diff --git a/frontend/package.json b/frontend/package.json
index b7305124..eae80f94 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -8,6 +8,7 @@
     "start": "next start",
     "lint": "eslint",
     "test": "vitest run --passWithNoTests --coverage",
+    "test:full-coverage": "vitest run --passWithNoTests --coverage --config ./vitest.full-coverage.config.ts",
     "test:watch": "vitest",
     "dev:lan": "next dev --hostname 0.0.0.0 --port 3000",
     "api:gen": "orval --config ./orval.config.ts",
diff --git a/frontend/src/components/molecules/TaskCard.test.tsx b/frontend/src/components/molecules/TaskCard.test.tsx
new file mode 100644
index 00000000..fde0daba
--- /dev/null
+++ b/frontend/src/components/molecules/TaskCard.test.tsx
@@ -0,0 +1,67 @@
+import { fireEvent, render, screen } from "@testing-library/react";
+import { describe, expect, it, vi } from "vitest";
+
+import { TaskCard } from "./TaskCard";
+
+describe("TaskCard", () => {
+  it("renders title, assignee, and due date", () => {
+    render(
+      <TaskCard
+        title="Fix flaky test"
+        assignee="Zara"
+        due="Feb 11"
+        priority="high"
+      />,
+    );
+
+    expect(screen.getByText("Fix flaky test")).toBeInTheDocument();
+    expect(screen.getByText("Zara")).toBeInTheDocument();
+    expect(screen.getByText("Feb 11")).toBeInTheDocument();
+    expect(screen.getByText("HIGH")).toBeInTheDocument();
+  });
+
+  it("shows blocked state with count", () => {
+    render(
+      <TaskCard title="Blocked task" isBlocked blockedByCount={2} priority="low" />,
+    );
+
+    expect(screen.getByText(/Blocked · 2/i)).toBeInTheDocument();
+  });
+
+  it("shows approvals pending indicator", () => {
+    render(
+      <TaskCard
+        title="Needs approval"
+        approvalsPendingCount={3}
+        priority="medium"
+      />,
+    );
+
+    expect(screen.getByText(/Approval needed · 3/i)).toBeInTheDocument();
+  });
+
+  it("shows lead review indicator when status is review with no approvals and not blocked", () => {
+    render(<TaskCard title="Waiting" status="review" approvalsPendingCount={0} />);
+
+    expect(screen.getByText(/Waiting for lead review/i)).toBeInTheDocument();
+  });
+
+  it("invokes onClick for mouse and keyboard activation", () => {
+    const onClick = vi.fn();
+
+    render(<TaskCard title="Clickable" onClick={onClick} />);
+
+    fireEvent.click(screen.getByRole("button", { name: /Clickable/i }));
+    expect(onClick).toHaveBeenCalledTimes(1);
+
+    fireEvent.keyDown(screen.getByRole("button", { name: /Clickable/i }), {
+      key: "Enter",
+    });
+    expect(onClick).toHaveBeenCalledTimes(2);
+
+    fireEvent.keyDown(screen.getByRole("button", { name: /Clickable/i }), {
+      key: " ",
+    });
+    expect(onClick).toHaveBeenCalledTimes(3);
+  });
+});
diff --git a/frontend/src/components/organisms/TaskBoard.test.tsx b/frontend/src/components/organisms/TaskBoard.test.tsx
index 35fb111f..1f37b7c1 100644
--- a/frontend/src/components/organisms/TaskBoard.test.tsx
+++ b/frontend/src/components/organisms/TaskBoard.test.tsx
@@ -1,8 +1,31 @@
-import { render, screen } from "@testing-library/react";
-import { describe, expect, it } from "vitest";
+import { fireEvent, render, screen, within } from "@testing-library/react";
+import { describe, expect, it, vi } from "vitest";
 
 import { TaskBoard } from "./TaskBoard";
 
+type TaskStatus = "inbox" | "in_progress" | "review" | "done";
+
+type Task = {
+  id: string;
+  title: string;
+  status: TaskStatus;
+  priority: string;
+  approvals_pending_count?: number;
+  blocked_by_task_ids?: string[];
+  is_blocked?: boolean;
+};
+
+const buildTask = (overrides: Partial<Task> = {}): Task => ({
+  id: `task-${Math.random().toString(16).slice(2)}`,
+  title: "Task",
+  status: "inbox",
+  priority: "medium",
+  approvals_pending_count: 0,
+  blocked_by_task_ids: [],
+  is_blocked: false,
+  ...overrides,
+});
+
 describe("TaskBoard", () => {
   it("uses a mobile-first stacked layout (no horizontal scroll) with responsive kanban columns on larger screens", () => {
     render(
@@ -48,4 +71,130 @@ describe("TaskBoard", () => {
     // Ensure we didn't accidentally keep unscoped sticky behavior.
     expect(header?.className).not.toContain("sticky top-0");
   });
+
+  it("renders the 4 columns and shows per-column counts", () => {
+    const tasks: Task[] = [
+      buildTask({ id: "t1", title: "Inbox A", status: "inbox" }),
+      buildTask({ id: "t2", title: "Doing A", status: "in_progress" }),
+      buildTask({ id: "t3", title: "Review A", status: "review" }),
+      buildTask({ id: "t4", title: "Done A", status: "done" }),
+      buildTask({ id: "t5", title: "Inbox B", status: "inbox" }),
+    ];
+
+    render(<TaskBoard tasks={tasks} />);
+
+    expect(screen.getByRole("heading", { name: "Inbox" })).toBeInTheDocument();
+    expect(
+      screen.getByRole("heading", { name: "In Progress" }),
+    ).toBeInTheDocument();
+    expect(screen.getByRole("heading", { name: "Review" })).toBeInTheDocument();
+    expect(screen.getByRole("heading", { name: "Done" })).toBeInTheDocument();
+
+    // Column count badges are plain spans; easiest stable check is text occurrence.
+    expect(screen.getAllByText("2").length).toBeGreaterThanOrEqual(1);
+    expect(screen.getAllByText("1").length).toBeGreaterThanOrEqual(1);
+
+    expect(screen.getByText("Inbox A")).toBeInTheDocument();
+    expect(screen.getByText("Inbox B")).toBeInTheDocument();
+  });
+
+  it("filters the review column by bucket", () => {
+    const tasks: Task[] = [
+      buildTask({
+        id: "blocked",
+        title: "Blocked Review",
+        status: "review",
+        is_blocked: true,
+        blocked_by_task_ids: ["dep-1"],
+      }),
+      buildTask({
+        id: "approval",
+        title: "Needs Approval",
+        status: "review",
+        approvals_pending_count: 2,
+      }),
+      buildTask({
+        id: "lead",
+        title: "Lead Review",
+        status: "review",
+      }),
+    ];
+
+    render(<TaskBoard tasks={tasks} />);
+
+    const reviewHeading = screen.getByRole("heading", { name: "Review" });
+    const reviewColumn = reviewHeading.closest(".kanban-column");
+    expect(reviewColumn).toBeTruthy();
+    if (!reviewColumn) return;
+
+    const header = reviewColumn.querySelector(".column-header");
+    expect(header).toBeTruthy();
+    if (!header) return;
+
+    const headerQueries = within(header);
+
+    expect(headerQueries.getByRole("button", { name: /All · 3/i })).toBeInTheDocument();
+    expect(
+      headerQueries.getByRole("button", { name: /Approval needed · 1/i }),
+    ).toBeInTheDocument();
+    expect(
+      headerQueries.getByRole("button", { name: /Lead review · 1/i }),
+    ).toBeInTheDocument();
+    expect(
+      headerQueries.getByRole("button", { name: /Blocked · 1/i }),
+    ).toBeInTheDocument();
+
+    fireEvent.click(headerQueries.getByRole("button", { name: /Blocked · 1/i }));
+    expect(screen.getByText("Blocked Review")).toBeInTheDocument();
+    expect(screen.queryByText("Needs Approval")).not.toBeInTheDocument();
+    expect(screen.queryByText("Lead Review")).not.toBeInTheDocument();
+
+    fireEvent.click(
+      headerQueries.getByRole("button", { name: /Approval needed · 1/i }),
+    );
+    expect(screen.getByText("Needs Approval")).toBeInTheDocument();
+    expect(screen.queryByText("Blocked Review")).not.toBeInTheDocument();
+    expect(screen.queryByText("Lead Review")).not.toBeInTheDocument();
+
+    fireEvent.click(
+      headerQueries.getByRole("button", { name: /Lead review · 1/i }),
+    );
+    expect(screen.getByText("Lead Review")).toBeInTheDocument();
+    expect(screen.queryByText("Blocked Review")).not.toBeInTheDocument();
+    expect(screen.queryByText("Needs Approval")).not.toBeInTheDocument();
+  });
+
+  it("invokes onTaskMove when a task is dropped onto a different column", () => {
+    const onTaskMove = vi.fn();
+    const tasks: Task[] = [
+      buildTask({ id: "t1", title: "Inbox A", status: "inbox" }),
+    ];
+
+    render(<TaskBoard tasks={tasks} onTaskMove={onTaskMove} />);
+
+    const dropTarget = screen
+      .getByRole("heading", { name: "Done" })
+      .closest(".kanban-column");
+    expect(dropTarget).toBeTruthy();
+    if (!dropTarget) return;
+
+    fireEvent.drop(dropTarget, {
+      dataTransfer: {
+        getData: () => JSON.stringify({ taskId: "t1", status: "inbox" }),
+      },
+    });
+
+    expect(onTaskMove).toHaveBeenCalledWith("t1", "done");
+  });
+
+  it("does not allow dragging when readOnly is true", () => {
+    const tasks: Task[] = [buildTask({ id: "t1", title: "Inbox A" })];
+
+    render(<TaskBoard tasks={tasks} readOnly />);
+
+    expect(screen.getByRole("button", { name: /Inbox A/i })).toHaveAttribute(
+      "draggable",
+      "false",
+    );
+  });
 });
diff --git a/frontend/vitest.full-coverage.config.ts b/frontend/vitest.full-coverage.config.ts
new file mode 100644
index 00000000..59eea1d4
--- /dev/null
+++ b/frontend/vitest.full-coverage.config.ts
@@ -0,0 +1,37 @@
+import path from "node:path";
+
+import { defineConfig } from "vitest/config";
+
+// Broader coverage config used for gap analysis.
+// - Does NOT enforce 100% thresholds.
+// - Includes most source files (excluding generated artifacts and types).
+// Keep the default vitest.config.ts as the scoped coverage gate.
+export default defineConfig({
+  resolve: {
+    alias: {
+      "@": path.resolve(__dirname, "./src"),
+    },
+  },
+  test: {
+    environment: "jsdom",
+    setupFiles: ["./src/setupTests.ts"],
+    globals: true,
+    coverage: {
+      provider: "v8",
+      reporter: ["text", "lcov"],
+      reportsDirectory: "./coverage-full",
+      include: ["src/**/*.{ts,tsx}"],
+      exclude: [
+        "**/*.d.ts",
+        "src/**/__generated__/**",
+        "src/**/generated/**",
+      ],
+      thresholds: {
+        lines: 0,
+        statements: 0,
+        functions: 0,
+        branches: 0,
+      },
+    },
+  },
+});