chore: extract shared tsconfig, move display-status to core, add i18n tests

- Add `@sofa/tsconfig` package with a shared `base.json` (target, lib, strict, moduleResolution, etc.) and migrate all packages/apps to `"extends": "@sofa/tsconfig/base.json"` to eliminate duplicated compiler options
- Move `display-status.ts` (and its `DisplayStatus` type + `getDisplayStatus` fn) from `@sofa/api` to `@sofa/core`; remove the `./display-status` export from `@sofa/api` and update all import sites in `discovery.ts` and `tracking.ts`
- Add `packages/core/test/display-status.test.ts`: 15 tests covering `ONGOING_TMDB_STATUSES` and all `getDisplayStatus` branches (movie, TV watchlist/in_progress/caught_up/completed, edge cases)
- Add `packages/i18n/vitest.config.ts` and two new test files: `date-buckets.test.ts` and `format.test.ts` covering date bucketing and locale formatting utilities

packages/i18n/test/date-buckets.test.ts

@@ -0,0 +1,111 @@
+import { afterEach, beforeEach, describe, expect, test, vi } from "vitest";
+
+vi.mock("../src/index", () => ({
+  i18n: {
+    locale: "en",
+    _: (descriptor: { id?: string; message?: string } | string) => {
+      if (typeof descriptor === "string") return descriptor;
+      return descriptor.message ?? descriptor.id ?? "";
+    },
+  },
+}));
+
+vi.mock("@lingui/core/macro", () => ({
+  msg: (strings: TemplateStringsArray, ...values: unknown[]) => ({
+    id: String.raw(strings, ...values),
+    message: String.raw(strings, ...values),
+  }),
+}));
+
+import { formatLocalDate, groupByDateBucket } from "../src/date-buckets";
+
+describe("formatLocalDate", () => {
+  test("formats a date as YYYY-MM-DD", () => {
+    expect(formatLocalDate(new Date(2024, 0, 5))).toBe("2024-01-05");
+  });
+
+  test("pads single-digit month and day", () => {
+    expect(formatLocalDate(new Date(2024, 2, 3))).toBe("2024-03-03");
+  });
+
+  test("handles December correctly", () => {
+    expect(formatLocalDate(new Date(2024, 11, 31))).toBe("2024-12-31");
+  });
+});
+
+describe("groupByDateBucket", () => {
+  // Pin "today" to a Wednesday: 2024-06-12
+  beforeEach(() => {
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date("2024-06-12T10:00:00"));
+  });
+
+  afterEach(() => {
+    vi.useRealTimers();
+  });
+
+  test("empty array returns empty result", () => {
+    expect(groupByDateBucket([])).toEqual([]);
+  });
+
+  test("item on today goes to 'today' bucket", () => {
+    const result = groupByDateBucket([{ date: "2024-06-12" }]);
+    expect(result).toHaveLength(1);
+    expect(result[0].key).toBe("today");
+    expect(result[0].items).toHaveLength(1);
+  });
+
+  test("item on tomorrow goes to 'tomorrow' bucket", () => {
+    const result = groupByDateBucket([{ date: "2024-06-13" }]);
+    expect(result).toHaveLength(1);
+    expect(result[0].key).toBe("tomorrow");
+  });
+
+  test("item within 6 days goes to 'this_week' bucket", () => {
+    // Today is June 12 (Wed), end of week = June 18 (Tue)
+    const result = groupByDateBucket([{ date: "2024-06-17" }]);
+    expect(result).toHaveLength(1);
+    expect(result[0].key).toBe("this_week");
+  });
+
+  test("item 7-13 days out goes to 'next_week' bucket", () => {
+    // End of week = June 18, next week ends June 25
+    const result = groupByDateBucket([{ date: "2024-06-22" }]);
+    expect(result).toHaveLength(1);
+    expect(result[0].key).toBe("next_week");
+  });
+
+  test("item 30+ days out goes to month bucket", () => {
+    const result = groupByDateBucket([{ date: "2024-08-15" }]);
+    expect(result).toHaveLength(1);
+    expect(result[0].key).toBe("month_2024-08");
+  });
+
+  test("multiple items in same bucket are grouped together", () => {
+    const result = groupByDateBucket([
+      { date: "2024-06-12", name: "a" },
+      { date: "2024-06-12", name: "b" },
+    ]);
+    expect(result).toHaveLength(1);
+    expect(result[0].key).toBe("today");
+    expect(result[0].items).toHaveLength(2);
+  });
+
+  test("items across multiple buckets are ordered by first appearance", () => {
+    const result = groupByDateBucket([
+      { date: "2024-06-13" }, // tomorrow
+      { date: "2024-06-12" }, // today
+      { date: "2024-08-01" }, // month
+    ]);
+    expect(result).toHaveLength(3);
+    expect(result[0].key).toBe("tomorrow");
+    expect(result[1].key).toBe("today");
+    expect(result[2].key).toBe("month_2024-08");
+  });
+
+  test("bucket labels are populated", () => {
+    const result = groupByDateBucket([{ date: "2024-06-12" }, { date: "2024-06-13" }]);
+    expect(result[0].label).toBeTruthy();
+    expect(result[1].label).toBeTruthy();
+  });
+});