Let a household choose to be paid for the red days

Asking for a full week off never spent anything on the Saturday, the
Sunday or a holiday, and a test now says so outright rather than leaving
it to be rediscovered. Those days are free because vacation cannot be
taken on a day that is not a working day.

Parental benefit is a payment rather than a schedule, though, so it can
be drawn on a red day to turn an unpaid day off into a paid one — at the
cost of a day the family would otherwise keep. That is now a workspace
setting, off by default, and it never reaches for a vacation day. With it
off the planner behaves exactly as before.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ei7gCZzdd751uZtPzb1Pep

frontend/src/services/api.ts

@@ -458,6 +458,7 @@ interface RawWorkspace {
   id: string
   name: string
   created_at: string
+  take_pl_on_red_days: boolean
 }
 
 function toWorkspace(raw: RawWorkspace): Workspace {
@@ -465,6 +466,7 @@ function toWorkspace(raw: RawWorkspace): Workspace {
     id: raw.id,
     name: raw.name,
     createdAt: raw.created_at,
+    takePlOnRedDays: raw.take_pl_on_red_days,
   }
 }
 
@@ -716,6 +718,7 @@ export async function updateWorkspace(
     method: 'PUT',
     body: JSON.stringify({
       name: req.name,
+      take_pl_on_red_days: req.takePlOnRedDays,
     }),
   })) as RawWorkspace
   return toWorkspace(raw)