feat(filters): pass timezone down when filtering with relative date math

Resolves https://community.vikunja.io/t/my-vikunja-instance-creates-tasks-with-due-date-time-of-9am-for-tasks-with-the-word-today-word-in-it/2105/8

frontend/src/views/project/helpers/useGanttTaskList.ts

@@ -9,6 +9,7 @@ import TaskService from '@/services/task'
 
 import TaskModel from '@/models/task'
 import {error, success} from '@/message'
+import {useAuthStore} from '@/stores/auth'
 
 // FIXME: unify with general `useTaskList`
 export function useGanttTaskList<F extends Filters>(
@@ -21,12 +22,18 @@ export function useGanttTaskList<F extends Filters>(
 	}) {
 	const taskCollectionService = shallowReactive(new TaskCollectionService())
 	const taskService = shallowReactive(new TaskService())
+	const authStore = useAuthStore()
 
 	const isLoading = computed(() => taskCollectionService.loading)
 
 	const tasks = ref<Map<ITask['id'], ITask>>(new Map())
 
 	async function fetchTasks(params: TaskFilterParams, page = 1): Promise<ITask[]> {
+		
+		if(params.filter_timezone === '') {
+			params.filter_timezone = authStore.settings.timezone
+		}
+		
 		const tasks = await taskCollectionService.getAll({projectId: filters.value.projectId}, params, page) as ITask[]
 		if (options.loadAll && page < taskCollectionService.totalPages) {
 			const nextTasks = await fetchTasks(params, page + 1)

frontend/src/views/tasks/ShowTasks.vue

@@ -85,6 +85,7 @@ import type {ITask} from '@/modelTypes/ITask'
 import {useAuthStore} from '@/stores/auth'
 import {useTaskStore} from '@/stores/tasks'
 import {useProjectStore} from '@/stores/projects'
+import type {TaskFilterParams} from '@/services/taskCollection'
 
 // Linting disabled because we explicitely enabled destructuring in vite's config, this will work.
 // eslint-disable-next-line vue/no-setup-props-destructure
@@ -184,6 +185,7 @@ async function loadPendingTasks(from: string, to: string) {
 	const params = {
 		sortBy: ['due_date', 'id'],
 		orderBy: ['asc', 'desc'],
+		filterTimezone: authStore.settings.timezone,
 		filterBy: ['done'],
 		filterValue: ['false'],
 		filterComparator: ['equals'],