fix: streamline result UI — wallet button, clickable QR, autofill fix

- Replace "Link kopieren" + "QR speichern" with "In Wallet öffnen" button
- QR code clickable to save as PNG with subtle hint text
- Fix chromium autofill overriding dark input backgrounds
- Center button text and remove underline on link-buttons

i18n.js

@@ -17,9 +17,9 @@ var I18n = (function () {
       label_timer: 'Zahlungsfrist in Minuten (optional)',
       placeholder_timer: 'z.B. 30',
       btn_generate: 'Zahlungsanforderung erstellen',
-      btn_copy_link: 'Link kopieren',
+      btn_open_wallet: 'In Wallet öffnen',
       btn_copy_addr: 'Adresse kopieren',
-      btn_download_qr: 'QR speichern',
+      qr_hint: 'Klick auf QR zum Speichern',
       footer: 'Open Source &middot; Kein Backend &middot; Kein KYC &middot; <a href="https://gitea.schmidt.eco/schmidt1024/xmrpay.link" target="_blank">Source</a>',
       label_share_link: 'Teilbarer Link',
       btn_new_request: 'Neue Zahlungsanforderung',
@@ -38,9 +38,9 @@ var I18n = (function () {
       label_timer: 'Payment deadline in minutes (optional)',
       placeholder_timer: 'e.g. 30',
       btn_generate: 'Create payment request',
-      btn_copy_link: 'Copy link',
+      btn_open_wallet: 'Open in wallet',
       btn_copy_addr: 'Copy address',
-      btn_download_qr: 'Save QR',
+      qr_hint: 'Click QR to save',
       footer: 'Open Source &middot; No Backend &middot; No KYC &middot; <a href="https://gitea.schmidt.eco/schmidt1024/xmrpay.link" target="_blank">Source</a>',
       label_share_link: 'Shareable link',
       btn_new_request: 'New payment request',