fix(guide,si): apply Slovenian copy corrections across Student Welcome Guide

Landing page: refine hero lead, intro and study-cities paragraphs; rename
route-generator title/labels/button (Pripravi svojo študijsko pot, Kdo ste?,
Raven študija, Kje ste trenutno?, Prikaži mojo pot) and section subtitle.

student-guide.js: relabel SI phase options and switch budget options to
'X € / mesec' with en-dash ranges + gender-inclusive wording.

Shared across all SI guide pages: rewrite 'Dobro je vedeti' box into three
paragraphs (+ CSS), change 'Nazadnje preverjeno' -> 'Posodobljeno' (30 pages),
and refine the 'preverite najnovejše informacije' warning (22 pages).
complete-student-journey: reword the 'Devet korakov' subtitle.

New route-generator state 'Prijavo sem že oddal/-a' intentionally deferred
(needs my-route.js + Google Form wiring). SI only per request.

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

css/pages/_guide.css

@@ -1062,3 +1062,5 @@
 .guide-disclaimer > i { color: #EA7317; font-size: 18px; margin-top: 2px; flex: 0 0 auto; }
 .guide-disclaimer .gd-body { font-size: 13.5px; line-height: 21px; color: #7C4A21; }
 .guide-disclaimer .gd-body strong { display: block; color: #9A3412; font-size: 14px; margin-bottom: 3px; }
+.guide-disclaimer .gd-body p { margin: 0 0 8px; }
+.guide-disclaimer .gd-body p:last-child { margin-bottom: 0; }