Late-July polish

A round of smaller improvements that shipped alongside the milestone features:

• Greetings that speak Czech and Slovak — storefront greetings now address customers in the grammatical vocative ("Ahoj Petro", not "Ahoj Petra"), with an extensive declension engine covering female and male first names. The same engine powers name-day detection for the name-day bonus.
• Cart nudge placement control — the in-cart redeem nudge can now insert at the top or bottom of your cart drawer and cart page independently, so it fits themes that keep totals or shipping bars in a fixed spot.
• Referral links respect cookie consent — when your shop's cookie banner requires consent, Charm waits for the visitor's decision (via Shopify's native Customer Privacy signal) before remembering a referral visit. No setting needed — and as before, Charm sets no tracking cookies at all.
• Referral reward fixes — discount-type referrer rewards mint reliably on first use and their texts are fully localized across all 29 languages.
• Join screen polish — the consent checkbox and join card got a visual refresh for tighter, clearer opt-in. Visitors who haven't joined yet also no longer see a member-style points balance anywhere in the widget — the join gate now shows the program's section navigation (rewards, referrals, VIP tiers) instead of a wall of earning rules.
• Tidier program overview — earning rules with long milestone ladders now collapse to a single line with a "+N more rewards" hint instead of filling the card.
• Security hardening — support-chat authentication moved to short-lived, shop-scoped tokens.