FIX: Triệt để 2 lỗi treo Lưu/Đơn hàng - sửa semicolon order-store.js + revert quote-ui.js về stable

FIX: Đơn hàng button alert -> graceful fallback (same as Lưu button)

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Fix v8: retry mechanism + try-catch guard cho nút Lưu, fix treo 'Đang tải module đơn hàng'

Khôi phục 100% về commit 30b624b1

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Update quote-ui.js v7.1 - add retry mechanism for save and order buttons, plus DOM/localStorage fallback

Restore quote-ui.js v7 from Vaistudio reference - working version (save button always visible, no checkout-done-btn class)

🔥 PERMANENT FIX: "đang tải module đơn hàng" freeze — Quote UI v8 eliminates button race condition, adds retry + fallback save

Restore commit 30b624b1 - batch 1/171

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