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/projects/humanitarian-tournament-in-maribor/index.html

@@ -174,7 +174,7 @@
             <header class="article-header">
                 <p class="article-publish-date">Published on April 5, 2025</p>
                 <h1>Humanitarian Sports Tournament: Playing with Heart, Together for Kočani</h1>
-                <p class="article-subtitle">Over 200 students gathered in Maribor, raising €1,000 through sport to support families hit by the Kočani tragedy.</p>
+                <p class="article-subtitle">Over 200 students gathered in Maribor, raising €1.000 through sport to support families hit by the Kočani tragedy.</p>
             </header>
 
             <figure class="article-main-image">
@@ -223,7 +223,7 @@
 
                 <h2>The humanitarian impact</h2>
 
-                <p>The most important result was not on the scoreboard but in the donations box. Together, we raised €1,010, which was split between two Macedonian families whose children were undergoing treatment in Slovenia. It was not just money. It was a message that they were not alone, that the student community stood with them during the hardest of times.</p>
+                <p>The most important result was not on the scoreboard but in the donations box. Together, we raised €1.010, which was split between two Macedonian families whose children were undergoing treatment in Slovenia. It was not just money. It was a message that they were not alone, that the student community stood with them during the hardest of times.</p>
 
                 <figure class="article-inline-image">
                     <img src="../../../images/maribor-tournament-7.png" alt="High-fives, trophies, and smiles, celebrating victory on and off the court.">