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-tier.test.ts

@@ -0,0 +1,29 @@
+import { expect, test } from "bun:test";
+import {
+  backupTier,
+  retainBackups,
+} from "../src/client/state/reader/backups.ts";
+
+const now = Date.parse("2026-10-17T12:00:00.000Z");
+const daysAgo = (d: number) => new Date(now - d * 86_400_000).toISOString();
+
+test("a snapshot's tier matches the window that retains it", () => {
+  expect(backupTier(daysAgo(0), now)).toBe("daily");
+  expect(backupTier(daysAgo(6), now)).toBe("daily");
+  expect(backupTier(daysAgo(8), now)).toBe("weekly");
+  expect(backupTier(daysAgo(33), now)).toBe("weekly");
+  expect(backupTier(daysAgo(40), now)).toBe("monthly");
+  // Everything retained falls in one of the three.
+  const kept = retainBackups(
+    Array.from({ length: 200 }, (_, i) => ({
+      id: String(i),
+      at: daysAgo(i),
+      payload: {},
+    })),
+    now,
+  );
+  const tiers = kept.map((s) => backupTier(s.at, now));
+  expect(tiers.filter((t) => t === "daily").length).toBe(7);
+  expect(tiers.filter((t) => t === "weekly").length).toBe(4);
+  expect(tiers.filter((t) => t === "monthly").length).toBe(6);
+});