Update proof-of-means to 507,43 EUR, add announcement page, European number format (EN)

- Update the residence-permit "sufficient means" figure to 507,43 EUR/month
  (Slovenian basic minimum income from 1 April 2026, source gov.si) across the
  guide, FAQ, budget note, sample parent statement and my-route tip; replaces
  the old 484,88 everywhere.
- New standalone news announcement page /<lang>/news/proof-of-means-updated-2026/
  (trilingual), published 1 August 2026, with a clickable gov.si source box and a
  hero image (Pixabay, credited). news.js now supports announcement items
  (slug + body) and shows them newest-first on the homepage and News hub; the
  image doubles as the card thumbnail. Optimised 6.98MB to 255KB.
- Switch English EUR amounts to European format (comma decimal, dot thousands):
  507,43 / 9.600 / 1.000 etc. Only euro-prefixed amounts are touched, so SI/MK
  (which use a euro suffix) are unaffected. New generator eurofmt.js.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

en/student-welcome-guide/student-transport/index.html

@@ -242,7 +242,7 @@
                 <ul class="guide-checklist">
                     <li>BicikeLJ (Ljubljana): €3 yearly or €1 weekly, unlimited trips with the first 60 minutes of each trip free. Dock within 60 minutes to keep riding for free.</li>
                     <li>MBajk (Maribor): the same platform and pricing as BicikeLJ, €3 yearly or €1 weekly, first 60 minutes free.</li>
-                    <li>Nomago Bikes (Ljubljana e-bikes): €30 student annual subscription, or €25 with an ISIC card. The first 30 minutes of each rental are free, then about €1.30 per further 30 minutes. Register in the app, add a payment method, and enter the coupon NAZAJVSOLO to buy the student subscription.</li>
+                    <li>Nomago Bikes (Ljubljana e-bikes): €30 student annual subscription, or €25 with an ISIC card. The first 30 minutes of each rental are free, then about €1,30 per further 30 minutes. Register in the app, add a payment method, and enter the coupon NAZAJVSOLO to buy the student subscription.</li>
                 </ul>
 
                 <p>An ISIC student card unlocks the cheaper Nomago rate and many other discounts, so it is worth having. Treat all prices and promotion codes as check-current information.</p>