads as part of the sentence: "…damage, and the target has the Grappled condition".

Saving throws gained the same reach. They can name who has to save, such as "each creature in a 60-foot Cone", say what a failed save does beyond damage, and add a "Failure or Success" clause for effects that land either way. Conditions work inside those clauses, so {@condition prone} renders properly.

With all these fields, the click-to-edit popup grew into a proper dialog: plain language field names, a preview pane that highlights the derived numbers, and the save DC and average damage at a glance. Edits apply when you press Add or Save, so Cancel backs out cleanly. Existing lines keep working exactly as they were.