feat(web): 工作区侧栏 - 账号容量进度与签到加油站

头像上方展示已用/剩余/总容量，积分开启且未领取时固定显示品牌加油站卡片，当天领取后消失。

Co-authored-by: Cursor <cursoragent@cursor.com>

web/src/lib/sidebar-checkin.ts

@@ -0,0 +1,12 @@
+export function shouldShowSidebarCheckin(input: {
+    creditsEnabled?: boolean;
+    checkinBonusMicrocredits?: number | null;
+    checkedInToday?: boolean;
+}) {
+    return Boolean(input.creditsEnabled && (input.checkinBonusMicrocredits || 0) > 0 && !input.checkedInToday);
+}
+
+export function sidebarCheckinTitle(brandName: string) {
+    const name = brandName.trim() || "影策";
+    return `${name}加油站`;
+}