feat: nation-op split/merge review — dialog (part list + successor radio, merge name), docs (P4b, #16)

src/lib/api.ts

@@ -62,10 +62,13 @@ export const api = {
       method: 'POST',
       body: JSON.stringify({ index }),
     }),
-  // (v0.23, #16 P4a) Confirm a pending nation-op proposal by its index in
-  // `game.pendingNationOps` (a rename takes effect; `edits.name` overrides the
-  // proposed name). Fast, non-LLM — no turn advance. Returns the updated game.
-  confirmNationOp: (id: string, index: number, edits?: { name?: string }) =>
+  // (v0.23, #16 P4a; v0.24, #16 P4b) Confirm a pending nation-op proposal by
+  // its index in `game.pendingNationOps`: a rename takes effect (`edits.name`
+  // overrides the proposed name), a split partitions the nation's territory
+  // (`edits.playerPart` picks which part the player leads, default 0), and a
+  // merge folds its inputs into the survivor (`edits.name` overrides the
+  // merged name). Fast, non-LLM — no turn advance. Returns the updated game.
+  confirmNationOp: (id: string, index: number, edits?: { name?: string; playerPart?: number }) =>
     req<ConfirmNationOpResponse>(`/api/games/${id}/nation-op/confirm`, {
       method: 'POST',
       body: JSON.stringify({ index, ...(edits ? { edits } : {}) }),