v0.5.2: offline report + tab UI + persist race fix

- New: Offline earnings report dialog (welcome back popup with gain/duration/rate/progress)
  - src/lib/game/offlineReport.ts: module-level store + custom event
  - src/components/game/OfflineReportDialog.tsx: Radix Dialog UI
  - gameStore.init: setPendingOfflineReport before set()
- Fix: useGameLoop waits for persist.hasHydrated() before init
  - Root cause: Zustand persist rehydrate is async (Promise.resolve wrapper)
  - Before fix: init read INITIAL_STATE (lastTick=undefined), skipped offline branch
  - After fix: init waits for rehydrate, correctly reads saved lastTick
- UI: Tab bar redesign with per-tab accent colors + flex-col layout
- Version: v0.5 -> v0.5.2

src/store/gameStore.ts

@@ -66,6 +66,7 @@ import {
   type BeaconDailyChallenge,
   type BeaconDailyProgress,
 } from "@/lib/game/beacon";
+import { setPendingOfflineReport } from "@/lib/game/offlineReport";
 
 interface GameActions {
   // 生命周期
@@ -229,8 +230,22 @@ export const useGameStore = create<Store>()(
           const cap = 8 * 3600;
           const secs = Math.min(elapsed, cap);
           const gain = s.crystalsPerSec * secs * s.offlineEff;
+          const crystalsBefore = s.crystals;
+          const crystalsAfter = Math.min(s.crystalCap, s.crystals + gain);
+          // 设置离线报告（v0.5.2）：通知 UI 弹出"欢迎回来"对话框
+          setPendingOfflineReport({
+            elapsedSec: secs,
+            rawElapsedSec: elapsed,
+            gain: crystalsAfter - crystalsBefore,
+            rate: s.crystalsPerSec,
+            eff: s.offlineEff,
+            capped: elapsed > cap,
+            crystalsBefore,
+            crystalsAfter,
+            crystalCap: s.crystalCap,
+          });
           set({
-            crystals: Math.min(s.crystalCap, s.crystals + gain),
+            crystals: crystalsAfter,
             lastTick: now,
             activePuzzle,
             achievements,