Edit markers

[rawcomposition]

Add ability to edit custom markers from within the marker modal.

[Copilot]

Pull Request Overview

This PR adds the ability to edit custom markers directly from the marker modal. Key changes include:

• Renaming and updating marker input types (including renaming MarkerInput to MarkerUpdateInput and adding an "icon" field).
• Updating the trip provider and modal configuration to support the new marker editing functionality.
• Removing the old AddMarker and ViewMarker modals and replacing them with a unified Marker modal, along with backend support for marker updates.

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
shared/types.ts	Renaming MarkerInput to MarkerUpdateInput and updating its fields.
frontend/providers/trip.tsx	Adding/refactoring the trip context to include a refetch method.
frontend/providers/modals.tsx	Adjusting modal imports and mapping to use the new Marker component.
frontend/pages/whats-new.tsx	Updating release notes to announce marker edit capabilities.
frontend/modals/ViewMarker.tsx	Removing the old view marker modal.
frontend/modals/Marker.tsx	Creating the new unified marker modal for add/edit functionality.
frontend/modals/AddMarker.tsx	Removing the old add marker modal.
frontend/components/Mapbox.tsx	Updating marker click handling to pass markerId to the modal.
frontend/components/ItineraryDay.tsx	Modifying modal calls to pass markerId instead of the full marker object.
backend/routes/trips/[tripId]/markers.ts	Adding a PATCH endpoint to update marker details on the backend.

Comments suppressed due to low confidence (1)

shared/types.ts:205

• Consider documenting the separation between MarkerUpdateInput and MarkerNotesInput since the optional 'notes' field was removed; this will clarify that note updates are handled separately.

export type MarkerUpdateInput = {