Fix skeleton entry deletion and add hide suggestions toggle (#619)

- Revert filled skeleton entries back to skeleton on delete instead of permanently removing them
- Add per-user hide_skeletons preference on journey_contributors (migration 99)
- Add PATCH /journeys/:id/preferences endpoint for toggling skeleton visibility
- Add Eye/EyeOff toggle button with custom tooltip in journey detail header
- Filter skeleton entries from timeline when hidden
- Add i18n keys for all 14 languages

client/src/api/client.ts

@@ -322,6 +322,9 @@ export const journeyApi = {
   updateContributor: (id: number, userId: number, role: string) => apiClient.patch(`/journeys/${id}/contributors/${userId}`, { role }).then(r => r.data),
   removeContributor: (id: number, userId: number) => apiClient.delete(`/journeys/${id}/contributors/${userId}`).then(r => r.data),
 
+  // Preferences
+  updatePreferences: (id: number, data: { hide_skeletons?: boolean }) => apiClient.patch(`/journeys/${id}/preferences`, data).then(r => r.data),
+
   // Share
   getShareLink: (id: number) => apiClient.get(`/journeys/${id}/share-link`).then(r => r.data),
   createShareLink: (id: number, perms: { share_timeline?: boolean; share_gallery?: boolean; share_map?: boolean }) => apiClient.post(`/journeys/${id}/share-link`, perms).then(r => r.data),