fix(dashboard): restrict task deletion dropzone and mobile actions to creators

app/(app)/dashboard/card/Card.tsx

@@ -37,6 +37,7 @@ export default function Card({
     }
     e.dataTransfer.setData("text/plain", task.id);
     e.dataTransfer.setData("sourceStatus", task.status);
+    e.dataTransfer.setData("isCreator", String(task.isCreator ?? false));
     e.dataTransfer.effectAllowed = "move";
   };
 
@@ -88,6 +89,7 @@ export default function Card({
           <CardAvatars creator={task.creator} assignees={task.assignees} />
           <CardActions
             currentStatus={task.status}
+            isCreator={task.isCreator ?? false}
             onMove={handleMove}
             onDelete={() => onDelete?.(task.id)}
           />

app/(app)/dashboard/card/CardActions.tsx

@@ -21,10 +21,12 @@ import { COLUMNS, TaskStatus } from "@/types/tasks";
  */
 export default function CardActions({
   currentStatus,
+  isCreator,
   onMove,
   onDelete,
 }: {
   currentStatus: TaskStatus;
+  isCreator: boolean;
   onMove: (newStatus: TaskStatus) => void;
   onDelete: () => void;
 }) {
@@ -113,18 +115,22 @@ export default function CardActions({
             </button>
           );
         })}
-        <div className="h-px bg-border my-1" />
 
         {/* Delete Button */}
-        <button
-          onClick={handleDeleteClick}
-          className="w-full text-left px-3 py-2 rounded-lg hover:bg-destructive hover:text-foreground flex items-center justify-between text-destructive group/del transition-colors cursor-pointer font-medium"
-        >
-          <span className="flex items-center gap-2">
-            <Trash2 size={12} />
-            Delete Task
-          </span>
-        </button>
+        {isCreator && (
+          <>
+            <div className="h-px bg-border my-2" />
+            <button
+              onClick={handleDeleteClick}
+              className="w-full text-left px-3 py-2 rounded-lg hover:bg-destructive hover:text-foreground flex items-center justify-between text-destructive group/del transition-colors cursor-pointer font-medium"
+            >
+              <span className="flex items-center gap-2">
+                <Trash2 size={12} />
+                Delete Task
+              </span>
+            </button>
+          </>
+        )}
       </div>
     </div>
   );

app/(app)/dashboard/header/DeleteDropZone.tsx

@@ -1,6 +1,6 @@
 /**
  * @file dashboard/header/DeleteDropZone.tsx
- * @description Client component rendering an interactive drop zone for deleting tasks during drag-and-drop.
+ * @description Client component rendering an interactive drop zone for deleting tasks during drag-and-drop operations, managing drag state and drop actions.
  */
 
 "use client";
@@ -9,26 +9,49 @@ import { useState, useEffect } from "react";
 import { Trash2 } from "lucide-react";
 
 /**
- * Renders a drop target zone that appears dynamically during drag-and-drop operations,
- * allowing users to delete tasks by dragging them onto the designated area.
+ * Properties for the DeleteDropZone component.
  *
- * @param {Object} props - The component props.
- * @param {(taskId: string) => void} props.onTaskDelete - Callback triggered when a task is dropped into the delete zone.
- * @returns {JSX.Element | null} The rendered delete drop zone component, or null if no drag operation is active.
+ * @interface DeleteDropZoneProps
+ * @property {(taskId: string) => void} onTaskDelete - Callback triggered when a valid task is dropped onto the delete zone.
+ * @property {(isDragging: boolean) => void} onDragStateChange - Callback notified when drag status and permissions change globally.
+ */
+interface DeleteDropZoneProps {
+  onTaskDelete: (taskId: string) => void;
+  onDragStateChange: (isDragging: boolean) => void;
+}
+
+/**
+ * Renders a conditional delete drop zone during active drag events, enabling task deletion
+ * when dropped onto the target area if authorized.
+ *
+ * @param {DeleteDropZoneProps} props - The component props.
+ * @returns {JSX.Element | null} The rendered drop zone component or null if no authorized drag is active.
  */
 export default function DeleteDropZone({
   onTaskDelete,
-}: {
-  onTaskDelete: (taskId: string) => void;
-}) {
+  onDragStateChange,
+}: DeleteDropZoneProps) {
   const [isDragging, setIsDragging] = useState(false);
+  const [isAllowed, setIsAllowed] = useState(false);
   const [isOver, setIsOver] = useState(false);
 
   useEffect(() => {
-    const handleDragStart = () => setIsDragging(true);
+    const handleDragStart = (e: DragEvent) => {
+      const isCreatorString = e.dataTransfer?.getData("isCreator");
+      const allowed = isCreatorString === "true";
+
+      if (allowed) {
+        setIsDragging(true);
+        setIsAllowed(true);
+        onDragStateChange(true);
+      }
+    };
+
     const handleDragEnd = () => {
       setIsDragging(false);
+      setIsAllowed(false);
       setIsOver(false);
+      onDragStateChange(false);
     };
 
     window.addEventListener("dragstart", handleDragStart);
@@ -38,9 +61,9 @@ export default function DeleteDropZone({
       window.removeEventListener("dragstart", handleDragStart);
       window.removeEventListener("dragend", handleDragEnd);
     };
-  }, []);
+  }, [onDragStateChange]);
 
-  if (!isDragging) return null;
+  if (!isDragging || !isAllowed) return null;
 
   return (
     <div
@@ -58,7 +81,7 @@ export default function DeleteDropZone({
           onTaskDelete(taskId);
         }
       }}
-      className={`peer flex items-center gap-2 px-4 py-2.5 rounded-xl font-medium text-sm border-2 border-dashed cursor-pointer select-none transition-all duration-300 ease-out transform ${
+      className={`flex items-center gap-2 px-4 py-2.5 rounded-xl font-medium text-sm border-2 border-dashed cursor-pointer select-none transition-all duration-300 ease-out transform ${
         isOver
           ? "bg-destructive border-destructive scale-110 shadow-lg animate-pulse"
           : "bg-destructive/10 border-destructive/40 text-destructive scale-100 opacity-90 hover:opacity-100"

app/(app)/dashboard/header/Header.tsx

@@ -9,19 +9,28 @@ import { Sparkles } from "lucide-react";
 import DeleteDropZone from "./DeleteDropZone";
 import TrashLink from "./TrashLink";
 import NewTaskButton from "./NewTaskButton";
+import { useState } from "react";
+
+/**
+ * Properties for the Header component.
+ *
+ * @interface HeaderProps
+ * @property {(taskId: string) => void} onTaskDelete - Callback function triggered when a task is dropped into the delete zone.
+ */
+interface HeaderProps {
+  onTaskDelete: (taskId: string) => void;
+}
 
 /**
  * Renders the dashboard header section featuring title text, a task deletion drop zone,
- * a new task action button, and a link to the trash bin.
+ * and conditionally displays the new task action button and trash link based on the drag state.
  *
  * @param {HeaderProps} props - The component props.
  * @returns {JSX.Element} The rendered dashboard header component.
  */
-export default function Header({
-  onTaskDelete,
-}: {
-  onTaskDelete: (taskId: string) => void;
-}) {
+export default function Header({ onTaskDelete }: HeaderProps) {
+  const [isDraggingActive, setIsDraggingActive] = useState(false);
+
   return (
     <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-4">
       <div>
@@ -36,11 +45,16 @@ export default function Header({
       </div>
 
       <div className="flex items-center gap-3">
-        <DeleteDropZone onTaskDelete={onTaskDelete} />
-        <div className="flex items-center gap-3 peer-not-empty:hidden">
-          <NewTaskButton />
-          <TrashLink />
-        </div>
+        <DeleteDropZone
+          onTaskDelete={onTaskDelete}
+          onDragStateChange={setIsDraggingActive}
+        />
+        {!isDraggingActive && (
+          <div className="flex items-center gap-3 animate-in fade-in duration-200">
+            <NewTaskButton />
+            <TrashLink />
+          </div>
+        )}
       </div>
     </div>
   );

app/(app)/dashboard/page.tsx

@@ -4,17 +4,8 @@
  */
 
 import { db } from "@/db";
-import { tasksTable, taskAssigneesTable, usersTable } from "@/db/schema";
-import {
-  and,
-  count,
-  eq,
-  inArray,
-  isNotNull,
-  isNull,
-  or,
-  exists,
-} from "drizzle-orm";
+import { taskAssigneesTable, usersTable } from "@/db/schema";
+import { eq, inArray } from "drizzle-orm";
 import { auth } from "@/auth";
 import { redirect } from "next/navigation";
 import Board from "./Board";
@@ -65,8 +56,7 @@ export default async function Dashboard() {
     ...task,
     creator: creatorEmail,
     assignees: assigneesMap.get(task.id) || [],
-    tags: [],
-    commentsCount: 0,
+    isCreator: task.userId === currentUserId,
   }));
 
   return (

app/(app)/trash/page.tsx

@@ -4,7 +4,7 @@
  */
 
 import { db } from "@/db";
-import { tasksTable } from "@/db/schema";
+import { Task, tasksTable, usersTable } from "@/db/schema";
 import { eq, and, isNotNull } from "drizzle-orm";
 import { auth } from "@/auth";
 import { redirect } from "next/navigation";
@@ -22,20 +22,31 @@ export default async function TrashPage() {
   const session = await auth();
   if (!session?.user?.id) redirect("/login");
 
-  const trashedTasks = await db
-    .select()
+  const currentUserId = session.user.id;
+
+  const rawTrashedTasks = await db
+    .select({
+      task: tasksTable,
+      creatorEmail: usersTable.email,
+    })
     .from(tasksTable)
+    .innerJoin(usersTable, eq(tasksTable.userId, usersTable.id))
     .where(
       and(
-        eq(tasksTable.userId, session.user.id),
+        eq(tasksTable.userId, currentUserId),
         isNotNull(tasksTable.deletedAt),
       ),
     );
 
+  const tasks: Task[] = rawTrashedTasks.map(({ task }) => ({
+    ...task,
+    isCreator: task.userId === currentUserId,
+  }));
+
   return (
     <div className="space-y-8 max-w-7xl mx-auto pb-12">
       <TrashHeader />
-      <TrashList tasks={trashedTasks} />
+      <TrashList tasks={tasks} />
     </div>
   );
 }

types/tasks.ts

@@ -21,9 +21,9 @@ export type TaskPriority = (typeof taskPriorityEnum.enumValues)[number];
 // ==========================================
 
 export interface Task extends Omit<DbTask, "dueDate"> {
-  dueDate?: Date | null;
   assignees?: string[];
   creator?: string;
+  isCreator?: boolean;
 }
 
 export interface RouteContext {