Derive client domain types from the shared schema contracts

Add entity/response Zod schemas to @trek/shared (place, trip, assignment, day, budget, packing, reservation), each matched against the producing server service, and re-export them from client types.ts instead of the hand-written duplicates that had drifted (name/title, amount/total_price, owner_id/user_id, cover_url/cover_image, ...). Updates the call sites and test fixtures the corrected types surfaced; type-only, no runtime behaviour change.

shared/src/trip/trip.schema.ts

@@ -13,6 +13,51 @@ import { z } from 'zod';
  * permission checks + audit logging. Trip rows are wide, so responses stay open.
  */
 
+/**
+ * Trip entity as returned by the trip list / get / create / update endpoints
+ * (server/src/services/tripService.ts -> TRIP_SELECT). Columns of the `trips`
+ * table plus the computed list fields (day_count, place_count, is_owner as 0/1,
+ * owner_username, shared_count). `is_archived` is the raw SQLite INTEGER.
+ */
+export const tripSchema = z.object({
+  id: z.number(),
+  user_id: z.number(),
+  title: z.string(),
+  description: z.string().nullable().optional(),
+  start_date: z.string().nullable().optional(),
+  end_date: z.string().nullable().optional(),
+  currency: z.string(),
+  cover_image: z.string().nullable().optional(),
+  is_archived: z.number(),
+  reminder_days: z.number(),
+  created_at: z.string().optional(),
+  updated_at: z.string().optional(),
+  // computed in TRIP_SELECT (list/get)
+  day_count: z.number().optional(),
+  place_count: z.number().optional(),
+  is_owner: z.number().optional(),
+  owner_username: z.string().optional(),
+  shared_count: z.number().optional(),
+});
+export type Trip = z.infer<typeof tripSchema>;
+
+/**
+ * Trip member as returned by the members endpoint
+ * (server/src/services/tripService.ts -> listMembers). Owner + collaborators
+ * share this shape; `avatar_url` is resolved from the stored avatar.
+ */
+export const tripMemberSchema = z.object({
+  id: z.number(),
+  username: z.string(),
+  email: z.string().optional(),
+  avatar: z.string().nullable().optional(),
+  avatar_url: z.string().nullable().optional(),
+  role: z.string().optional(),
+  added_at: z.string().nullable().optional(),
+  invited_by_username: z.string().nullable().optional(),
+});
+export type TripMember = z.infer<typeof tripMemberSchema>;
+
 export const tripCreateRequestSchema = z.object({
   title: z.string().min(1),
   description: z.string().nullable().optional(),