feat(dashboard): add drag-to-delete and mobile delete actions

app/(app)/dashboard/KanbanBoard.tsx

@@ -1,6 +1,6 @@
 /**
  * @file dashboard/KanbanBoard.tsx
- * @description Client component wrapping the kanban columns grid, tracking individual task update states, and handling asynchronous status mutations via API.
+ * @description Client component wrapping the kanban columns grid, tracking individual task update/deletion states, and handling asynchronous mutations via API.
  */
 
 "use client";
@@ -13,7 +13,7 @@ import KanbanBoardHeader from "./components/KanbanBoardHeader";
 
 /**
  * Renders the responsive grid container of kanban columns, coordinating state tracking
- * for active task updates and triggering status mutation API requests.
+ * for active task updates/deletions and triggering mutation API requests.
  *
  * @param {Object} props - The component props.
  * @param {Task[]} props.tasks - The array of task items displayed across the board.
@@ -61,10 +61,39 @@ export default function KanbanBoard({ tasks }: { tasks: Task[] }) {
     });
   };
 
+  /**
+   * Deletes a specific task by sending a DELETE request to the API,
+   * managing loading states, and refreshing the router upon success.
+   *
+   * @param {string} taskId - The unique identifier of the task to delete.
+   */
+  const deleteTask = (taskId: string) => {
+    setUpdatingTaskIds((prev) => new Set(prev).add(taskId));
+
+    startTransition(async () => {
+      try {
+        const response = await fetch(`/api/tasks/${taskId}`, {
+          method: "DELETE",
+        });
+
+        if (!response.ok) throw new Error("Failed to delete task");
+        await router.refresh();
+      } catch (error) {
+        console.error("Error during task deletion:", error);
+      } finally {
+        setUpdatingTaskIds((prev) => {
+          const next = new Set(prev);
+          next.delete(taskId);
+          return next;
+        });
+      }
+    });
+  };
+
   return (
     <div className="space-y-8">
       {/* Workspace Header */}
-      <KanbanBoardHeader />
+      <KanbanBoardHeader onTaskDelete={deleteTask} />
 
       {/* Kanban Columns Grid */}
       <div className="grid grid-cols-1 md:grid-cols-2 xl:grid-cols-4 gap-6 items-start">
@@ -80,6 +109,7 @@ export default function KanbanBoard({ tasks }: { tasks: Task[] }) {
               color={col.color}
               updatingTaskIds={updatingTaskIds}
               onTaskMove={updateTaskStatus}
+              onTaskDelete={deleteTask}
             />
           );
         })}

app/(app)/dashboard/KanbanCard.tsx

@@ -23,6 +23,7 @@ export default function KanbanCard({
   task,
   isUpdating = false,
   onStatusChange,
+  onDelete,
 }: KanbanCardProps) {
   /**
    * Initiates the drag action on a task card if not currently updating, storing its ID and status payload.
@@ -88,7 +89,11 @@ export default function KanbanCard({
             creator={task.creator}
             assignees={task.assignees}
           />
-          <KanbanCardActions currentStatus={task.status} onMove={handleMove} />
+          <KanbanCardActions
+            currentStatus={task.status}
+            onMove={handleMove}
+            onDelete={() => onDelete?.(task.id)}
+          />
         </div>
       </div>
     </div>

app/(app)/dashboard/KanbanColumn.tsx

@@ -97,6 +97,7 @@ export default function KanbanColumn(props: KanbanColumnProps) {
               task={task}
               isUpdating={props.updatingTaskIds?.has(task.id)}
               onStatusChange={props.onTaskMove}
+              onDelete={props.onTaskDelete}
             />
           ))
         )}

app/(app)/dashboard/components/KanbanBoardHeader.tsx

@@ -1,16 +1,45 @@
 /**
  * @file dashboard/components/KanbanBoardHeader.tsx
- * @description Component rendering the top title header and action buttons for the dashboard view.
+ * @description Component rendering the top title header with an integrated delete drop zone that appears during drag-and-drop interactions.
  */
 
-import { Plus, Sparkles } from "lucide-react";
+"use client";
+
+import { useState, useEffect } from "react";
+import { Plus, Sparkles, Trash2 } from "lucide-react";
 
 /**
- * Renders the dashboard header section including title, subtitle, workspace indicator, and action triggers.
+ * Renders the dashboard header featuring a workspace title, subtitle, new task action button,
+ * and a dynamic drop zone for deleting tasks during drag operations.
  *
- * @returns {JSX.Element} The rendered dashboard header component.
+ * @param {Object} props - The component props.
+ * @param {(taskId: string) => void} props.onTaskDelete - Callback function invoked when a task is dropped into the delete zone.
+ * @returns {JSX.Element} The rendered kanban board header component.
  */
-export default function KanbanBoardHeader() {
+export default function KanbanBoardHeader({
+  onTaskDelete,
+}: {
+  onTaskDelete: (taskId: string) => void;
+}) {
+  const [isDragging, setIsDragging] = useState(false);
+  const [isOver, setIsOver] = useState(false);
+
+  useEffect(() => {
+    const handleDragStart = () => setIsDragging(true);
+    const handleDragEnd = () => {
+      setIsDragging(false);
+      setIsOver(false);
+    };
+
+    window.addEventListener("dragstart", handleDragStart);
+    window.addEventListener("dragend", handleDragEnd);
+
+    return () => {
+      window.removeEventListener("dragstart", handleDragStart);
+      window.removeEventListener("dragend", handleDragEnd);
+    };
+  }, []);
+
   return (
     <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-4">
       <div>
@@ -25,10 +54,38 @@ export default function KanbanBoardHeader() {
       </div>
 
       <div className="flex items-center gap-3">
-        <button className="inline-flex items-center gap-2 px-3.5 py-2.5 rounded-xl font-medium text-sm text-black hover:text-foreground bg-primary hover:bg-primary-hover active:scale-95 transition-colors duration-200 cursor-pointer">
-          <Plus size={16} />
-          New Task
-        </button>
+        {isDragging ? (
+          <div
+            onDragOver={(e) => {
+              e.preventDefault();
+              e.dataTransfer.dropEffect = "move";
+              setIsOver(true);
+            }}
+            onDragLeave={() => setIsOver(false)}
+            onDrop={(e) => {
+              e.preventDefault();
+              setIsOver(false);
+              setIsDragging(false);
+              const taskId = e.dataTransfer.getData("text/plain");
+              if (taskId) {
+                onTaskDelete(taskId);
+              }
+            }}
+            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 animate-in fade-in zoom-in-95 duration-200"
+            }`}
+          >
+            <Trash2 size={16} className={isOver ? "animate-bounce" : ""} />
+            <span>Drop to Delete</span>
+          </div>
+        ) : (
+          <button className="inline-flex items-center gap-2 px-3.5 py-2.5 rounded-xl font-medium text-sm text-black hover:text-foreground bg-primary hover:bg-primary-hover active:scale-95 transition-colors duration-200 cursor-pointer">
+            <Plus size={16} />
+            New Task
+          </button>
+        )}
       </div>
     </div>
   );

app/(app)/dashboard/components/KanbanCardActions.tsx

@@ -1,29 +1,32 @@
 /**
  * @file dashboard/components/KanbanCardActions.tsx
- * @description Client component rendering the mobile status transition dropdown for a kanban card.
+ * @description Client component rendering the mobile status transition and deletion dropdown for a kanban card.
  */
 
 "use client";
 
 import { useState, useEffect, useRef } from "react";
-import { MoreHorizontal, CornerDownRight } from "lucide-react";
+import { MoreHorizontal, CornerDownRight, Trash2 } from "lucide-react";
 import { KANBAN_COLUMNS, TaskStatus } from "@/types/tasks";
 
 /**
  * Renders a mobile-only action menu component allowing users to move a task
- * between different kanban columns via a dropdown interface.
+ * between different kanban columns or delete it entirely via a dropdown interface.
  *
  * @param {Object} props - The component props.
  * @param {TaskStatus} props.currentStatus - The current status category of the task.
  * @param {(newStatus: TaskStatus) => void} props.onMove - Callback function triggered when a new status column is selected.
+ * @param {() => void} props.onDelete - Callback function triggered when the delete action is selected.
  * @returns {JSX.Element} The rendered mobile card actions component.
  */
 export default function KanbanCardActions({
   currentStatus,
   onMove,
+  onDelete,
 }: {
   currentStatus: TaskStatus;
   onMove: (newStatus: TaskStatus) => void;
+  onDelete: () => void;
 }) {
   const [showMobileActions, setShowMobileActions] = useState(false);
   const dropdownRef = useRef<HTMLDivElement>(null);
@@ -59,6 +62,17 @@ export default function KanbanCardActions({
     setShowMobileActions(false);
   };
 
+  /**
+   * Handles clicking the delete action item to trigger task deletion.
+   *
+   * @param {React.MouseEvent} e - The mouse event object.
+   */
+  const handleDeleteClick = (e: React.MouseEvent) => {
+    e.stopPropagation();
+    onDelete();
+    setShowMobileActions(false);
+  };
+
   return (
     <div className="relative sm:hidden" ref={dropdownRef}>
       <button
@@ -99,6 +113,18 @@ export default function KanbanCardActions({
             </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>
       </div>
     </div>
   );

types/tasks.ts

@@ -46,12 +46,14 @@ export interface KanbanColumnProps extends KanbanColumnConfig {
   tasks: Task[];
   updatingTaskIds?: Set<string>;
   onTaskMove?: (taskId: string, targetStatus: TaskStatus) => void;
+  onTaskDelete?: (taskId: string) => void;
 }
 
 export interface KanbanCardProps {
   task: Task;
   isUpdating?: boolean;
   onStatusChange?: (taskId: string, newStatus: TaskStatus) => void;
+  onDelete?: (taskId: string) => void;
 }
 
 // ==========================================