Merge branch 'vacation-rescue-and-wrap'

Vacation rescue/wrap in allocation_service, new plan models/endpoints,
VacationRescueTip, useRescueDayActions, vacationSwaps util, sv+en i18n,
Dashboard/Calendar wiring.

Conflicts came from main's "day assertions" restructure and the earlier
merges; both intents kept:

- plan.py: both import sets; main's sync-with-wish handler kept next to the
  branch's new /rescue-days/dismiss endpoint; HTTP_422_UNPROCESSABLE_CONTENT
  applied to the branch's code (and a survivor in auth.py).
- Accepting a rescue day now goes through POST /api/day-assertions (an
  ad-hoc 'vacation' assertion, no wish) instead of /plan/apply with an
  `is_pinned` flag that no longer exists: on main a pin IS a day assertion
  (see PlanningService.add_planned_day's docstring), and an assertion is
  what keeps a later sync from retyping the day. useRescueDayActions,
  its tests, VacationRescueTip's tests and the backend integration flow
  follow that contract; applyPlan stays as a client for the live endpoint
  minus the dropped field. The hook also gets the security branch's
  useLatestRequest guard with an unconditionally cleared busy flag.
- Calendar.tsx: `locale` threaded into main's applyWishSyncResult call of
  buildSyncToastMessage (the branch's new parameter); the branch's
  swap-visibility toast tests drive the preset path through syncWithWish,
  which is how main saves a wish now.
- types/api.ts: ProposedDayApplyItem kept (used by applyPlan) without
  isPinned; the Add/UpdatePlannedDayRequest types stay removed as on main.
- fixtures/plan.ts: ResourceShortage import dropped (type removed on main).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01T4wjgbVL4HAC5Rdaw75VbV

frontend/tests/fixtures/plan.ts

@@ -16,6 +16,7 @@ import type {
   PoolBalance,
   ProposedDay,
   Rejection,
+  RescueDay,
   ShortfallRemedy,
   SurplusAdvice,
   VacationBalance,
@@ -126,6 +127,21 @@ export function makePlanAge4Projection(overrides: Partial<PlanAge4Projection> =
   }
 }
 
+/** §vacation-rescue — one suggest-only concrete date (see `RescueDay` in
+ * src/types/entities.ts). Defaults to a date within `makePlanProposal`'s
+ * implicit current-year assumption for tests that don't care about the
+ * exact date. */
+export function makeRescueDay(overrides: Partial<RescueDay> = {}): RescueDay {
+  return {
+    date: '2026-12-28',
+    parentPersonalDataUuid: 'pd-a',
+    childId: 'child-1',
+    year: 2026,
+    reason: 'vacation_rescue',
+    ...overrides,
+  }
+}
+
 export function makePlanProposal(overrides: Partial<PlanProposal> = {}): PlanProposal {
   return {
     days: [makeProposedDay()],
@@ -135,6 +151,7 @@ export function makePlanProposal(overrides: Partial<PlanProposal> = {}): PlanPro
     vacationBalances: [],
     surplusAdvice: [],
     age4Projections: [],
+    rescueDays: [],
     ...overrides,
   }
 }