diff --git a/apps/tauri/package-lock.json b/apps/tauri/package-lock.json
index 34449bf..21bbf48 100644
--- a/apps/tauri/package-lock.json
+++ b/apps/tauri/package-lock.json
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+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
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+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT-0",
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+        "css-tree": "^3.2.1"
+      },
+      "peerDependenciesMeta": {
+        "css-tree": {
+          "optional": true
+        }
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+    },
+    "node_modules/@csstools/css-tokenizer": {
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+      "resolved": "https://registry.npmjs.org/@csstools/css-tokenizer/-/css-tokenizer-4.0.0.tgz",
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+      "license": "MIT",
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     },
     "node_modules/@esbuild/aix-ppc64": {
@@ -464,6 +715,24 @@
         "node": ">=18"
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@@ -864,6 +1133,13 @@
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@@ -1431,6 +1707,142 @@
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       }
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@@ -2089,6 +2975,26 @@
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@@ -2099,6 +3005,33 @@
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+      "license": "MIT"
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+      "resolved": "https://registry.npmjs.org/std-env/-/std-env-4.1.0.tgz",
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+      "license": "MIT"
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@@ -2127,6 +3060,13 @@
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       "resolved": "https://registry.npmjs.org/tailwindcss/-/tailwindcss-4.2.1.tgz",
@@ -2148,6 +3088,23 @@
         "url": "https://opencollective.com/webpack"
       }
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+      "resolved": "https://registry.npmjs.org/tinybench/-/tinybench-2.9.0.tgz",
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+      "license": "MIT"
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+      "resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-1.1.1.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
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+      }
+    },
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       "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.15.tgz",
@@ -2165,6 +3122,62 @@
         "url": "https://github.com/sponsors/SuperchupuDev"
       }
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+    "node_modules/tinyrainbow": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/tinyrainbow/-/tinyrainbow-3.1.0.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
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+    "node_modules/tldts": {
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
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+      "bin": {
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+      "license": "MIT"
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+    "node_modules/tough-cookie": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-6.0.1.tgz",
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+      "dev": true,
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "tldts": "^7.0.5"
+      },
+      "engines": {
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+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-6.0.0.tgz",
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+      "dev": true,
+      "license": "MIT",
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+      },
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       "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
@@ -2179,6 +3192,16 @@
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+      "version": "7.25.0",
+      "resolved": "https://registry.npmjs.org/undici/-/undici-7.25.0.tgz",
+      "integrity": "sha512-xXnp4kTyor2Zq+J1FfPI6Eq3ew5h6Vl0F/8d9XU5zZQf1tX9s2Su1/3PiMmUANFULpmksxkClamIZcaUqryHsQ==",
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+      "license": "MIT",
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       "resolved": "https://registry.npmjs.org/vite/-/vite-6.4.1.tgz",
@@ -2274,6 +3297,178 @@
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+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-4.1.4.tgz",
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+        "magic-string": "^0.30.21",
+        "obug": "^2.1.1",
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+        "@vitest/browser-webdriverio": "4.1.4",
+        "@vitest/coverage-istanbul": "4.1.4",
+        "@vitest/coverage-v8": "4.1.4",
+        "@vitest/ui": "4.1.4",
+        "happy-dom": "*",
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+      "dev": true,
+      "license": "Apache-2.0",
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diff --git a/apps/tauri/package.json b/apps/tauri/package.json
index c812985..06b22d4 100644
--- a/apps/tauri/package.json
+++ b/apps/tauri/package.json
@@ -7,16 +7,23 @@
     "dev": "vite",
     "build": "vite build",
     "preview": "vite preview",
-    "tauri": "tauri"
+    "tauri": "tauri",
+    "test": "vitest run",
+    "test:watch": "vitest"
   },
   "devDependencies": {
     "@sveltejs/vite-plugin-svelte": "^5.0.0",
     "@tailwindcss/vite": "^4.0.0",
     "@tauri-apps/cli": "^2.0.0",
+    "@testing-library/jest-dom": "^6.9.1",
+    "@testing-library/svelte": "^5.3.1",
+    "@testing-library/user-event": "^14.6.1",
+    "jsdom": "^29.0.2",
     "svelte": "^5.0.0",
     "tailwindcss": "^4.0.0",
     "typescript": "^5.6.0",
-    "vite": "^6.0.0"
+    "vite": "^6.0.0",
+    "vitest": "^4.1.4"
   },
   "dependencies": {
     "@tauri-apps/api": "^2.0.0",
diff --git a/apps/tauri/src/lib/components/ConfirmDialog.test.ts b/apps/tauri/src/lib/components/ConfirmDialog.test.ts
new file mode 100644
index 0000000..c31c54a
--- /dev/null
+++ b/apps/tauri/src/lib/components/ConfirmDialog.test.ts
@@ -0,0 +1,105 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { render, screen, cleanup } from "@testing-library/svelte";
+import userEvent from "@testing-library/user-event";
+import ConfirmDialog, { isConfirmDialogOpen } from "./ConfirmDialog.svelte";
+
+beforeEach(() => {
+  cleanup();
+});
+
+describe("ConfirmDialog", () => {
+  it("renders the message, detail and custom confirm label", () => {
+    render(ConfirmDialog, {
+      message: "Delete task?",
+      detail: "This cannot be undone.",
+      confirmText: "Delete",
+      onconfirm: vi.fn(),
+      oncancel: vi.fn(),
+    });
+    expect(screen.getByText("Delete task?")).toBeInTheDocument();
+    expect(screen.getByText("This cannot be undone.")).toBeInTheDocument();
+    expect(screen.getByRole("button", { name: "Delete" })).toBeInTheDocument();
+    expect(screen.getByRole("button", { name: "Cancel" })).toBeInTheDocument();
+  });
+
+  it("fires oncancel when Cancel is clicked", async () => {
+    const user = userEvent.setup();
+    const oncancel = vi.fn();
+    render(ConfirmDialog, {
+      message: "Delete?",
+      onconfirm: vi.fn(),
+      oncancel,
+    });
+    await user.click(screen.getByRole("button", { name: "Cancel" }));
+    expect(oncancel).toHaveBeenCalledTimes(1);
+  });
+
+  it("fires onconfirm when Confirm is clicked and not oncancel", async () => {
+    const user = userEvent.setup();
+    const onconfirm = vi.fn();
+    const oncancel = vi.fn();
+    render(ConfirmDialog, {
+      message: "Delete?",
+      confirmText: "Delete",
+      onconfirm,
+      oncancel,
+    });
+    await user.click(screen.getByRole("button", { name: "Delete" }));
+    expect(onconfirm).toHaveBeenCalledTimes(1);
+    expect(oncancel).not.toHaveBeenCalled();
+  });
+
+  it("cancels and stops propagation on Escape (regression: used to bubble and pop task detail)", async () => {
+    const oncancel = vi.fn();
+    // An outer bubble-phase listener emulates TasksScreen's svelte:window
+    // Escape handler. If the dialog leaks Escape, this spy fires too.
+    const outer = vi.fn();
+    window.addEventListener("keydown", outer);
+    try {
+      render(ConfirmDialog, {
+        message: "Delete?",
+        onconfirm: vi.fn(),
+        oncancel,
+      });
+      window.dispatchEvent(new KeyboardEvent("keydown", { key: "Escape", bubbles: true, cancelable: true }));
+      expect(oncancel).toHaveBeenCalledTimes(1);
+      expect(outer).not.toHaveBeenCalled();
+    } finally {
+      window.removeEventListener("keydown", outer);
+    }
+  });
+
+  it("ignores non-Escape keydowns", async () => {
+    const oncancel = vi.fn();
+    render(ConfirmDialog, {
+      message: "Delete?",
+      onconfirm: vi.fn(),
+      oncancel,
+    });
+    window.dispatchEvent(new KeyboardEvent("keydown", { key: "a" }));
+    window.dispatchEvent(new KeyboardEvent("keydown", { key: "Enter" }));
+    expect(oncancel).not.toHaveBeenCalled();
+  });
+
+  it("increments the open-count singleton so parent Escape handlers can defer", () => {
+    expect(isConfirmDialogOpen()).toBe(false);
+    const { unmount } = render(ConfirmDialog, {
+      message: "Delete?",
+      onconfirm: vi.fn(),
+      oncancel: vi.fn(),
+    });
+    expect(isConfirmDialogOpen()).toBe(true);
+    unmount();
+    expect(isConfirmDialogOpen()).toBe(false);
+  });
+
+  it("tracks multiple concurrently-mounted dialogs and releases on unmount", () => {
+    const a = render(ConfirmDialog, { message: "A?", onconfirm: vi.fn(), oncancel: vi.fn() });
+    const b = render(ConfirmDialog, { message: "B?", onconfirm: vi.fn(), oncancel: vi.fn() });
+    expect(isConfirmDialogOpen()).toBe(true);
+    a.unmount();
+    expect(isConfirmDialogOpen()).toBe(true);
+    b.unmount();
+    expect(isConfirmDialogOpen()).toBe(false);
+  });
+});
diff --git a/apps/tauri/src/lib/grouping.test.ts b/apps/tauri/src/lib/grouping.test.ts
new file mode 100644
index 0000000..01a27f0
--- /dev/null
+++ b/apps/tauri/src/lib/grouping.test.ts
@@ -0,0 +1,97 @@
+import { describe, it, expect } from "vitest";
+import { groupTasksByDate } from "./grouping";
+import type { Task } from "./types";
+
+// 2026-04-17 12:00 local time — "today" in the fixtures below.
+const NOW = new Date(2026, 3, 17, 12, 0, 0);
+
+function task(partial: Partial<Task> & { id: string }): Task {
+  return {
+    id: partial.id,
+    title: partial.title ?? partial.id,
+    description: "",
+    status: "backlog",
+    date: partial.date ?? null,
+    has_time: partial.has_time ?? false,
+    version: 1,
+    parent_id: null,
+    ...partial,
+  };
+}
+
+describe("groupTasksByDate", () => {
+  it("returns an empty array when there are no pending tasks", () => {
+    expect(groupTasksByDate([], NOW)).toEqual([]);
+  });
+
+  it("puts 'No Date' last — regression: was first, burying urgent tasks", () => {
+    const tasks = [
+      task({ id: "overdue", date: "2026-04-15T00:00:00Z" }),
+      task({ id: "no-date" }),
+      task({ id: "today", date: "2026-04-17T09:00:00Z" }),
+    ];
+    const labels = groupTasksByDate(tasks, NOW).map((g) => g.label);
+    expect(labels).toEqual(["Overdue", "Today", "No Date"]);
+  });
+
+  it("orders dated buckets: Overdue, Today, Tomorrow, future…, then No Date", () => {
+    const tasks = [
+      task({ id: "nd1" }),
+      task({ id: "future", date: "2026-04-20T00:00:00Z" }),
+      task({ id: "tomorrow", date: "2026-04-18T00:00:00Z" }),
+      task({ id: "today", date: "2026-04-17T09:00:00Z" }),
+      task({ id: "overdue", date: "2026-04-10T00:00:00Z" }),
+    ];
+    const labels = groupTasksByDate(tasks, NOW).map((g) => g.label);
+    expect(labels[0]).toBe("Overdue");
+    expect(labels[1]).toBe("Today");
+    expect(labels[2]).toBe("Tomorrow");
+    // One future day label between tomorrow and No Date
+    expect(labels[labels.length - 1]).toBe("No Date");
+    expect(labels).toHaveLength(5);
+  });
+
+  it("drops empty buckets", () => {
+    const tasks = [task({ id: "t1", date: "2026-04-17T08:00:00Z" })];
+    expect(groupTasksByDate(tasks, NOW).map((g) => g.label)).toEqual(["Today"]);
+  });
+
+  it("sorts tasks within a bucket by due time ascending, stable on ties", () => {
+    const tasks = [
+      task({ id: "b", date: "2026-04-17T15:00:00Z", has_time: true }),
+      task({ id: "a", date: "2026-04-17T09:00:00Z", has_time: true }),
+      task({ id: "c", date: "2026-04-17T15:00:00Z", has_time: true }),
+    ];
+    const today = groupTasksByDate(tasks, NOW).find((g) => g.label === "Today")!;
+    expect(today.tasks.map((t) => t.id)).toEqual(["a", "b", "c"]);
+  });
+
+  it("places a task with today's date but time before 'now' in the Today bucket (not Overdue)", () => {
+    const tasks = [task({ id: "earlier-today", date: "2026-04-17T08:00:00Z" })];
+    const groups = groupTasksByDate(tasks, NOW);
+    expect(groups.map((g) => g.label)).toEqual(["Today"]);
+  });
+
+  it("preserves No Date order as given by the caller", () => {
+    const tasks = [
+      task({ id: "z" }),
+      task({ id: "a" }),
+      task({ id: "m" }),
+    ];
+    const nd = groupTasksByDate(tasks, NOW).find((g) => g.label === "No Date")!;
+    expect(nd.tasks.map((t) => t.id)).toEqual(["z", "a", "m"]);
+  });
+
+  it("groups multiple tasks on the same future day under one label", () => {
+    const tasks = [
+      task({ id: "f1", date: "2026-04-25T09:00:00Z", has_time: true }),
+      task({ id: "f2", date: "2026-04-25T14:00:00Z", has_time: true }),
+    ];
+    const groups = groupTasksByDate(tasks, NOW);
+    const future = groups.find((g) => g.date?.getDate() === 25);
+    expect(future).toBeDefined();
+    expect(future!.tasks.map((t) => t.id)).toEqual(["f1", "f2"]);
+    // And it comes before No Date (which is absent here).
+    expect(groups).toHaveLength(1);
+  });
+});
diff --git a/apps/tauri/src/lib/grouping.ts b/apps/tauri/src/lib/grouping.ts
new file mode 100644
index 0000000..56fb277
--- /dev/null
+++ b/apps/tauri/src/lib/grouping.ts
@@ -0,0 +1,70 @@
+import type { Task } from "./types";
+
+export type TaskGroup = { label: string; tasks: Task[]; date: Date | null };
+
+/**
+ * Group pending tasks into date buckets for the "group by date" view.
+ *
+ * Order:
+ *   Overdue → Today → Tomorrow → future days (chronological) → No Date
+ *
+ * Within each dated bucket tasks sort by due date+time ascending, with the
+ * original `pendingTasks` index as a stable tiebreaker. "No Date" preserves
+ * the caller-supplied order.
+ */
+export function groupTasksByDate(pendingTasks: Task[], now: Date = new Date()): TaskGroup[] {
+  const todayStart = new Date(now.getFullYear(), now.getMonth(), now.getDate());
+  const tomorrowStart = new Date(todayStart);
+  tomorrowStart.setDate(todayStart.getDate() + 1);
+
+  const overdue: Task[] = [];
+  const today: Task[] = [];
+  const tomorrow: Task[] = [];
+  const futureByDay = new Map<string, { date: Date; tasks: Task[] }>();
+  const noDate: Task[] = [];
+
+  for (const task of pendingTasks) {
+    if (!task.date) {
+      noDate.push(task);
+    } else {
+      const d = new Date(task.date);
+      const dayStart = new Date(d.getFullYear(), d.getMonth(), d.getDate());
+      if (dayStart < todayStart) overdue.push(task);
+      else if (dayStart.getTime() === todayStart.getTime()) today.push(task);
+      else if (dayStart.getTime() === tomorrowStart.getTime()) tomorrow.push(task);
+      else {
+        const key = dayStart.toISOString();
+        if (!futureByDay.has(key)) futureByDay.set(key, { date: dayStart, tasks: [] });
+        futureByDay.get(key)!.tasks.push(task);
+      }
+    }
+  }
+
+  const taskOrderIndex = new Map(pendingTasks.map((t, i) => [t.id, i]));
+  const sortByDue = (a: Task, b: Task) => {
+    const dateDiff = new Date(a.date!).getTime() - new Date(b.date!).getTime();
+    if (dateDiff !== 0) return dateDiff;
+    return (taskOrderIndex.get(a.id) ?? 0) - (taskOrderIndex.get(b.id) ?? 0);
+  };
+  overdue.sort(sortByDue);
+  today.sort(sortByDue);
+  tomorrow.sort(sortByDue);
+
+  const groups: TaskGroup[] = [];
+  if (overdue.length) groups.push({ label: "Overdue", tasks: overdue, date: null });
+  if (today.length) groups.push({ label: "Today", tasks: today, date: todayStart });
+  if (tomorrow.length) groups.push({ label: "Tomorrow", tasks: tomorrow, date: tomorrowStart });
+
+  const currentYear = now.getFullYear();
+  for (const [, { date, tasks }] of [...futureByDay.entries()].sort(([a], [b]) => a.localeCompare(b))) {
+    tasks.sort(sortByDue);
+    const opts: Intl.DateTimeFormatOptions = date.getFullYear() !== currentYear
+      ? { weekday: "short", month: "short", day: "numeric", year: "numeric" }
+      : { weekday: "short", month: "short", day: "numeric" };
+    groups.push({ label: date.toLocaleDateString(undefined, opts), tasks, date });
+  }
+
+  if (noDate.length) groups.push({ label: "No Date", tasks: noDate, date: null });
+
+  return groups;
+}
diff --git a/apps/tauri/src/lib/paths.test.ts b/apps/tauri/src/lib/paths.test.ts
new file mode 100644
index 0000000..46f872c
--- /dev/null
+++ b/apps/tauri/src/lib/paths.test.ts
@@ -0,0 +1,38 @@
+import { describe, it, expect } from "vitest";
+import { workspaceNameFromPath } from "./paths";
+
+describe("workspaceNameFromPath", () => {
+  it("returns the last path component of a POSIX path", () => {
+    expect(workspaceNameFromPath("/home/me/Tasks")).toBe("Tasks");
+  });
+
+  it("strips a trailing slash (regression: used to fall back to 'workspace')", () => {
+    expect(workspaceNameFromPath("/home/me/Tasks/")).toBe("Tasks");
+  });
+
+  it("strips multiple trailing slashes", () => {
+    expect(workspaceNameFromPath("/home/me/Tasks///")).toBe("Tasks");
+  });
+
+  it("handles Windows-style backslash paths", () => {
+    expect(workspaceNameFromPath("C:\\Users\\me\\Tasks")).toBe("Tasks");
+  });
+
+  it("strips a trailing backslash on Windows paths", () => {
+    expect(workspaceNameFromPath("C:\\Users\\me\\Tasks\\")).toBe("Tasks");
+  });
+
+  it("handles mixed separators", () => {
+    expect(workspaceNameFromPath("C:\\Users/me\\Tasks")).toBe("Tasks");
+  });
+
+  it("falls back to 'workspace' when the path has no usable tail", () => {
+    expect(workspaceNameFromPath("/")).toBe("workspace");
+    expect(workspaceNameFromPath("\\")).toBe("workspace");
+    expect(workspaceNameFromPath("")).toBe("workspace");
+  });
+
+  it("preserves names with spaces", () => {
+    expect(workspaceNameFromPath("/home/me/My Tasks/")).toBe("My Tasks");
+  });
+});
diff --git a/apps/tauri/src/lib/paths.ts b/apps/tauri/src/lib/paths.ts
new file mode 100644
index 0000000..2c60079
--- /dev/null
+++ b/apps/tauri/src/lib/paths.ts
@@ -0,0 +1,9 @@
+/**
+ * Derive a workspace display name from a folder path picked via the file
+ * dialog. Handles both `/` and `\` separators and tolerates trailing
+ * separators (e.g. `"/home/me/Tasks/"` → `"Tasks"`, not `"workspace"`).
+ */
+export function workspaceNameFromPath(folder: string): string {
+  const parts = folder.replace(/[\\/]+$/, "").split(/[\\/]/);
+  return parts[parts.length - 1] || "workspace";
+}
diff --git a/apps/tauri/src/lib/screens/SetupScreen.svelte b/apps/tauri/src/lib/screens/SetupScreen.svelte
index 84b9b62..7a1ad4f 100644
--- a/apps/tauri/src/lib/screens/SetupScreen.svelte
+++ b/apps/tauri/src/lib/screens/SetupScreen.svelte
@@ -5,6 +5,7 @@
   import { app } from "../stores/app.svelte";
   import { getCurrentWindow } from "@tauri-apps/api/window";
   import { platform } from "@tauri-apps/plugin-os";
+  import { workspaceNameFromPath } from "../paths";
 
   let { cancellable = false }: { cancellable?: boolean } = $props();
 
@@ -71,11 +72,7 @@
     const selected = await open({ directory: true, multiple: false });
     if (!selected) return;
     const folder = selected as string;
-    // Strip trailing separators before splitting so a path like "/home/me/Tasks/"
-    // yields "Tasks" instead of an empty tail that falls through to "workspace".
-    const parts = folder.replace(/[\\/]+$/, "").split(/[\\/]/);
-    const wsName = parts[parts.length - 1] || "workspace";
-    await app.addWorkspace(wsName, folder);
+    await app.addWorkspace(workspaceNameFromPath(folder), folder);
   }
 
   // ── WebDAV handlers ───────────────────────────────────────────────
diff --git a/apps/tauri/src/lib/stores/app.svelte.ts b/apps/tauri/src/lib/stores/app.svelte.ts
index 65c7f3c..10031b6 100644
--- a/apps/tauri/src/lib/stores/app.svelte.ts
+++ b/apps/tauri/src/lib/stores/app.svelte.ts
@@ -8,6 +8,7 @@ import type {
   Screen,
   SyncResult,
 } from "../types";
+import { groupTasksByDate, type TaskGroup } from "../grouping";
 
 // Listen for file system changes from the backend watcher.
 listen("fs-changed", () => {
@@ -52,65 +53,9 @@ let activeList = $derived(lists.find((l) => l.id === activeListId) ?? null);
 let pendingTasks = $derived(tasks.filter((t) => t.status === "backlog" && !t.parent_id));
 let completedTasks = $derived(tasks.filter((t) => t.status === "completed" && !t.parent_id));
 
-type TaskGroup = { label: string; tasks: Task[]; date: Date | null };
-
 let groupedPendingTasks = $derived.by((): TaskGroup[] | null => {
   if (!activeList?.group_by_date) return null;
-  const now = new Date();
-  const todayStart = new Date(now.getFullYear(), now.getMonth(), now.getDate());
-  const tomorrowStart = new Date(todayStart);
-  tomorrowStart.setDate(todayStart.getDate() + 1);
-
-  const overdue: Task[] = [];
-  const today: Task[] = [];
-  const tomorrow: Task[] = [];
-  const futureByDay = new Map<string, { date: Date; tasks: Task[] }>();
-  const noDate: Task[] = [];
-
-  for (const task of pendingTasks) {
-    if (!task.date) {
-      noDate.push(task);
-    } else {
-      const d = new Date(task.date);
-      const dayStart = new Date(d.getFullYear(), d.getMonth(), d.getDate());
-      if (dayStart < todayStart) overdue.push(task);
-      else if (dayStart.getTime() === todayStart.getTime()) today.push(task);
-      else if (dayStart.getTime() === tomorrowStart.getTime()) tomorrow.push(task);
-      else {
-        const key = dayStart.toISOString();
-        if (!futureByDay.has(key)) futureByDay.set(key, { date: dayStart, tasks: [] });
-        futureByDay.get(key)!.tasks.push(task);
-      }
-    }
-  }
-
-  const taskOrderIndex = new Map(pendingTasks.map((t, i) => [t.id, i]));
-  const sortByDue = (a: Task, b: Task) => {
-    const dateDiff = new Date(a.date!).getTime() - new Date(b.date!).getTime();
-    if (dateDiff !== 0) return dateDiff;
-    return (taskOrderIndex.get(a.id) ?? 0) - (taskOrderIndex.get(b.id) ?? 0);
-  };
-  overdue.sort(sortByDue);
-  today.sort(sortByDue);
-  tomorrow.sort(sortByDue);
-
-  const groups: TaskGroup[] = [];
-  if (overdue.length) groups.push({ label: "Overdue", tasks: overdue, date: null });
-  if (today.length) groups.push({ label: "Today", tasks: today, date: todayStart });
-  if (tomorrow.length) groups.push({ label: "Tomorrow", tasks: tomorrow, date: tomorrowStart });
-
-  const currentYear = now.getFullYear();
-  for (const [, { date, tasks }] of [...futureByDay.entries()].sort(([a], [b]) => a.localeCompare(b))) {
-    tasks.sort(sortByDue);
-    const opts: Intl.DateTimeFormatOptions = date.getFullYear() !== currentYear
-      ? { weekday: "short", month: "short", day: "numeric", year: "numeric" }
-      : { weekday: "short", month: "short", day: "numeric" };
-    groups.push({ label: date.toLocaleDateString(undefined, opts), tasks, date });
-  }
-
-  if (noDate.length) groups.push({ label: "No Date", tasks: noDate, date: null });
-
-  return groups;
+  return groupTasksByDate(pendingTasks);
 });
 
 // Build a map of parent_id -> children for subtask hierarchy
diff --git a/apps/tauri/src/test/setup.ts b/apps/tauri/src/test/setup.ts
new file mode 100644
index 0000000..f149f27
--- /dev/null
+++ b/apps/tauri/src/test/setup.ts
@@ -0,0 +1 @@
+import "@testing-library/jest-dom/vitest";
diff --git a/apps/tauri/vite.config.ts b/apps/tauri/vite.config.ts
index ac1fb4c..910579b 100644
--- a/apps/tauri/vite.config.ts
+++ b/apps/tauri/vite.config.ts
@@ -1,3 +1,4 @@
+/// <reference types="vitest/config" />
 import { defineConfig } from "vite";
 import { svelte } from "@sveltejs/vite-plugin-svelte";
 import tailwindcss from "@tailwindcss/vite";
@@ -14,4 +15,17 @@ export default defineConfig({
     hmr: host ? { protocol: "ws", host, port: 1421 } : undefined,
     watch: { ignored: ["**/src-tauri/**"] },
   },
+  test: {
+    environment: "jsdom",
+    globals: true,
+    setupFiles: ["./src/test/setup.ts"],
+    include: ["src/**/*.{test,spec}.{ts,svelte}"],
+    // Resolve Svelte's client (browser) entry under Vitest — without the
+    // browser condition mount() picks up Svelte's SSR export and throws
+    // lifecycle_function_unavailable.
+    server: { deps: { inline: ["@testing-library/svelte"] } },
+  },
+  resolve: {
+    conditions: process.env.VITEST ? ["browser"] : [],
+  },
 });