Merge branch 'dev-0.2.1' into dev-0.2

# Conflicts:
#	generated/prisma/internal/class.ts
#	generated/prisma/internal/prismaNamespace.ts
#	generated/prisma/internal/prismaNamespaceBrowser.ts
#	generated/prisma/models/BoardColumn.ts
#	generated/prisma/models/Project.ts
#	generated/prisma/models/ProjectMember.ts
#	generated/prisma/models/Task.ts
#	generated/prisma/models/TaskMember.ts
#	generated/prisma/models/TaskTag.ts
#	generated/prisma/models/User.ts
#	server/routes/projects.js
#	server/routes/tasks.js
#	src/api/task.js

src/styles/globals.css

@@ -70,6 +70,35 @@ input, textarea, select { font: inherit; }
   background: var(--color-bg);
 }
 
+/* 离线标识 (0.2.1): 窗口左上角, 仅在离线/服务不可达时出现 */
+.offline-badge {
+  position: fixed;
+  top: calc(var(--safe-top) + 4px);
+  left: 6px;
+  z-index: 120;
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  padding: 2px 6px;
+  border-radius: 999px;
+  background: rgba(255, 77, 79, 0.12);
+  border: 1px solid rgba(255, 77, 79, 0.35);
+  color: #cf1322;
+  font-size: 10px;
+  line-height: 1;
+  font-weight: 600;
+  pointer-events: none;
+  user-select: none;
+}
+.offline-dot {
+  width: 6px;
+  height: 6px;
+  border-radius: 50%;
+  background: #ff4d4f;
+  box-shadow: 0 0 0 2px rgba(255, 77, 79, 0.18);
+}
+.offline-text { letter-spacing: 1px; }
+
 .app-main {
   flex: 1 1 auto;
   min-height: 0;
@@ -718,6 +747,13 @@ body.me-safe-top .app-safe-top { height: 0; }
   font-size: 10px; line-height: 1; font-weight: 600; color: #fff;
   border-radius: 4px; padding: 3px 5px; flex-shrink: 0; white-space: nowrap;
 }
+/* 任务编号 (0.2.1): `项目编号-序号`, 服务端分配 */
+.num-tag {
+  display: inline-flex; align-items: center;
+  font-size: 10px; line-height: 1; font-weight: 600;
+  color: #5b6b7c; background: #eef2f6; border-radius: 4px; padding: 3px 5px;
+  flex-shrink: 0; white-space: nowrap; font-variant-numeric: tabular-nums;
+}
 /* 项目管理: 任务类型编辑 chips */
 .kind-chip-row { display: flex; flex-wrap: wrap; gap: 8px; }
 .kind-chip {