Landing/About/guide polish + Proxify-style category filter bar

About Us:
- Replace the appreciation photo with an Apple-style scrolling marquee that
  focal-zooms the centred photo (main.js + _about.css); heading now sits above
  the carousel; remove the "Have any questions?" FAQ CTA (EN/MK/SI).

Landing hero:
- Turn the flat blue overlay into a Proxify-style radial vignette (light centre
  over the CTA, dark edges) and raise the "Become a member" button.

Filter bar (Events & Projects / Blog / News, EN/MK/SI):
- Add a shared Proxify-style rounded pill bar with a trailing search icon that
  swaps to a search field and opens a results dropdown (thumbnail + category +
  title). New css/pages/_filterbar.css + filter-search.js, layered on top of the
  existing filter/pagination JS. Blog category icons preserved.
- Balance the News filter bar spacing between the header and the cards.

Student Welcome Guide:
- Widen the intro paragraphs, constrain the full-bleed disclaimer to a normal
  centred width, and add space before the route configurator.

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

en/projects/index.html

@@ -433,6 +433,7 @@
 <!-- END_FOOTER -->
 
     <script src="../../main.js"></script>
+    <script src="../../filter-search.js"></script>
 <link rel="stylesheet" href="/assistant.css">
 <script src="/assistant.js" defer></script>
 </body>