Lead the overview with the days about to be lost

The page opened with generic tiles and a bar reading forty-eight of ninety-six
weeks, which was neither weeks nor connected to the age-four ceiling it appeared
to describe. It is replaced by one headline and a bar per parent, in days,
against each parent's own savable limit as the server reports it.

The headline has two framings on the same arithmetic. Before anything is
planned it says what there is to plan and what will be lost without a plan,
because on the first day almost the whole entitlement is technically at risk
and saying so bluntly reads as an accusation. Once a plan exists it warns about
the days genuinely at stake.

A timeline of the years to the fourth birthday answers what the next four years
look like, which a month-at-a-time calendar cannot. Shortfalls, surplus advice
and balances sit below the fold, read-only: applying is automatic now, so a
second apply button would be a way to get two different answers.

Rejection messages move to one shared place that resolves a parent's name, so
an identifier can no longer surface in their place.

frontend/src/services/api.ts

@@ -21,11 +21,13 @@ import type {
   WorkspaceCreateRequest,
   WorkspaceUpdateRequest,
   WorkspaceOverview,
+  PlanSyncResponse,
 } from '@/types'
 import type {
   Workspace,
   LeaveWish,
   PlanProposal,
+  PlanChange,
   CostBreakdown,
   Tip,
   PlannedLeaveDay,
@@ -114,6 +116,7 @@ export interface RawAge4Projection {
   projected_left_at_b4: number
   savable_after_b4: number
   expiring_at_b4: number
+  savable_cap_at_b4: number
 }
 
 function toAge4Projection(raw: RawAge4Projection): Age4Projection {
@@ -128,6 +131,7 @@ function toAge4Projection(raw: RawAge4Projection): Age4Projection {
     projectedLeftAtB4: raw.projected_left_at_b4,
     savableAfterB4: raw.savable_after_b4,
     expiringAtB4: raw.expiring_at_b4,
+    savableCapAtB4: raw.savable_cap_at_b4,
   }
 }
 
@@ -232,6 +236,7 @@ interface RawLeaveWish {
   window_end_month: number
   window_end_day: number
   target_weeks: number
+  target_days?: number | null
   recurrence: 'yearly' | 'once'
   first_year: number
   last_year: number | null
@@ -255,6 +260,7 @@ function toLeaveWish(raw: RawLeaveWish): LeaveWish {
     windowEndMonth: raw.window_end_month,
     windowEndDay: raw.window_end_day,
     targetWeeks: raw.target_weeks,
+    targetDays: raw.target_days ?? null,
     recurrence: raw.recurrence,
     firstYear: raw.first_year,
     lastYear: raw.last_year,
@@ -782,6 +788,7 @@ export async function createLeaveWish(payload: LeaveWishCreateRequest): Promise<
       window_end_month: payload.windowEndMonth,
       window_end_day: payload.windowEndDay,
       target_weeks: payload.targetWeeks,
+      target_days: payload.targetDays ?? null,
       recurrence: payload.recurrence,
       first_year: payload.firstYear,
       last_year: payload.lastYear ?? null,
@@ -807,6 +814,7 @@ export async function updateLeaveWish(
   if (payload.windowEndMonth !== undefined) body.window_end_month = payload.windowEndMonth
   if (payload.windowEndDay !== undefined) body.window_end_day = payload.windowEndDay
   if (payload.targetWeeks !== undefined) body.target_weeks = payload.targetWeeks
+  if (payload.targetDays !== undefined) body.target_days = payload.targetDays
   if (payload.recurrence !== undefined) body.recurrence = payload.recurrence
   if (payload.firstYear !== undefined) body.first_year = payload.firstYear
   if (payload.lastYear !== undefined) body.last_year = payload.lastYear
@@ -902,6 +910,59 @@ export async function applyPlan(
   return toPlanApplyResponse(raw)
 }
 
+interface RawPlanChange {
+  kind: string
+  date: string
+  parent_personal_data_uuid: string
+  child_id: string
+  old_day_type: string | null
+  new_day_type: string | null
+  old_is_dubbeldag: boolean | null
+  new_is_dubbeldag: boolean | null
+  old_wish_id: string | null
+  new_wish_id: string | null
+}
+
+function toPlanChange(raw: RawPlanChange): PlanChange {
+  return {
+    kind: raw.kind as PlanChange['kind'],
+    date: raw.date,
+    parentPersonalDataUuid: raw.parent_personal_data_uuid,
+    childId: raw.child_id,
+    oldDayType: raw.old_day_type as PlanChange['oldDayType'],
+    newDayType: raw.new_day_type as PlanChange['newDayType'],
+    oldIsDubbeldag: raw.old_is_dubbeldag,
+    newIsDubbeldag: raw.new_is_dubbeldag,
+    oldWishId: raw.old_wish_id,
+    newWishId: raw.new_wish_id,
+  }
+}
+
+interface RawPlanSyncResponse {
+  proposal: RawPlanProposal
+  apply_result: RawPlanApplyResponse
+  changes: RawPlanChange[]
+}
+
+/** POST /api/plan/sync — the direct-manipulation calendar's one call:
+ * recompute the plan from the workspace's `LeaveWish`es and persist it in
+ * one step (no separate preview), never retyping/overwriting a pinned day,
+ * and reporting exactly what changed via `changes` so the UI can render a
+ * toast ("Sommar 2028 flyttades 2 dagar") instead of silently rewriting the
+ * calendar underneath the user.
+ */
+export async function syncPlan(workspaceId: string): Promise<PlanSyncResponse> {
+  const raw = (await apiFetch('/plan/sync', {
+    method: 'POST',
+    body: JSON.stringify({ workspace_id: workspaceId }),
+  })) as RawPlanSyncResponse
+  return {
+    proposal: toPlanProposal(raw.proposal),
+    applyResult: toPlanApplyResponse(raw.apply_result),
+    changes: raw.changes.map(toPlanChange),
+  }
+}
+
 // ---------------------------------------------------------------------------
 // Workspace members (used to resolve/select which parent a wish belongs to)
 // ---------------------------------------------------------------------------
@@ -975,6 +1036,10 @@ export interface CreatePlannedDayPayload {
   date: string
   day_type: 'sjukpenning' | 'lagsta' | 'vacation'
   is_dubbeldag?: boolean
+  // True for a day hand-edited through the calendar's day popover — the
+  // planner (POST /api/plan/sync) must not silently retype it. See
+  // `PlannedLeaveDay.isPinned`.
+  is_pinned?: boolean
 }
 
 export async function createPlannedDay(payload: CreatePlannedDayPayload): Promise<PlannedLeaveDay> {
@@ -988,6 +1053,8 @@ export async function createPlannedDay(payload: CreatePlannedDayPayload): Promis
 export interface UpdatePlannedDayPayload {
   day_type?: 'sjukpenning' | 'lagsta' | 'vacation'
   is_dubbeldag?: boolean
+  // See `CreatePlannedDayPayload.is_pinned`.
+  is_pinned?: boolean
 }
 
 export async function updatePlannedDay(id: string, payload: UpdatePlannedDayPayload): Promise<PlannedLeaveDay> {