feat(tasks): kanban board with To Do / In Progress / Done columns

- add a `status` field to tasks (backend schema/validation/service/types
  + frontend types), kept in sync with the legacy `done` flag
- migration 0017 adds the column and backfills done tasks to "done"
- rewrite the tasks page as a three-column board: per-column add buttons,
  draggable cards, and a status mover in the detail sheet

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/src/db/schema/tasks.ts

@@ -7,7 +7,7 @@ import {
   uuid,
 } from "drizzle-orm/pg-core";
 
-import type { TaskPriority } from "../../types/task.js";
+import type { TaskPriority, TaskStatus } from "../../types/task.js";
 import { organization, user } from "./auth.js";
 
 // One row per care-team to-do, scoped to a clinic (organization). Shared across
@@ -27,6 +27,9 @@ export const tasks = pgTable(
     assigneeRole: text("assignee_role"),
     due: text("due").notNull().default("No due date"),
     priority: text("priority").$type<TaskPriority>().notNull(),
+    // Board column: todo | in_progress | done. Kept in sync with `done`
+    // (done === status === "done") so the legacy toggle still works.
+    status: text("status").$type<TaskStatus>().notNull().default("todo"),
     patient: text("patient"),
     notes: text("notes"),
     done: boolean("done").notNull().default(false),

backend/src/lib/task-validation.ts

@@ -17,6 +17,7 @@ export const taskInputSchema = z.object({
   assigneeRole: z.enum(TASK_DEPARTMENTS).nullish(),
   due: z.string().trim().max(120).default("No due date"),
   priority: z.enum(["high", "medium", "low"]).default("medium"),
+  status: z.enum(["todo", "in_progress", "done"]).default("todo"),
   patient: z.string().trim().max(200).nullish(),
   notes: z.string().max(5000).nullish(),
 });

backend/src/services/tasks.ts

@@ -26,6 +26,7 @@ function toTask(row: TaskRow): Task {
     assigneeRole: row.assigneeRole,
     due: row.due,
     priority: row.priority,
+    status: row.status,
     patient: row.patient,
     notes: row.notes,
     done: row.done,
@@ -74,6 +75,9 @@ export async function createTask(
       assigneeRole: input.assigneeRole ?? null,
       due: input.due,
       priority: input.priority,
+      status: input.status,
+      // Keep the legacy `done` flag in lock-step with the board column.
+      done: input.status === "done",
       patient: input.patient ?? null,
       notes: input.notes ?? null,
       createdBy: creator.id,
@@ -100,7 +104,15 @@ export async function updateTask(
   if (patch.priority !== undefined) set.priority = patch.priority;
   if (patch.patient !== undefined) set.patient = patch.patient ?? null;
   if (patch.notes !== undefined) set.notes = patch.notes ?? null;
-  if (patch.done !== undefined) set.done = patch.done;
+  // Keep `status` and the legacy `done` flag in sync: a status patch wins and
+  // sets done; a bare done toggle maps to done/todo.
+  if (patch.status !== undefined) {
+    set.status = patch.status;
+    set.done = patch.status === "done";
+  } else if (patch.done !== undefined) {
+    set.done = patch.done;
+    set.status = patch.done ? "done" : "todo";
+  }
 
   if (Object.keys(set).length === 0) {
     const [row] = await db

backend/src/types/task.ts

@@ -2,6 +2,8 @@
 // `lib/tasks.ts` Task type. Scoped to the active clinic (a shared care-team
 // to-do board). `patient` is an optional free-text reference for context.
 export type TaskPriority = "high" | "medium" | "low";
+// Board column the task sits in. `done` mirrors `status === "done"`.
+export type TaskStatus = "todo" | "in_progress" | "done";
 
 export type Task = {
   id: string;
@@ -11,6 +13,7 @@ export type Task = {
   assigneeRole: string | null;
   due: string;
   priority: TaskPriority;
+  status: TaskStatus;
   patient: string | null;
   notes: string | null;
   done: boolean;