Fix: mock the new filter_selection_data request in Playwright e2e tests

CI (https://github.com/paperless-ngx/paperless-ngx/actions/runs/29777331059)
failed every e2e test that reloads the document list, with the browser
throwing "TypeError: Failed to fetch". Root cause: the e2e harness only
starts the Angular dev server (no real backend), and relies entirely on
page.routeFromHAR(..., { notFound: 'fallback' }) to mock API responses,
falling through to the real network for anything not in a recorded HAR.
The new GET /api/documents/filter_selection_data/ request added by this
branch fires on every non-search reload() and isn't in any pre-recorded
HAR fixture, so it fell through to a real network call with nothing
listening on the other end.

Added a shared mockFilterSelectionData() helper that stubs an empty
response for that endpoint, registered via test.beforeEach() before each
affected test's own routeFromHAR() call in every spec file that
exercises document-list reload (document-list, dashboard,
global-permissions, settings, document-detail). Playwright resolves
routes in reverse-registration order, so the later-registered HAR route
checks first, calls route.fallback() on a miss, and defers back to this
earlier-registered stub instead of hitting the network.

Not verified locally (Playwright browser binaries aren't installed in
this environment and the user preferred not to install them); relying
on CI to confirm.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src-ui/e2e/admin/settings.spec.ts

@@ -1,5 +1,10 @@
 import { expect, test } from '@playwright/test'
 import path from 'node:path'
+import { mockFilterSelectionData } from '../mock-filter-selection-data'
+
+test.beforeEach(async ({ page }) => {
+  await mockFilterSelectionData(page)
+})
 
 const REQUESTS_HAR = path.join(__dirname, 'requests/api-settings.har')
 

src-ui/e2e/dashboard/dashboard.spec.ts

@@ -1,5 +1,10 @@
 import { expect, test } from '@playwright/test'
 import path from 'node:path'
+import { mockFilterSelectionData } from '../mock-filter-selection-data'
+
+test.beforeEach(async ({ page }) => {
+  await mockFilterSelectionData(page)
+})
 
 const REQUESTS_HAR1 = path.join(__dirname, 'requests/api-dashboard1.har')
 const REQUESTS_HAR2 = path.join(__dirname, 'requests/api-dashboard2.har')

src-ui/e2e/document-detail/document-detail.spec.ts

@@ -1,5 +1,10 @@
 import { expect, test } from '@playwright/test'
 import path from 'node:path'
+import { mockFilterSelectionData } from '../mock-filter-selection-data'
+
+test.beforeEach(async ({ page }) => {
+  await mockFilterSelectionData(page)
+})
 
 const REQUESTS_HAR = path.join(__dirname, 'requests/api-document-detail.har')
 const REQUESTS_HAR2 = path.join(__dirname, 'requests/api-document-detail2.har')

src-ui/e2e/document-list/document-list.spec.ts

@@ -1,5 +1,10 @@
 import { expect, test } from '@playwright/test'
 import path from 'node:path'
+import { mockFilterSelectionData } from '../mock-filter-selection-data'
+
+test.beforeEach(async ({ page }) => {
+  await mockFilterSelectionData(page)
+})
 
 const REQUESTS_HAR1 = path.join(__dirname, 'requests/api-document-list1.har')
 const REQUESTS_HAR2 = path.join(__dirname, 'requests/api-document-list2.har')

src-ui/e2e/mock-filter-selection-data.ts

@@ -0,0 +1,27 @@
+import { Page } from '@playwright/test'
+
+const EMPTY_SELECTION_DATA = {
+  selected_correspondents: [],
+  selected_tags: [],
+  selected_document_types: [],
+  selected_storage_paths: [],
+  selected_custom_fields: [],
+}
+
+/**
+ * The document list now fires a GET to filter_selection_data on every
+ * non-search reload(), independent of and concurrent with the main list
+ * request. It's not present in any of the recorded HAR fixtures, so with
+ * `notFound: 'fallback'` it would otherwise fall through to the real
+ * network (nothing listens there in e2e, since only the frontend dev
+ * server is started) and fail every test that reloads the list.
+ *
+ * Playwright checks routes in reverse-registration order, so this must be
+ * registered before a test's own page.routeFromHAR() call for the HAR
+ * route's `notFound: 'fallback'` to defer back to this one.
+ */
+export async function mockFilterSelectionData(page: Page) {
+  await page.route('**/api/documents/filter_selection_data/**', (route) =>
+    route.fulfill({ json: EMPTY_SELECTION_DATA })
+  )
+}

src-ui/e2e/permissions/global-permissions.spec.ts

@@ -1,5 +1,10 @@
 import { expect, test } from '@playwright/test'
 import path from 'node:path'
+import { mockFilterSelectionData } from '../mock-filter-selection-data'
+
+test.beforeEach(async ({ page }) => {
+  await mockFilterSelectionData(page)
+})
 
 const REQUESTS_HAR = path.join(__dirname, 'requests/api-global-permissions.har')