feat: add select all action to trash (#15556)

<img width="284" height="132" alt="image"
src="https://github.com/user-attachments/assets/a11f1919-ac91-4f87-b03d-4fab6e8cba7e"
/>


## Description

Add a select-all action next to the Trash page title after document
multi-selection starts.

- Select every unique document ID from the explorer groups, including
items outside the rendered viewport.
- Change the action to Clear selection when every Trash document is
selected.
- Reuse the existing Trash bulk-operation permissions without
introducing artificial grouping.

## Testing

- Trash page Playwright E2E: 2 passed
- Targeted TypeScript project build
- lint-staged
- lint:ox
- oxfmt --check
- git diff --check

## Checklist

- [x] I have signed the AFFiNE Contributor License Agreement
- [x] The PR targets the canary branch and its title follows
Conventional Commits
- [x] Tests are added or updated where it makes sense
- [ ] Full yarn lint and yarn typecheck pass locally

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- Added a select-all and clear-selection control to the Trash view when
multiple documents can be managed.
  - Select-all actions now update the document selection toolbar.

- **Bug Fixes**
- Improved Trash view controls for users with administrator or owner
permissions.

- **Tests**
- Added end-to-end coverage for selecting, selecting all, and clearing
multiple trashed documents.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/core/src/desktop/pages/workspace/trash-page.css.ts

@@ -1,4 +1,5 @@
 import { cssVar } from '@toeverything/theme';
+import { cssVarV2 } from '@toeverything/theme/v2';
 import { style } from '@vanilla-extract/css';
 export const trashTitle = style({
   display: 'flex',
@@ -19,3 +20,11 @@ export const trashIcon = style({
   color: cssVar('iconColor'),
   fontSize: cssVar('fontH5'),
 });
+export const selectAllButton = style({
+  height: 24,
+  padding: '2px 4px',
+  color: cssVarV2.text.secondary,
+  fontSize: 12,
+  fontWeight: 400,
+  lineHeight: '20px',
+});

packages/frontend/core/src/desktop/pages/workspace/trash-page.tsx

@@ -1,4 +1,4 @@
-import { toast, useConfirmModal } from '@affine/component';
+import { Button, toast, useConfirmModal } from '@affine/component';
 import {
   createDocExplorerContext,
   DocExplorerContext,
@@ -12,7 +12,7 @@ import { WorkspacePermissionService } from '@affine/core/modules/permissions';
 import { useI18n } from '@affine/i18n';
 import { DeleteIcon } from '@blocksuite/icons/rc';
 import { useLiveData, useService } from '@toeverything/infra';
-import { useCallback, useEffect, useState } from 'react';
+import { useCallback, useContext, useEffect, useMemo, useState } from 'react';
 
 import {
   useIsActiveView,
@@ -24,14 +24,48 @@ import {
 import { EmptyPageList } from './page-list-empty';
 import * as styles from './trash-page.css';
 
-const TrashHeader = () => {
+const TrashHeader = ({ canManageTrash }: { canManageTrash: boolean }) => {
   const t = useI18n();
+  const contextValue = useContext(DocExplorerContext);
+  const groups = useLiveData(contextValue.groups$);
+  const selectMode = useLiveData(contextValue.selectMode$);
+  const selectedDocIds = useLiveData(contextValue.selectedDocIds$);
+
+  const allDocIds = useMemo(
+    () => Array.from(new Set(groups.flatMap(group => group.items))),
+    [groups]
+  );
+  const allSelected = useMemo(() => {
+    const selectedDocIdSet = new Set(selectedDocIds);
+    return (
+      allDocIds.length > 0 && allDocIds.every(id => selectedDocIdSet.has(id))
+    );
+  }, [allDocIds, selectedDocIds]);
+
+  const handleToggleSelectAll = useCallback(() => {
+    contextValue.selectedDocIds$.next(allSelected ? [] : allDocIds);
+    contextValue.prevCheckAnchorId$?.next(null);
+  }, [allDocIds, allSelected, contextValue]);
+
   return (
     <Header
       left={
         <div className={styles.trashTitle}>
           <DeleteIcon className={styles.trashIcon} />
           {t['com.affine.workspaceSubPath.trash']()}
+          {selectMode && canManageTrash && allDocIds.length > 0 ? (
+            <Button
+              className={styles.selectAllButton}
+              data-testid="trash-select-all"
+              onClick={handleToggleSelectAll}
+              size="custom"
+              variant="plain"
+            >
+              {allSelected
+                ? t['com.affine.page.group-header.clear']()
+                : t['com.affine.page.group-header.select-all']()}
+            </Button>
+          ) : null}
         </div>
       }
     />
@@ -69,6 +103,7 @@ export const TrashPage = () => {
 
   const isAdmin = useLiveData(permissionService.permission.isAdmin$);
   const isOwner = useLiveData(permissionService.permission.isOwner$);
+  const canManageTrash = !!isAdmin || !!isOwner;
   const groups = useLiveData(explorerContextValue.groups$);
   const isEmpty =
     groups.length === 0 ||
@@ -171,7 +206,7 @@ export const TrashPage = () => {
       <ViewTitle title={t['Trash']()} />
       <ViewIcon icon={'trash'} />
       <ViewHeader>
-        <TrashHeader />
+        <TrashHeader canManageTrash={canManageTrash} />
       </ViewHeader>
       <ViewBody>
         <div className={styles.body}>
@@ -179,11 +214,9 @@ export const TrashPage = () => {
             <EmptyPageList type="trash" />
           ) : (
             <DocsExplorer
-              disableMultiDelete={!isAdmin && !isOwner}
-              onRestore={isAdmin || isOwner ? handleMultiRestore : undefined}
-              onDelete={
-                isAdmin || isOwner ? onConfirmPermanentlyDelete : undefined
-              }
+              disableMultiDelete={!canManageTrash}
+              onRestore={canManageTrash ? handleMultiRestore : undefined}
+              onDelete={canManageTrash ? onConfirmPermanentlyDelete : undefined}
             />
           )}
         </div>