fix(mesh): Reticulum garbage-text + reconnect churn + signal bars + node naming/HTTPS

- reticulum.rs: send_text_msg was lossy-UTF8-mangling binary CBOR control
  envelopes (ReadReceipt etc.) before sending as LXMF text; base64-encode
  with a marker instead, decoded losslessly on receive.
- typed_messages.rs: mesh.send-read-receipt fired automatically on every
  chat view with no is_archy_peer gate, so viewing a message from a stock
  (non-archy) LXMF peer auto-sent it an undecodable control envelope,
  surfacing as garbage text right after whatever it just sent. Now a no-op
  for non-archy peers.
- mesh/listener/mod.rs: RX_STALL_TIMEOUT was 300s and forced a full
  auto-detect reconnect on any otherwise-healthy but quiet mesh link
  (visible as "Connecting..." flapping); this also wiped Reticulum's
  in-memory peer-address table every cycle, breaking messaging with peers
  who hadn't re-announced in the window. Bumped to 1800s.
- reticulum.rs: persist the peer prefix/dest-hash/display-name table to
  disk so a restart doesn't force every peer back to "Anonymous Peer"
  until they re-announce.
- decode.rs/frames.rs: Meshcore was discarding the SNR its wire format
  carries; wire it onto the peer record. Mesh.vue's signalBars() now falls
  back to SNR-based bars when RSSI is unavailable (always true for
  Meshcore); Reticulum has neither and correctly stays at 0/"no data".
- system/handlers.rs, dispatcher.rs: new system.get-hostname RPC + cert
  regeneration (with a proper SAN) whenever server.set-name changes the
  hostname, so HTTPS doesn't add a mismatch warning on top of the
  self-signed one after a rename.
- AccountInfoSection.vue: surface the mDNS hostname + http/https links in
  Settings (HTTPS needed for mic/camera secure-context features) — never
  forced, both keep working.
- build-auto-installer-iso.sh: ship avahi-daemon so .local names actually
  resolve on the LAN, and give the self-signed cert a real SAN instead of
  a bare CN, both at image-build and install-time-fallback.
- Mesh.vue/MediaLightbox.vue/mesh-styles.css: mic/attach-stack no longer
  closes on a plain hover-past; mesh images open in the shared lightbox
  and have a real download button; lightbox close button moves to
  bottom-center on mobile instead of under the status bar; mesh device
  panel gets the same height/padding as its sibling tabs.

Verified: 108/108 mesh unit tests, deployed + confirmed healthy on
.116/.198/.228 (matching binary hash across all three), live Reticulum
messaging confirmed working end-to-end post-deploy.

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

neode-ui/src/views/mesh/mesh-styles.css

@@ -341,9 +341,18 @@
 .mesh-typed-coordinate-link { display: inline-block; font-size: 0.75rem; color: #3b82f6; margin-top: 4px; text-decoration: underline; }
 .typed-block_header { border-left: 3px solid #a855f7; }
 .mesh-typed-block { display: flex; align-items: center; gap: 4px; color: #a855f7; font-size: 0.8rem; }
-.mesh-typed-content-preview { max-width: 220px; max-height: 220px; border-radius: 10px; display: block; }
+.mesh-typed-content-preview { max-width: 220px; max-height: 220px; border-radius: 10px; display: block; cursor: pointer; }
 .mesh-typed-content-thumb { opacity: 0.85; filter: blur(0.5px); margin-bottom: 6px; }
 .mesh-typed-content-audio { width: 220px; max-width: 100%; display: block; }
+.mesh-typed-content-image-wrap { position: relative; display: inline-block; }
+.mesh-typed-content-download-btn {
+  position: absolute; bottom: 6px; right: 6px; width: 1.75rem; height: 1.75rem;
+  border-radius: 50%; border: 1px solid rgba(255,255,255,0.15);
+  background: rgba(0,0,0,0.55); color: rgba(255,255,255,0.85); font-size: 0.85rem;
+  display: flex; align-items: center; justify-content: center; cursor: pointer;
+  backdrop-filter: blur(6px);
+}
+.mesh-typed-content-download-btn:hover { background: rgba(0,0,0,0.75); color: #fff; }
 .mesh-tab-bar { display: flex; gap: 2px; background: rgba(0,0,0,0.3); border-radius: 10px; padding: 3px; flex-shrink: 0; }
 .mesh-tab { flex: 1; padding: 8px 12px; border: none; background: transparent; color: rgba(255,255,255,0.5); font-size: 0.82rem; font-weight: 500; border-radius: 8px; cursor: pointer; transition: all 0.2s ease; display: flex; align-items: center; justify-content: center; gap: 6px; }
 .mesh-tab:hover { color: rgba(255,255,255,0.8); background: rgba(255,255,255,0.05); }
@@ -368,7 +377,7 @@
 .mesh-assistant-addkey input { flex: 1; min-width: 0; }
 .mesh-panel-title { font-size: 1rem; font-weight: 700; color: rgba(255,255,255,0.95); margin: 0; }
 .mesh-panel-sub { font-size: 0.8rem; color: rgba(255,255,255,0.45); margin: -4px 0 0; }
-.mesh-device-panel { display: flex; flex-direction: column; gap: 12px; }
+.mesh-device-panel { padding: 16px; display: flex; flex-direction: column; gap: 12px; flex: 1; min-height: 0; overflow-y: auto; }
 .mesh-device-panel-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
 .mesh-device-panel-actions { display: flex; flex-direction: column; gap: 6px; padding-top: 4px; border-top: 1px solid rgba(255,255,255,0.08); }
 .mesh-device-reboot-btn { align-self: flex-start; padding: 8px 16px; font-size: 0.85rem; }