feat(frontend): preserve Gantt date range when switching views (#2141)

Adds a `viewFilters` Pinia store that stores query params per view ID to sync Gantt filters to the store whenever they change. This persists the custom date ranges when switching between views.

Fixes #2124

frontend/src/components/project/ProjectWrapper.vue

@@ -23,7 +23,7 @@
 					:key="view.id"
 					class="switch-view-button"
 					:class="{'is-active': view.id === viewId}"
-					:to="{ name: 'project.view', params: { projectId, viewId: view.id } }"
+					:to="getViewRoute(view)"
 				>
 					{{ getViewTitle(view) }}
 				</BaseButton>
@@ -57,6 +57,7 @@ import {useTitle} from '@/composables/useTitle'
 
 import {useBaseStore} from '@/stores/base'
 import {useProjectStore} from '@/stores/projects'
+import {useViewFiltersStore} from '@/stores/viewFilters'
 
 import type {IProject} from '@/modelTypes/IProject'
 import type {IProjectView} from '@/modelTypes/IProjectView'
@@ -71,6 +72,7 @@ const {t} = useI18n()
 
 const baseStore = useBaseStore()
 const projectStore = useProjectStore()
+const viewFiltersStore = useViewFiltersStore()
 
 const currentProject = computed<IProject>(() => {
 	return baseStore.currentProject || {
@@ -95,9 +97,18 @@ function getViewTitle(view: IProjectView) {
 		case 'Kanban':
 			return t('project.kanban.title')
 	}
-	
+
 	return view.title
 }
+
+function getViewRoute(view: IProjectView) {
+	const storedQuery = viewFiltersStore.getViewQuery(view.id)
+	return {
+		name: 'project.view',
+		params: {projectId: props.projectId, viewId: view.id},
+		query: storedQuery,
+	}
+}
 </script>
 
 <style lang="scss" scoped>

frontend/src/stores/viewFilters.test.ts

@@ -0,0 +1,41 @@
+import {describe, it, expect, beforeEach} from 'vitest'
+import {setActivePinia, createPinia} from 'pinia'
+import {useViewFiltersStore} from './viewFilters'
+
+describe('viewFilters store', () => {
+	beforeEach(() => {
+		setActivePinia(createPinia())
+	})
+
+	it('should store and retrieve query params for a view', () => {
+		const store = useViewFiltersStore()
+
+		store.setViewQuery(18, {dateFrom: '2026-01-01', dateTo: '2026-01-31'})
+
+		expect(store.getViewQuery(18)).toEqual({dateFrom: '2026-01-01', dateTo: '2026-01-31'})
+	})
+
+	it('should return empty object for views without stored params', () => {
+		const store = useViewFiltersStore()
+
+		expect(store.getViewQuery(999)).toEqual({})
+	})
+
+	it('should clear query params for a view', () => {
+		const store = useViewFiltersStore()
+
+		store.setViewQuery(18, {dateFrom: '2026-01-01', dateTo: '2026-01-31'})
+		store.clearViewQuery(18)
+
+		expect(store.getViewQuery(18)).toEqual({})
+	})
+
+	it('should update existing query params', () => {
+		const store = useViewFiltersStore()
+
+		store.setViewQuery(18, {dateFrom: '2026-01-01', dateTo: '2026-01-31'})
+		store.setViewQuery(18, {dateFrom: '2026-02-01', dateTo: '2026-02-28'})
+
+		expect(store.getViewQuery(18)).toEqual({dateFrom: '2026-02-01', dateTo: '2026-02-28'})
+	})
+})

frontend/src/stores/viewFilters.ts

@@ -0,0 +1,27 @@
+import {defineStore} from 'pinia'
+import {ref} from 'vue'
+import type {LocationQueryRaw} from 'vue-router'
+import type {IProjectView} from '@/modelTypes/IProjectView'
+
+export const useViewFiltersStore = defineStore('viewFilters', () => {
+	const viewQueries = ref<Record<IProjectView['id'], LocationQueryRaw>>({})
+
+	function setViewQuery(viewId: IProjectView['id'], query: LocationQueryRaw) {
+		viewQueries.value[viewId] = query
+	}
+
+	function getViewQuery(viewId: IProjectView['id']): LocationQueryRaw {
+		return viewQueries.value[viewId] ?? {}
+	}
+
+	function clearViewQuery(viewId: IProjectView['id']) {
+		delete viewQueries.value[viewId]
+	}
+
+	return {
+		viewQueries,
+		setViewQuery,
+		getViewQuery,
+		clearViewQuery,
+	}
+})

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

@@ -1,5 +1,7 @@
-import type {Ref} from 'vue'
-import type {RouteLocationNormalized, RouteLocationRaw} from 'vue-router'
+import {watch, type Ref} from 'vue'
+import type {RouteLocationNormalized, RouteLocationRaw, LocationQueryRaw} from 'vue-router'
+
+import {useViewFiltersStore} from '@/stores/viewFilters'
 
 import {isoToKebabDate} from '@/helpers/time/isoToKebabDate'
 import {parseDateProp} from '@/helpers/time/parseDateProp'
@@ -98,6 +100,8 @@ export type UseGanttFiltersReturn =
 	UseGanttTaskListReturn
 
 export function useGanttFilters(route: Ref<RouteLocationNormalized>, viewId: Ref<IProjectView['id']>): UseGanttFiltersReturn {
+	const viewFiltersStore = useViewFiltersStore()
+
 	const {
 		filters,
 		hasDefaultFilters,
@@ -110,6 +114,21 @@ export function useGanttFilters(route: Ref<RouteLocationNormalized>, viewId: Ref
 		['project.view'],
 	)
 
+	// Sync filters to store whenever they change (for view tab navigation)
+	watch(
+		filters,
+		(newFilters) => {
+			const routeLocation = ganttFiltersToRoute(newFilters)
+			const query = routeLocation.query as LocationQueryRaw
+			if (query && Object.keys(query).length > 0) {
+				viewFiltersStore.setViewQuery(viewId.value, query)
+			} else {
+				viewFiltersStore.clearViewQuery(viewId.value)
+			}
+		},
+		{immediate: true, deep: true},
+	)
+
 	const {
 		tasks,
 		loadTasks,