feat: the redesigned Event Clock

The new reader app replaces the old UI: Checklist with a rail (focus
pills, Next to expire, today's dailies, pinned routines), Timeline in a
new and a classic look, Routines, Archive and a Settings area, in a
Structured (default) and a Relaxed interface. It follows the approved
Round 6 B and Round 7 mockups, corrected screen by screen with the owner.

Reader data moves to a v2 store (gacha-tracker:v2:*). Existing v1 data
is migrated on first load, a recovery copy is written first, and the v1
keys are never removed, so a rollback finds them unchanged. Redeem codes
for Genshin arrive as their own feed.

Also: live's urgency ramp, editable per theme; completion and
section-complete fireworks; a returning-user tour; the design mockups,
specs, plans, reviews and handoff record.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

test/reader-backups.test.ts

@@ -0,0 +1,35 @@
+import { expect, test } from "bun:test";
+import {
+  retainBackups,
+  type BackupSnapshot,
+} from "../src/client/state/reader/backups.ts";
+const now = Date.parse("2026-10-16T12:00:00Z"),
+  day = 86400000;
+test("400 days fold to seven daily, four weekly and six monthly real snapshots", () => {
+  const values: BackupSnapshot[] = Array.from({ length: 400 }, (_, i) => ({
+    id: String(i),
+    at: new Date(now - i * day).toISOString(),
+    payload: { day: i },
+  }));
+  const kept = retainBackups(values, now);
+  expect(kept).toHaveLength(17);
+  expect(kept.slice(0, 7).map((v) => v.id)).toEqual([
+    "0",
+    "1",
+    "2",
+    "3",
+    "4",
+    "5",
+    "6",
+  ]);
+  expect(new Set(kept.map((v) => v.id)).size).toBe(17);
+});
+test("latest per bucket wins, future and ancient snapshots are excluded", () => {
+  const values = [
+    { id: "old", at: "2026-10-16T01:00:00Z", payload: {} },
+    { id: "new", at: "2026-10-16T10:00:00Z", payload: {} },
+    { id: "future", at: "2027-01-01T00:00:00Z", payload: {} },
+    { id: "ancient", at: "2024-01-01T00:00:00Z", payload: {} },
+  ];
+  expect(retainBackups(values, now).map((v) => v.id)).toEqual(["new"]);
+});