fix(fedimint): stop declaring 8175 — it belongs to the UI companion, not fedimintd

Declaring the Guardian UI port on the fedimint app made the orchestrator try
to publish 8175 from fedimintd, colliding with archy-fedimint-ui which
already holds it: start_container failed on every reconcile and fedimint
crash-looped (100.82.34.38). The companion's nginx pinned to 127.0.0.1 is
what actually closes that port; the gate reports it rather than fronting it.

Also: app-login page uses the sidebar's 'A' mark instead of the full
wordmark, is pinned to the small viewport so it stays centred and the
keyboard overlays rather than scrolls it, and the install-version modal
icon uses object-contain so a non-square icon is no longer cropped.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

neode-ui/src/components/InstallVersionModal.vue

@@ -2,11 +2,15 @@
   <BaseModal :show="show" title="" max-width="max-w-lg" @close="emit('close')">
     <!-- Header: app icon + "Install Bitcoin Knots/Core" -->
     <div class="flex items-center gap-4 mb-5 -mt-2">
+      <!-- object-contain, not the default fill: app icons are not all square
+           (bitcoin-knots is not), so a fixed 56x56 box distorted or cropped the
+           mark against the rounded corners. Contain plus a dark plate shows the
+           whole icon whatever its aspect ratio. -->
       <img
         v-if="app?.icon"
         :src="app.icon"
         :alt="app?.title || ''"
-        class="w-14 h-14 rounded-xl shadow-lg shrink-0"
+        class="w-14 h-14 rounded-xl shadow-lg shrink-0 object-contain bg-black/40 p-1"
       />
       <div v-else class="w-14 h-14 rounded-xl bg-white/10 flex items-center justify-center shrink-0">
         <svg class="w-7 h-7 text-white/40" fill="none" stroke="currentColor" viewBox="0 0 24 24">