hermes: tighter viewBox + bump sidebar strip icon size 20→26

Two tweaks so the mark reads at sidebar size.

- addon.json/mark.svg (and every mirror of mark.svg across the sites):
  rebuild with ZERO padding around the content bbox so the icon fills
  the slot vertically — before it was centred in a square viewBox that
  wasted ~45% of pixels. Version bumped to 0.2.5 so Theseus re-seeds.
- quicklinks.html: .icon svg, .icon img goes from 20×20 to 26×26
  (container stays 34×34; same breathing room, bigger glyph). Ships
  with the next Theseus release — can't be hot-patched into the asar.

Deploy state: site-hermes-x is live on the VPS and in bns/hermes.x/ via
the silentmode-sia-sync systemd timer, which was extended to include
hermes-x alongside sirius-x and bergamot. Future rsyncs of site-hermes-x/
to the VPS auto-sync to Sia within 5 minutes.

quicklinks.html

@@ -31,7 +31,7 @@
   .icon.dragging { opacity: .4; }
   .icon.dropbefore { box-shadow: inset 0 2px 0 var(--acid); }
   .icon.dropafter { box-shadow: inset 0 -2px 0 var(--acid); }
-  .icon svg, .icon img { width: 20px; height: 20px; display: block; }
+  .icon svg, .icon img { width: 26px; height: 26px; display: block; }
   .icon.letter { font: 600 13px/1 system-ui, sans-serif; color: var(--mut); }
   .icon .tt { position: absolute; left: 44px; top: 50%; transform: translateY(-50%);
               background: var(--bg); color: var(--ink); padding: 4px 8px; border-radius: 6px;