diff --git a/apps/web/src/app/(authenticated)/files/page.tsx b/apps/web/src/app/(authenticated)/files/page.tsx
index ec31624..75dae38 100644
--- a/apps/web/src/app/(authenticated)/files/page.tsx
+++ b/apps/web/src/app/(authenticated)/files/page.tsx
@@ -26,11 +26,7 @@ import {
   DialogFooter,
 } from "@/components/ui/dialog";
 import { fetchEntries, createEntry, deleteEntry, fetchTags } from "@/lib/api/knowledge";
-import type {
-  EntriesResponse,
-  CreateEntryData,
-  EntryFilters,
-} from "@/lib/api/knowledge";
+import type { EntriesResponse, CreateEntryData, EntryFilters } from "@/lib/api/knowledge";
 
 /* ---------------------------------------------------------------------------
    Helpers
@@ -439,7 +435,7 @@ function CreateEntryDialog({
         .then((tags) => {
           setAvailableTags(tags);
         })
-        .catch((err) => {
+        .catch((err: unknown) => {
           console.error("Failed to load tags:", err);
         });
     }
@@ -730,7 +726,9 @@ function CreateEntryDialog({
                   }}
                   onBlur={() => {
                     // Delay to allow click on suggestion
-                    setTimeout(() => setShowSuggestions(false), 150);
+                    setTimeout(() => {
+                      setShowSuggestions(false);
+                    }, 150);
                   }}
                   onFocus={() => {
                     if (tagInput.length > 0) setShowSuggestions(true);
diff --git a/apps/web/src/app/(authenticated)/kanban/page.test.tsx b/apps/web/src/app/(authenticated)/kanban/page.test.tsx
new file mode 100644
index 0000000..9b98cc3
--- /dev/null
+++ b/apps/web/src/app/(authenticated)/kanban/page.test.tsx
@@ -0,0 +1,188 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { render, screen, waitFor } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import type { Task } from "@mosaic/shared";
+import { TaskPriority, TaskStatus } from "@mosaic/shared";
+import KanbanPage from "./page";
+
+const mockReplace = vi.fn();
+let mockSearchParams = new URLSearchParams();
+
+vi.mock("next/navigation", () => ({
+  useRouter: (): { replace: typeof mockReplace } => ({ replace: mockReplace }),
+  useSearchParams: (): URLSearchParams => mockSearchParams,
+}));
+
+vi.mock("@hello-pangea/dnd", () => ({
+  DragDropContext: ({ children }: { children: React.ReactNode }): React.JSX.Element => (
+    <div data-testid="mock-dnd-context">{children}</div>
+  ),
+  Droppable: ({
+    children,
+    droppableId,
+  }: {
+    children: (provided: {
+      innerRef: (el: HTMLElement | null) => void;
+      droppableProps: Record<string, never>;
+      placeholder: React.ReactNode;
+    }) => React.ReactNode;
+    droppableId: string;
+  }): React.JSX.Element => (
+    <div data-testid={`mock-droppable-${droppableId}`}>
+      {children({
+        innerRef: () => {
+          /* noop */
+        },
+        droppableProps: {},
+        placeholder: null,
+      })}
+    </div>
+  ),
+  Draggable: ({
+    children,
+    draggableId,
+  }: {
+    children: (
+      provided: {
+        innerRef: (el: HTMLElement | null) => void;
+        draggableProps: { style: Record<string, string> };
+        dragHandleProps: Record<string, string>;
+      },
+      snapshot: { isDragging: boolean }
+    ) => React.ReactNode;
+    draggableId: string;
+    index: number;
+  }): React.JSX.Element => (
+    <div data-testid={`mock-draggable-${draggableId}`}>
+      {children(
+        {
+          innerRef: () => {
+            /* noop */
+          },
+          draggableProps: { style: {} },
+          dragHandleProps: {},
+        },
+        { isDragging: false }
+      )}
+    </div>
+  ),
+}));
+
+vi.mock("@/components/ui/MosaicSpinner", () => ({
+  MosaicSpinner: ({ label }: { label?: string }): React.JSX.Element => (
+    <div data-testid="mosaic-spinner">{label ?? "Loading..."}</div>
+  ),
+}));
+
+const mockUseWorkspaceId = vi.fn<() => string | null>();
+vi.mock("@/lib/hooks", () => ({
+  useWorkspaceId: (): string | null => mockUseWorkspaceId(),
+}));
+
+const mockFetchTasks = vi.fn<() => Promise<Task[]>>();
+const mockUpdateTask = vi.fn<() => Promise<unknown>>();
+const mockCreateTask = vi.fn<() => Promise<Task>>();
+vi.mock("@/lib/api/tasks", () => ({
+  fetchTasks: (...args: unknown[]): Promise<Task[]> => mockFetchTasks(...(args as [])),
+  updateTask: (...args: unknown[]): Promise<unknown> => mockUpdateTask(...(args as [])),
+  createTask: (...args: unknown[]): Promise<Task> => mockCreateTask(...(args as [])),
+}));
+
+const mockFetchProjects = vi.fn<() => Promise<unknown[]>>();
+vi.mock("@/lib/api/projects", () => ({
+  fetchProjects: (...args: unknown[]): Promise<unknown[]> => mockFetchProjects(...(args as [])),
+}));
+
+const createdTask: Task = {
+  id: "task-new-1",
+  title: "Ship Kanban add task flow",
+  description: null,
+  status: TaskStatus.NOT_STARTED,
+  priority: TaskPriority.MEDIUM,
+  dueDate: null,
+  creatorId: "user-1",
+  assigneeId: null,
+  workspaceId: "ws-1",
+  projectId: "project-42",
+  parentId: null,
+  sortOrder: 0,
+  metadata: {},
+  completedAt: null,
+  createdAt: new Date("2026-03-01"),
+  updatedAt: new Date("2026-03-01"),
+};
+
+describe("KanbanPage add task flow", (): void => {
+  beforeEach((): void => {
+    vi.clearAllMocks();
+    mockSearchParams = new URLSearchParams("project=project-42");
+    mockUseWorkspaceId.mockReturnValue("ws-1");
+    mockFetchTasks.mockResolvedValue([]);
+    mockFetchProjects.mockResolvedValue([]);
+    mockCreateTask.mockResolvedValue(createdTask);
+  });
+
+  it("opens add-task form in a column and creates a task via API", async (): Promise<void> => {
+    const user = userEvent.setup();
+
+    render(<KanbanPage />);
+
+    await waitFor((): void => {
+      expect(screen.getByText("Kanban Board")).toBeInTheDocument();
+    });
+
+    // Click the "+ Add task" button in the To Do column
+    const addTaskButtons = screen.getAllByRole("button", { name: /\+ Add task/i });
+    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+    await user.click(addTaskButtons[0]!); // First column is "To Do"
+
+    // Type in the title input
+    const titleInput = screen.getByPlaceholderText("Task title...");
+    await user.type(titleInput, createdTask.title);
+
+    // Click the Add button
+    await user.click(screen.getByRole("button", { name: /✓ Add/i }));
+
+    await waitFor((): void => {
+      expect(mockCreateTask).toHaveBeenCalledWith(
+        expect.objectContaining({
+          title: createdTask.title,
+          status: TaskStatus.NOT_STARTED,
+          projectId: "project-42",
+        }),
+        "ws-1"
+      );
+    });
+  });
+
+  it("cancels add-task form when pressing Escape", async (): Promise<void> => {
+    const user = userEvent.setup();
+
+    render(<KanbanPage />);
+
+    await waitFor((): void => {
+      expect(screen.getByText("Kanban Board")).toBeInTheDocument();
+    });
+
+    // Click the "+ Add task" button
+    const addTaskButtons = screen.getAllByRole("button", { name: /\+ Add task/i });
+    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+    await user.click(addTaskButtons[0]!);
+
+    // Type in the title input
+    const titleInput = screen.getByPlaceholderText("Task title...");
+    await user.type(titleInput, "Test task");
+
+    // Press Escape to cancel
+    await user.keyboard("{Escape}");
+
+    // Form should be closed, back to "+ Add task" button
+    await waitFor((): void => {
+      const buttons = screen.getAllByRole("button", { name: /\+ Add task/i });
+      expect(buttons.length).toBe(5); // One per column
+    });
+
+    // Should not have called createTask
+    expect(mockCreateTask).not.toHaveBeenCalled();
+  });
+});