Integrate v3 master: residence and health cluster (Batch 1)

Rewrites the six residence/health pages (visa-and-residence-explained,
student-residence-permit, where-to-apply-for-residence,
means-accommodation-address, rm-si-3-health-insurance,
healthcare-in-slovenia) to the deeper v3 English master, trilingual.
Adds backward-compatible generator support for per-page hero-image
placeholders and a "Sources and further information" section, plus
.guide-last-checked styling. Owner decisions applied (student work on
the study permit vs employment permit; sufficient means shown as
"check current"). SI/MK bodies are MSOS working translations pending
native proofread.

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

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

@@ -183,13 +183,13 @@
             <div class="article-body">
                 <div class="guide-meta">
                     <span class="guide-tag ">Applies to: students from Macedonia</span>
-                    <span class="guide-tag ">Last checked: 29 July 2026</span>
+                    <span class="guide-tag ">Last checked: 30 July 2026</span>
                     <span class="guide-tag is-frequent">Update class: Frequently changing</span>
                 </div>
 
                 <aside class="guide-box guide-box--warning">
                     <p class="guide-box-title"><i class="fas fa-triangle-exclamation" aria-hidden="true"></i>Please verify the latest information</p>
-                    <p>This page was last checked on 29 July 2026 and applies to student-work rates and tax rules in 2026. Deadlines, fees, required documents, eligibility conditions, and administrative procedures may change. Verify the information directly with the responsible institution before submitting an application or making an important decision.</p>
+                    <p>This page was last checked on 30 July 2026 and applies to student-work rates and tax rules in 2026. Deadlines, fees, required documents, eligibility conditions, and administrative procedures may change. Verify the information directly with the responsible institution before submitting an application or making an important decision.</p>
                 </aside>
 
                 <h2>Who can work</h2>