feat: due dates, subtasks, and task detail page (HQ-{number} URLs)

- Schema: added due_date and subtasks JSONB columns to tasks
- API: CRUD endpoints for subtasks (/tasks/:id/subtasks)
- API: due date support in create/update task
- TaskDetailPanel: due date picker with overdue/soon badges
- TaskDetailPanel: subtask checklist with progress bar
- TaskPage: full-page task view at /task/HQ-{number}
- Dashboard: task cards link to detail page, show subtask progress & due date badges
- Migration: 0001_mighty_callisto.sql

frontend/src/App.tsx

@@ -4,6 +4,7 @@ import { DashboardPage } from "./pages/DashboardPage";
 import { QueuePage } from "./pages/QueuePage";
 import { ChatPage } from "./pages/ChatPage";
 import { ProjectsPage } from "./pages/ProjectsPage";
+import { TaskPage } from "./pages/TaskPage";
 import { AdminPage } from "./components/AdminPage";
 import { LoginPage } from "./components/LoginPage";
 import { useSession } from "./lib/auth-client";
@@ -15,6 +16,7 @@ function AuthenticatedApp() {
         <Route element={<DashboardLayout />}>
           <Route path="/" element={<DashboardPage />} />
           <Route path="/queue" element={<QueuePage />} />
+          <Route path="/task/:taskRef" element={<TaskPage />} />
           <Route path="/projects" element={<ProjectsPage />} />
           <Route path="/chat" element={<ChatPage />} />
           <Route path="/admin" element={<AdminPage />} />

frontend/src/components/TaskDetailPanel.tsx

@@ -1,6 +1,6 @@
 import { useState, useEffect, useRef } from "react";
 import type { Task, TaskStatus, TaskPriority, TaskSource, Project } from "../lib/types";
-import { updateTask, fetchProjects, addProgressNote } from "../lib/api";
+import { updateTask, fetchProjects, addProgressNote, addSubtask, toggleSubtask, deleteSubtask } from "../lib/api";
 
 const priorityColors: Record<TaskPriority, string> = {
   critical: "bg-red-500 text-white",
@@ -253,7 +253,10 @@ export function TaskDetailPanel({ task, onClose, onStatusChange, onTaskUpdated,
   const [draftPriority, setDraftPriority] = useState(task.priority);
   const [draftSource, setDraftSource] = useState(task.source);
   const [draftProjectId, setDraftProjectId] = useState(task.projectId || "");
+  const [draftDueDate, setDraftDueDate] = useState(task.dueDate ? new Date(task.dueDate).toISOString().slice(0, 16) : "");
   const [projects, setProjects] = useState<Project[]>([]);
+  const [newSubtaskTitle, setNewSubtaskTitle] = useState("");
+  const [addingSubtask, setAddingSubtask] = useState(false);
 
   // Fetch projects for the selector
   useEffect(() => {
@@ -267,15 +270,18 @@ export function TaskDetailPanel({ task, onClose, onStatusChange, onTaskUpdated,
     setDraftPriority(task.priority);
     setDraftSource(task.source);
     setDraftProjectId(task.projectId || "");
-  }, [task.id, task.title, task.description, task.priority, task.source, task.projectId]);
+    setDraftDueDate(task.dueDate ? new Date(task.dueDate).toISOString().slice(0, 16) : "");
+  }, [task.id, task.title, task.description, task.priority, task.source, task.projectId, task.dueDate]);
 
   // Detect if any field has been modified
+  const currentDueDate = task.dueDate ? new Date(task.dueDate).toISOString().slice(0, 16) : "";
   const isDirty =
     draftTitle !== task.title ||
     draftDescription !== (task.description || "") ||
     draftPriority !== task.priority ||
     draftSource !== task.source ||
-    draftProjectId !== (task.projectId || "");
+    draftProjectId !== (task.projectId || "") ||
+    draftDueDate !== currentDueDate;
 
   const handleCancel = () => {
     setDraftTitle(task.title);
@@ -283,6 +289,7 @@ export function TaskDetailPanel({ task, onClose, onStatusChange, onTaskUpdated,
     setDraftPriority(task.priority);
     setDraftSource(task.source);
     setDraftProjectId(task.projectId || "");
+    setDraftDueDate(task.dueDate ? new Date(task.dueDate).toISOString().slice(0, 16) : "");
   };
 
   const handleSave = async () => {
@@ -295,6 +302,7 @@ export function TaskDetailPanel({ task, onClose, onStatusChange, onTaskUpdated,
       if (draftPriority !== task.priority) updates.priority = draftPriority;
       if (draftSource !== task.source) updates.source = draftSource;
       if (draftProjectId !== (task.projectId || "")) updates.projectId = draftProjectId || null;
+      if (draftDueDate !== currentDueDate) updates.dueDate = draftDueDate ? new Date(draftDueDate).toISOString() : null;
       await updateTask(task.id, updates, token);
       onTaskUpdated();
     } catch (e) {
@@ -462,6 +470,49 @@ export function TaskDetailPanel({ task, onClose, onStatusChange, onTaskUpdated,
             </div>
           )}
 
+          {/* Due Date */}
+          <div className="px-4 sm:px-6 py-4 border-b border-gray-100">
+            <h3 className="text-xs font-semibold text-gray-400 uppercase tracking-wider mb-2">Due Date</h3>
+            {hasToken ? (
+              <div className="flex items-center gap-2">
+                <input
+                  type="datetime-local"
+                  value={draftDueDate}
+                  onChange={(e) => setDraftDueDate(e.target.value)}
+                  className="text-sm border border-gray-200 rounded-lg px-3 py-1.5 focus:outline-none focus:ring-2 focus:ring-amber-200 bg-white"
+                />
+                {draftDueDate && (
+                  <button
+                    onClick={() => setDraftDueDate("")}
+                    className="text-xs text-gray-400 hover:text-red-500 transition"
+                    title="Clear due date"
+                  >
+                    ✕
+                  </button>
+                )}
+                {task.dueDate && (() => {
+                  const due = new Date(task.dueDate);
+                  const now = new Date();
+                  const diffMs = due.getTime() - now.getTime();
+                  const diffDays = Math.ceil(diffMs / (1000 * 60 * 60 * 24));
+                  const isOverdue = diffMs < 0;
+                  const isDueSoon = diffDays <= 2 && !isOverdue;
+                  return (
+                    <span className={`text-xs font-medium px-2 py-0.5 rounded-full ${
+                      isOverdue ? "bg-red-100 text-red-700" : isDueSoon ? "bg-amber-100 text-amber-700" : "bg-gray-100 text-gray-600"
+                    }`}>
+                      {isOverdue ? `${Math.abs(diffDays)}d overdue` : diffDays === 0 ? "Due today" : diffDays === 1 ? "Due tomorrow" : `${diffDays}d left`}
+                    </span>
+                  );
+                })()}
+              </div>
+            ) : (
+              <span className="text-sm text-gray-700">
+                {task.dueDate ? new Date(task.dueDate).toLocaleString(undefined, { month: "short", day: "numeric", year: "numeric", hour: "2-digit", minute: "2-digit" }) : <span className="text-gray-400 italic">No due date</span>}
+              </span>
+            )}
+          </div>
+
           {/* Description */}
           <div className="px-4 sm:px-6 py-4 border-b border-gray-100">
             <h3 className="text-xs font-semibold text-gray-400 uppercase tracking-wider mb-2">Description</h3>
@@ -509,6 +560,128 @@ export function TaskDetailPanel({ task, onClose, onStatusChange, onTaskUpdated,
             </div>
           </div>
 
+          {/* Subtasks */}
+          <div className="px-4 sm:px-6 py-4 border-b border-gray-100">
+            <h3 className="text-xs font-semibold text-gray-400 uppercase tracking-wider mb-3">
+              Subtasks {task.subtasks?.length > 0 && (
+                <span className="text-gray-300 ml-1">
+                  ({task.subtasks.filter(s => s.completed).length}/{task.subtasks.length})
+                </span>
+              )}
+            </h3>
+
+            {/* Subtask progress bar */}
+            {task.subtasks?.length > 0 && (
+              <div className="mb-3">
+                <div className="w-full bg-gray-200 rounded-full h-1.5">
+                  <div
+                    className="bg-green-500 h-1.5 rounded-full transition-all duration-300"
+                    style={{ width: `${(task.subtasks.filter(s => s.completed).length / task.subtasks.length) * 100}%` }}
+                  />
+                </div>
+              </div>
+            )}
+
+            {/* Subtask list */}
+            {task.subtasks?.length > 0 && (
+              <div className="space-y-1 mb-3">
+                {task.subtasks.map((subtask) => (
+                  <div key={subtask.id} className="flex items-center gap-2 group py-1">
+                    <button
+                      onClick={async () => {
+                        try {
+                          await toggleSubtask(task.id, subtask.id, !subtask.completed);
+                          onTaskUpdated();
+                        } catch (e) {
+                          console.error("Failed to toggle subtask:", e);
+                        }
+                      }}
+                      className={`w-5 h-5 rounded border-2 flex items-center justify-center shrink-0 transition ${
+                        subtask.completed
+                          ? "bg-green-500 border-green-500 text-white"
+                          : "border-gray-300 hover:border-amber-400"
+                      }`}
+                    >
+                      {subtask.completed && (
+                        <svg className="w-3 h-3" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={3} d="M5 13l4 4L19 7" />
+                        </svg>
+                      )}
+                    </button>
+                    <span className={`text-sm flex-1 ${subtask.completed ? "line-through text-gray-400" : "text-gray-700"}`}>
+                      {subtask.title}
+                    </span>
+                    {hasToken && (
+                      <button
+                        onClick={async () => {
+                          try {
+                            await deleteSubtask(task.id, subtask.id);
+                            onTaskUpdated();
+                          } catch (e) {
+                            console.error("Failed to delete subtask:", e);
+                          }
+                        }}
+                        className="opacity-0 group-hover:opacity-100 text-gray-300 hover:text-red-400 transition p-0.5"
+                        title="Remove subtask"
+                      >
+                        <svg className="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
+                        </svg>
+                      </button>
+                    )}
+                  </div>
+                ))}
+              </div>
+            )}
+
+            {/* Add subtask input */}
+            {hasToken && (
+              <div className="flex gap-2">
+                <input
+                  type="text"
+                  value={newSubtaskTitle}
+                  onChange={(e) => setNewSubtaskTitle(e.target.value)}
+                  placeholder="Add a subtask..."
+                  className="flex-1 text-sm border border-gray-200 rounded-lg px-3 py-1.5 focus:outline-none focus:ring-2 focus:ring-amber-200 focus:border-amber-300"
+                  onKeyDown={async (e) => {
+                    if (e.key === "Enter" && newSubtaskTitle.trim()) {
+                      setAddingSubtask(true);
+                      try {
+                        await addSubtask(task.id, newSubtaskTitle.trim());
+                        setNewSubtaskTitle("");
+                        onTaskUpdated();
+                      } catch (err) {
+                        console.error("Failed to add subtask:", err);
+                      } finally {
+                        setAddingSubtask(false);
+                      }
+                    }
+                  }}
+                  disabled={addingSubtask}
+                />
+                <button
+                  onClick={async () => {
+                    if (!newSubtaskTitle.trim()) return;
+                    setAddingSubtask(true);
+                    try {
+                      await addSubtask(task.id, newSubtaskTitle.trim());
+                      setNewSubtaskTitle("");
+                      onTaskUpdated();
+                    } catch (err) {
+                      console.error("Failed to add subtask:", err);
+                    } finally {
+                      setAddingSubtask(false);
+                    }
+                  }}
+                  disabled={!newSubtaskTitle.trim() || addingSubtask}
+                  className="px-3 py-1.5 bg-amber-500 text-white text-sm rounded-lg font-medium hover:bg-amber-600 transition disabled:opacity-50 disabled:cursor-not-allowed shrink-0"
+                >
+                  {addingSubtask ? "..." : "+"}
+                </button>
+              </div>
+            )}
+          </div>
+
           {/* Progress Notes */}
           <div className="px-4 sm:px-6 py-4">
             <h3 className="text-xs font-semibold text-gray-400 uppercase tracking-wider mb-3">

frontend/src/lib/api.ts

@@ -115,6 +115,38 @@ export async function deleteProject(id: string): Promise<void> {
   if (!res.ok) throw new Error("Failed to delete project");
 }
 
+// Subtasks
+export async function addSubtask(taskId: string, title: string): Promise<Task> {
+  const res = await fetch(`${BASE}/${taskId}/subtasks`, {
+    method: "POST",
+    credentials: "include",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify({ title }),
+  });
+  if (!res.ok) throw new Error("Failed to add subtask");
+  return res.json();
+}
+
+export async function toggleSubtask(taskId: string, subtaskId: string, completed: boolean): Promise<Task> {
+  const res = await fetch(`${BASE}/${taskId}/subtasks/${subtaskId}`, {
+    method: "PATCH",
+    credentials: "include",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify({ completed }),
+  });
+  if (!res.ok) throw new Error("Failed to toggle subtask");
+  return res.json();
+}
+
+export async function deleteSubtask(taskId: string, subtaskId: string): Promise<Task> {
+  const res = await fetch(`${BASE}/${taskId}/subtasks/${subtaskId}`, {
+    method: "DELETE",
+    credentials: "include",
+  });
+  if (!res.ok) throw new Error("Failed to delete subtask");
+  return res.json();
+}
+
 // Progress Notes
 export async function addProgressNote(taskId: string, note: string): Promise<Task> {
   const res = await fetch(`${BASE}/${taskId}/notes`, {

frontend/src/lib/types.ts

@@ -7,6 +7,14 @@ export interface ProgressNote {
   note: string;
 }
 
+export interface Subtask {
+  id: string;
+  title: string;
+  completed: boolean;
+  completedAt?: string;
+  createdAt: string;
+}
+
 export interface ProjectLink {
   label: string;
   url: string;
@@ -36,7 +44,11 @@ export interface Task {
   status: TaskStatus;
   priority: TaskPriority;
   position: number;
+  assigneeId: string | null;
+  assigneeName: string | null;
   projectId: string | null;
+  dueDate: string | null;
+  subtasks: Subtask[];
   progressNotes: ProgressNote[];
   createdAt: string;
   updatedAt: string;

frontend/src/pages/DashboardPage.tsx

@@ -137,7 +137,7 @@ export function DashboardPage() {
               ) : (
                 <div className="space-y-3">
                   {activeTasks.map((task) => (
-                    <Link to="/queue" key={task.id} className="block">
+                    <Link to={`/task/HQ-${task.taskNumber}`} key={task.id} className="block">
                       <div className="rounded-lg border border-amber-200 bg-amber-50 p-3 hover:bg-amber-100 transition">
                         <div className="flex items-center gap-2 mb-1">
                           <span className="relative flex h-2 w-2">
@@ -146,8 +146,27 @@ export function DashboardPage() {
                           </span>
                           <span className="text-xs font-bold text-amber-700 font-mono">HQ-{task.taskNumber}</span>
                           <span className="text-xs text-amber-600 capitalize px-1.5 py-0.5 bg-amber-200/50 rounded-full">{task.priority}</span>
+                          {task.dueDate && (() => {
+                            const due = new Date(task.dueDate);
+                            const diffMs = due.getTime() - Date.now();
+                            const diffDays = Math.ceil(diffMs / (1000 * 60 * 60 * 24));
+                            const isOverdue = diffMs < 0;
+                            return isOverdue || diffDays <= 2 ? (
+                              <span className={`text-xs px-1.5 py-0.5 rounded-full ${isOverdue ? "bg-red-200 text-red-700" : "bg-amber-200 text-amber-700"}`}>
+                                📅 {isOverdue ? "overdue" : diffDays === 0 ? "today" : diffDays === 1 ? "tomorrow" : `${diffDays}d`}
+                              </span>
+                            ) : null;
+                          })()}
                         </div>
                         <h3 className="font-medium text-sm text-amber-900">{task.title}</h3>
+                        {task.subtasks?.length > 0 && (
+                          <div className="mt-1.5 flex items-center gap-2">
+                            <div className="flex-1 bg-amber-200/50 rounded-full h-1">
+                              <div className="bg-green-500 h-1 rounded-full" style={{ width: `${(task.subtasks.filter(s => s.completed).length / task.subtasks.length) * 100}%` }} />
+                            </div>
+                            <span className="text-xs text-amber-600">{task.subtasks.filter(s => s.completed).length}/{task.subtasks.length}</span>
+                          </div>
+                        )}
                         {task.progressNotes?.length > 0 && (
                           <p className="text-xs text-amber-700 mt-1 line-clamp-2 opacity-70">
                             Latest: {task.progressNotes[task.progressNotes.length - 1].note}

frontend/src/pages/TaskPage.tsx

@@ -0,0 +1,493 @@
+import { useState, useEffect, useCallback } from "react";
+import { useParams, Link } from "react-router-dom";
+import type { Task, TaskStatus, Project } from "../lib/types";
+import { updateTask, fetchProjects, addProgressNote, addSubtask, toggleSubtask, deleteSubtask } from "../lib/api";
+
+const priorityColors: Record<string, string> = {
+  critical: "bg-red-500 text-white",
+  high: "bg-orange-500 text-white",
+  medium: "bg-blue-500 text-white",
+  low: "bg-gray-400 text-white",
+};
+
+const statusColors: Record<string, string> = {
+  active: "bg-amber-100 text-amber-800 border-amber-300",
+  queued: "bg-blue-100 text-blue-800 border-blue-300",
+  blocked: "bg-red-100 text-red-800 border-red-300",
+  completed: "bg-green-100 text-green-800 border-green-300",
+  cancelled: "bg-gray-100 text-gray-600 border-gray-300",
+};
+
+const statusIcons: Record<string, string> = {
+  active: "⚡",
+  queued: "📋",
+  blocked: "🚫",
+  completed: "✅",
+  cancelled: "❌",
+};
+
+const statusActions: Record<string, { label: string; next: TaskStatus; color: string }[]> = {
+  active: [
+    { label: "⏸ Pause", next: "queued", color: "bg-blue-50 text-blue-700 border-blue-200 hover:bg-blue-100" },
+    { label: "🚫 Block", next: "blocked", color: "bg-red-50 text-red-700 border-red-200 hover:bg-red-100" },
+    { label: "✅ Complete", next: "completed", color: "bg-green-50 text-green-700 border-green-200 hover:bg-green-100" },
+  ],
+  queued: [
+    { label: "▶ Activate", next: "active", color: "bg-amber-50 text-amber-700 border-amber-200 hover:bg-amber-100" },
+    { label: "🚫 Block", next: "blocked", color: "bg-red-50 text-red-700 border-red-200 hover:bg-red-100" },
+  ],
+  blocked: [
+    { label: "▶ Activate", next: "active", color: "bg-amber-50 text-amber-700 border-amber-200 hover:bg-amber-100" },
+    { label: "📋 Queue", next: "queued", color: "bg-blue-50 text-blue-700 border-blue-200 hover:bg-blue-100" },
+  ],
+  completed: [{ label: "🔄 Requeue", next: "queued", color: "bg-blue-50 text-blue-700 border-blue-200 hover:bg-blue-100" }],
+  cancelled: [{ label: "🔄 Requeue", next: "queued", color: "bg-blue-50 text-blue-700 border-blue-200 hover:bg-blue-100" }],
+};
+
+function formatDate(dateStr: string): string {
+  return new Date(dateStr).toLocaleString(undefined, {
+    month: "short", day: "numeric", year: "numeric",
+    hour: "2-digit", minute: "2-digit",
+  });
+}
+
+function timeAgo(dateStr: string): string {
+  const seconds = Math.floor((Date.now() - new Date(dateStr).getTime()) / 1000);
+  if (seconds < 60) return "just now";
+  const minutes = Math.floor(seconds / 60);
+  if (minutes < 60) return `${minutes}m ago`;
+  const hours = Math.floor(minutes / 60);
+  if (hours < 24) return `${hours}h ago`;
+  const days = Math.floor(hours / 24);
+  return `${days}d ago`;
+}
+
+export function TaskPage() {
+  const { taskRef } = useParams<{ taskRef: string }>();
+  const [task, setTask] = useState<Task | null>(null);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<string | null>(null);
+  const [projects, setProjects] = useState<Project[]>([]);
+  const [noteText, setNoteText] = useState("");
+  const [addingNote, setAddingNote] = useState(false);
+  const [newSubtaskTitle, setNewSubtaskTitle] = useState("");
+  const [addingSubtask, setAddingSubtask] = useState(false);
+  const [saving, setSaving] = useState(false);
+
+  const fetchTask = useCallback(async () => {
+    if (!taskRef) return;
+    try {
+      const res = await fetch(`/api/tasks/${taskRef}`, { credentials: "include" });
+      if (!res.ok) throw new Error(res.status === 404 ? "Task not found" : "Failed to load task");
+      const data = await res.json();
+      setTask(data);
+      setError(null);
+    } catch (e: any) {
+      setError(e.message);
+    } finally {
+      setLoading(false);
+    }
+  }, [taskRef]);
+
+  useEffect(() => {
+    fetchTask();
+    fetchProjects().then(setProjects).catch(() => {});
+  }, [fetchTask]);
+
+  // Auto-refresh every 15s
+  useEffect(() => {
+    const interval = setInterval(fetchTask, 15000);
+    return () => clearInterval(interval);
+  }, [fetchTask]);
+
+  const handleStatusChange = async (status: TaskStatus) => {
+    if (!task) return;
+    setSaving(true);
+    try {
+      await updateTask(task.id, { status });
+      fetchTask();
+    } catch (e) {
+      console.error("Failed to update status:", e);
+    } finally {
+      setSaving(false);
+    }
+  };
+
+  if (loading) {
+    return (
+      <div className="min-h-screen flex items-center justify-center text-gray-400">
+        Loading task...
+      </div>
+    );
+  }
+
+  if (error || !task) {
+    return (
+      <div className="min-h-screen flex items-center justify-center">
+        <div className="text-center">
+          <span className="text-4xl block mb-3">😕</span>
+          <p className="text-gray-500 mb-4">{error || "Task not found"}</p>
+          <Link to="/queue" className="text-amber-600 hover:text-amber-700 font-medium text-sm">
+            ← Back to Queue
+          </Link>
+        </div>
+      </div>
+    );
+  }
+
+  const isActive = task.status === "active";
+  const actions = statusActions[task.status] || [];
+  const project = projects.find((p) => p.id === task.projectId);
+  const subtaskProgress = task.subtasks?.length > 0
+    ? Math.round((task.subtasks.filter(s => s.completed).length / task.subtasks.length) * 100)
+    : 0;
+
+  return (
+    <div className="min-h-screen">
+      {/* Header */}
+      <header className={`sticky top-14 md:top-0 z-30 border-b ${isActive ? "bg-gradient-to-r from-amber-50 to-orange-50 border-amber-200" : "bg-white border-gray-200"}`}>
+        <div className="max-w-4xl mx-auto px-4 sm:px-6 py-4">
+          <div className="flex items-center gap-2 mb-2">
+            <Link to="/queue" className="text-sm text-gray-400 hover:text-gray-600 transition">
+              ← Queue
+            </Link>
+            <span className="text-gray-300">/</span>
+            <span className="text-xs font-bold text-amber-700 bg-amber-100 px-2 py-0.5 rounded font-mono">
+              HQ-{task.taskNumber}
+            </span>
+          </div>
+          <div className="flex items-start justify-between gap-4">
+            <div className="flex-1 min-w-0">
+              <div className="flex items-center gap-2 mb-1 flex-wrap">
+                {isActive && (
+                  <span className="relative flex h-3 w-3">
+                    <span className="animate-ping absolute inline-flex h-full w-full rounded-full bg-amber-400 opacity-75"></span>
+                    <span className="relative inline-flex rounded-full h-3 w-3 bg-amber-500"></span>
+                  </span>
+                )}
+                <span className={`text-xs px-2.5 py-1 rounded-full font-semibold border ${statusColors[task.status]}`}>
+                  {statusIcons[task.status]} {task.status.toUpperCase()}
+                </span>
+                <span className={`text-xs px-2 py-0.5 rounded-full font-medium ${priorityColors[task.priority]}`}>
+                  {task.priority}
+                </span>
+                {project && (
+                  <span className="text-xs text-gray-500 bg-gray-100 px-2 py-0.5 rounded">
+                    📁 {project.name}
+                  </span>
+                )}
+              </div>
+              <h1 className="text-xl font-bold text-gray-900">{task.title}</h1>
+            </div>
+            {/* Status Actions */}
+            <div className="flex gap-2 shrink-0">
+              {actions.map((action) => (
+                <button
+                  key={action.next}
+                  onClick={() => handleStatusChange(action.next)}
+                  disabled={saving}
+                  className={`text-sm px-3 py-1.5 rounded-lg border font-medium transition ${action.color} disabled:opacity-50`}
+                >
+                  {action.label}
+                </button>
+              ))}
+            </div>
+          </div>
+          {/* Due date badge */}
+          {task.dueDate && (() => {
+            const due = new Date(task.dueDate);
+            const now = new Date();
+            const diffMs = due.getTime() - now.getTime();
+            const diffDays = Math.ceil(diffMs / (1000 * 60 * 60 * 24));
+            const isOverdue = diffMs < 0;
+            const isDueSoon = diffDays <= 2 && !isOverdue;
+            return (
+              <div className="mt-2 flex items-center gap-2">
+                <span className="text-xs text-gray-500">📅 Due:</span>
+                <span className={`text-xs font-medium px-2 py-0.5 rounded-full ${
+                  isOverdue ? "bg-red-100 text-red-700" : isDueSoon ? "bg-amber-100 text-amber-700" : "bg-gray-100 text-gray-600"
+                }`}>
+                  {formatDate(task.dueDate)} ({isOverdue ? `${Math.abs(diffDays)}d overdue` : diffDays === 0 ? "today" : diffDays === 1 ? "tomorrow" : `${diffDays}d left`})
+                </span>
+              </div>
+            );
+          })()}
+        </div>
+      </header>
+
+      <div className="max-w-4xl mx-auto px-4 sm:px-6 py-6">
+        <div className="grid grid-cols-1 lg:grid-cols-3 gap-6">
+          {/* Main content */}
+          <div className="lg:col-span-2 space-y-6">
+            {/* Description */}
+            <div className="bg-white rounded-xl border border-gray-200 shadow-sm p-5">
+              <h2 className="text-sm font-semibold text-gray-400 uppercase tracking-wider mb-3">Description</h2>
+              <p className="text-sm text-gray-700 leading-relaxed whitespace-pre-wrap">
+                {task.description || <span className="text-gray-400 italic">No description</span>}
+              </p>
+            </div>
+
+            {/* Subtasks */}
+            <div className="bg-white rounded-xl border border-gray-200 shadow-sm p-5">
+              <div className="flex items-center justify-between mb-3">
+                <h2 className="text-sm font-semibold text-gray-400 uppercase tracking-wider">
+                  Subtasks {task.subtasks?.length > 0 && (
+                    <span className="text-gray-300 ml-1">({task.subtasks.filter(s => s.completed).length}/{task.subtasks.length})</span>
+                  )}
+                </h2>
+                {task.subtasks?.length > 0 && (
+                  <span className="text-xs text-gray-400">{subtaskProgress}%</span>
+                )}
+              </div>
+
+              {/* Progress bar */}
+              {task.subtasks?.length > 0 && (
+                <div className="mb-4">
+                  <div className="w-full bg-gray-200 rounded-full h-2">
+                    <div
+                      className="bg-green-500 h-2 rounded-full transition-all duration-300"
+                      style={{ width: `${subtaskProgress}%` }}
+                    />
+                  </div>
+                </div>
+              )}
+
+              {/* Subtask items */}
+              {task.subtasks?.length > 0 && (
+                <div className="space-y-1 mb-4">
+                  {task.subtasks.map((subtask) => (
+                    <div key={subtask.id} className="flex items-center gap-3 group py-1.5 px-2 rounded-lg hover:bg-gray-50 transition">
+                      <button
+                        onClick={async () => {
+                          try {
+                            await toggleSubtask(task.id, subtask.id, !subtask.completed);
+                            fetchTask();
+                          } catch (e) {
+                            console.error("Failed to toggle subtask:", e);
+                          }
+                        }}
+                        className={`w-5 h-5 rounded border-2 flex items-center justify-center shrink-0 transition ${
+                          subtask.completed
+                            ? "bg-green-500 border-green-500 text-white"
+                            : "border-gray-300 hover:border-amber-400"
+                        }`}
+                      >
+                        {subtask.completed && (
+                          <svg className="w-3 h-3" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={3} d="M5 13l4 4L19 7" />
+                          </svg>
+                        )}
+                      </button>
+                      <span className={`text-sm flex-1 ${subtask.completed ? "line-through text-gray-400" : "text-gray-700"}`}>
+                        {subtask.title}
+                      </span>
+                      <button
+                        onClick={async () => {
+                          try {
+                            await deleteSubtask(task.id, subtask.id);
+                            fetchTask();
+                          } catch (e) {
+                            console.error("Failed to delete subtask:", e);
+                          }
+                        }}
+                        className="opacity-0 group-hover:opacity-100 text-gray-300 hover:text-red-400 transition p-0.5"
+                      >
+                        <svg className="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
+                        </svg>
+                      </button>
+                    </div>
+                  ))}
+                </div>
+              )}
+
+              {/* Add subtask */}
+              <div className="flex gap-2">
+                <input
+                  type="text"
+                  value={newSubtaskTitle}
+                  onChange={(e) => setNewSubtaskTitle(e.target.value)}
+                  placeholder="Add a subtask..."
+                  className="flex-1 text-sm border border-gray-200 rounded-lg px-3 py-2 focus:outline-none focus:ring-2 focus:ring-amber-200 focus:border-amber-300"
+                  onKeyDown={async (e) => {
+                    if (e.key === "Enter" && newSubtaskTitle.trim()) {
+                      setAddingSubtask(true);
+                      try {
+                        await addSubtask(task.id, newSubtaskTitle.trim());
+                        setNewSubtaskTitle("");
+                        fetchTask();
+                      } catch (err) {
+                        console.error("Failed to add subtask:", err);
+                      } finally {
+                        setAddingSubtask(false);
+                      }
+                    }
+                  }}
+                  disabled={addingSubtask}
+                />
+                <button
+                  onClick={async () => {
+                    if (!newSubtaskTitle.trim()) return;
+                    setAddingSubtask(true);
+                    try {
+                      await addSubtask(task.id, newSubtaskTitle.trim());
+                      setNewSubtaskTitle("");
+                      fetchTask();
+                    } catch (err) {
+                      console.error("Failed to add subtask:", err);
+                    } finally {
+                      setAddingSubtask(false);
+                    }
+                  }}
+                  disabled={!newSubtaskTitle.trim() || addingSubtask}
+                  className="px-4 py-2 bg-amber-500 text-white text-sm rounded-lg font-medium hover:bg-amber-600 transition disabled:opacity-50 disabled:cursor-not-allowed shrink-0"
+                >
+                  {addingSubtask ? "..." : "+ Add"}
+                </button>
+              </div>
+            </div>
+
+            {/* Progress Notes */}
+            <div className="bg-white rounded-xl border border-gray-200 shadow-sm p-5">
+              <h2 className="text-sm font-semibold text-gray-400 uppercase tracking-wider mb-3">
+                Progress Notes {task.progressNotes?.length > 0 && (
+                  <span className="text-gray-300 ml-1">({task.progressNotes.length})</span>
+                )}
+              </h2>
+
+              {/* Add note */}
+              <div className="mb-4">
+                <div className="flex gap-2">
+                  <textarea
+                    value={noteText}
+                    onChange={(e) => setNoteText(e.target.value)}
+                    placeholder="Add a progress note..."
+                    rows={2}
+                    className="flex-1 text-sm border border-gray-200 rounded-lg px-3 py-2 focus:outline-none focus:ring-2 focus:ring-amber-200 focus:border-amber-300 resize-y min-h-[40px] max-h-32"
+                    onKeyDown={(e) => {
+                      if (e.key === "Enter" && (e.metaKey || e.ctrlKey)) {
+                        e.preventDefault();
+                        if (noteText.trim()) {
+                          setAddingNote(true);
+                          addProgressNote(task.id, noteText.trim())
+                            .then(() => { setNoteText(""); fetchTask(); })
+                            .catch((err) => console.error("Failed to add note:", err))
+                            .finally(() => setAddingNote(false));
+                        }
+                      }
+                    }}
+                  />
+                  <button
+                    onClick={() => {
+                      if (!noteText.trim()) return;
+                      setAddingNote(true);
+                      addProgressNote(task.id, noteText.trim())
+                        .then(() => { setNoteText(""); fetchTask(); })
+                        .catch((err) => console.error("Failed to add note:", err))
+                        .finally(() => setAddingNote(false));
+                    }}
+                    disabled={!noteText.trim() || addingNote}
+                    className="self-end px-4 py-2 bg-amber-500 text-white text-sm rounded-lg font-medium hover:bg-amber-600 transition disabled:opacity-50 disabled:cursor-not-allowed shrink-0"
+                  >
+                    {addingNote ? "..." : "Add"}
+                  </button>
+                </div>
+                <p className="text-[10px] text-gray-400 mt-1">⌘+Enter to submit</p>
+              </div>
+
+              {/* Notes list */}
+              {!task.progressNotes || task.progressNotes.length === 0 ? (
+                <div className="text-sm text-gray-400 italic py-6 text-center border-2 border-dashed border-gray-100 rounded-lg">
+                  No progress notes yet
+                </div>
+              ) : (
+                <div className="space-y-0">
+                  {task.progressNotes
+                    .slice()
+                    .reverse()
+                    .map((note, i) => (
+                      <div key={i} className="relative pl-6 pb-4 last:pb-0 group">
+                        {i < task.progressNotes.length - 1 && (
+                          <div className="absolute left-[9px] top-3 bottom-0 w-0.5 bg-gray-200 group-last:hidden" />
+                        )}
+                        <div className={`absolute left-0 top-1 w-[18px] h-[18px] rounded-full border-2 flex items-center justify-center ${
+                          i === 0 && isActive ? "border-amber-400 bg-amber-50" : "border-gray-300 bg-white"
+                        }`}>
+                          <div className={`w-2 h-2 rounded-full ${i === 0 && isActive ? "bg-amber-500" : "bg-gray-300"}`} />
+                        </div>
+                        <div>
+                          <p className="text-sm text-gray-700 leading-relaxed">{note.note}</p>
+                          <p className="text-xs text-gray-400 mt-0.5">{formatDate(note.timestamp)} · {timeAgo(note.timestamp)}</p>
+                        </div>
+                      </div>
+                    ))}
+                </div>
+              )}
+            </div>
+          </div>
+
+          {/* Sidebar */}
+          <div className="space-y-4">
+            {/* Meta */}
+            <div className="bg-white rounded-xl border border-gray-200 shadow-sm p-4">
+              <h3 className="text-xs font-semibold text-gray-400 uppercase tracking-wider mb-3">Details</h3>
+              <div className="space-y-3 text-sm">
+                <div className="flex justify-between">
+                  <span className="text-gray-500">Source</span>
+                  <span className="text-gray-700 font-medium capitalize">{task.source}</span>
+                </div>
+                {task.assigneeName && (
+                  <div className="flex justify-between">
+                    <span className="text-gray-500">Assignee</span>
+                    <span className="text-gray-700 font-medium">{task.assigneeName}</span>
+                  </div>
+                )}
+                {project && (
+                  <div className="flex justify-between">
+                    <span className="text-gray-500">Project</span>
+                    <span className="text-gray-700 font-medium">{project.name}</span>
+                  </div>
+                )}
+                <div className="flex justify-between">
+                  <span className="text-gray-500">Created</span>
+                  <span className="text-gray-700 text-xs">{timeAgo(task.createdAt)}</span>
+                </div>
+                {task.updatedAt !== task.createdAt && (
+                  <div className="flex justify-between">
+                    <span className="text-gray-500">Updated</span>
+                    <span className="text-gray-700 text-xs">{timeAgo(task.updatedAt)}</span>
+                  </div>
+                )}
+                {task.completedAt && (
+                  <div className="flex justify-between">
+                    <span className="text-gray-500">Completed</span>
+                    <span className="text-gray-700 text-xs">{timeAgo(task.completedAt)}</span>
+                  </div>
+                )}
+              </div>
+            </div>
+
+            {/* Quick link */}
+            <div className="bg-white rounded-xl border border-gray-200 shadow-sm p-4">
+              <h3 className="text-xs font-semibold text-gray-400 uppercase tracking-wider mb-2">Share</h3>
+              <div className="flex items-center gap-2">
+                <code className="text-xs text-gray-500 font-mono bg-gray-50 px-2 py-1 rounded flex-1 truncate">
+                  /task/HQ-{task.taskNumber}
+                </code>
+                <button
+                  onClick={() => {
+                    const url = `${window.location.origin}/task/HQ-${task.taskNumber}`;
+                    navigator.clipboard.writeText(url);
+                  }}
+                  className="text-xs px-2 py-1 bg-gray-100 rounded hover:bg-gray-200 transition"
+                >
+                  📋
+                </button>
+              </div>
+            </div>
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+}