Resolve the remaining client type errors and the trip.title navbar bug

Drive the client typecheck to zero without any/ts-ignore: convert the tripId route param to a number once at the page boundary so it matches the numeric props and store actions it feeds, fix trip.name -> trip.title (the wire field is title, so the old read rendered blank in the files/offline views), and tighten the scattered handler-arity, DOM-cast and untyped-payload sites. No runtime behaviour change.

client/tests/helpers/msw/handlers/budget.ts

@@ -26,7 +26,7 @@ export const budgetHandlers = [
 
   http.put('/api/trips/:id/budget/:itemId/members', async ({ params, request }) => {
     const body = await request.json() as { user_ids: number[] };
-    const members = body.user_ids.map(uid => ({ user_id: uid, paid: false }));
+    const members = body.user_ids.map(uid => ({ user_id: uid, paid: 0, username: `user${uid}` }));
     const item = buildBudgetItem({ id: Number(params.itemId), trip_id: Number(params.id), persons: body.user_ids.length, members });
     return HttpResponse.json({ members, item });
   }),

client/tests/helpers/render.tsx

@@ -1,10 +1,10 @@
 import React from 'react';
 import { render, type RenderOptions } from '@testing-library/react';
-import { MemoryRouter } from 'react-router-dom';
+import { MemoryRouter, type MemoryRouterProps } from 'react-router-dom';
 import { TranslationProvider } from '../../src/i18n/TranslationContext';
 
 interface RenderWithProvidersOptions extends Omit<RenderOptions, 'wrapper'> {
-  initialEntries?: string[];
+  initialEntries?: MemoryRouterProps['initialEntries'];
 }
 
 function renderWithProviders(

client/tests/integration/hooks/useDayNotes.test.ts

@@ -439,9 +439,10 @@ describe('useDayNotes', () => {
   });
 });
 
-// Type augment for window.__addToast
+// Type augment for window.__addToast — must mirror the canonical declaration
+// in components/shared/Toast.tsx (a divergent signature is a merge conflict).
 declare global {
   interface Window {
-    __addToast?: (message: string, type: string, duration?: number) => void;
+    __addToast?: (message: string, type?: 'success' | 'error' | 'warning' | 'info', duration?: number) => number;
   }
 }

client/tests/integration/hooks/useRouteCalculation.test.ts

@@ -26,10 +26,15 @@ function buildMockStore(assignments: Record<string, ReturnType<typeof buildAssig
 
 const MOCK_SEGMENTS: RouteSegment[] = [
   {
+    mid: [48.5, 2.5],
+    from: [48.86, 2.35],
+    to: [48.21, 16.37],
     distance: 343000,
     duration: 12600,
     distanceText: '343 km',
     durationText: '3 h 30 min',
+    walkingText: '70 h',
+    drivingText: '3 h 30 min',
   },
 ];