Add welcome dashboard as default view

Replace the All Services grid as the landing view with a
Nextcloud-style welcome dashboard:

- Greeting (time-of-day), "Welcome to Your Sovereign Digital &
  Financial Life" headline, version + role meta line
- Status cards: Systems Operational, Network (LAN/WAN/hostname),
  Bitcoin sync progress with ETA, and available-updates card
- Calm drifting orb background animation (transform-only,
  disabled under prefers-reduced-motion)
- Services grid stays mounted but hidden until the user browses
  (Browse button, search, or a nav category); Dashboard nav item
  returns to the welcome view
- Move role badge and autolaunch preference out of the sidebar;
  autolaunch toggle now lives in the Systems Operational modal
- Remove LAN/WAN chip from the topbar; IPs live on the Network card

app/sovran_systemsos_web/static/css/header.css

@@ -56,49 +56,6 @@
 
 .search-box input::placeholder { color: var(--text-3); }
 
-/* ── Network chip — LAN + WAN always on one line ────────────────── */
-
-.net-chip {
-  display: flex;
-  align-items: center;
-  gap: 10px;
-  padding: 8px 17px;
-  border-radius: 99px;
-  background: var(--card);
-  border: 1px solid var(--border);
-  font-family: var(--mono);
-  font-size: 0.73rem;
-  color: var(--text-3);
-  white-space: nowrap;
-  order: 4;
-}
-
-.net-chip svg { width: 15px; height: 15px; color: var(--text-3); flex-shrink: 0; }
-.net-chip .int-wrap, .net-chip .ext-wrap { display: inline-flex; align-items: center; gap: 7px; }
-
-.net-chip .ip-label {
-  font-size: 0.6rem;
-  font-weight: 800;
-  letter-spacing: 0.08em;
-  color: var(--text-3);
-  margin-right: 7px;
-}
-
-.net-chip .ip-value {
-  color: var(--text);
-  font-weight: 600;
-  font-family: var(--mono);
-}
-
-.net-separator {
-  width: 1px;
-  height: 15px;
-  background: var(--border-strong);
-  margin: 0 3px;
-  flex-shrink: 0;
-  color: transparent;
-}
-
 .top-actions {
   display: flex;
   gap: 9px;
@@ -106,17 +63,6 @@
   order: 5;
 }
 
-/* Below 1160px the chip wraps to its own full-width topbar row —
-   it never stacks LAN over WAN and never hides the external IP. */
-@media (max-width: 1160px) {
-  .topbar { flex-wrap: wrap; row-gap: 10px; }
-  .net-chip {
-    order: 6;
-    flex-basis: 100%;
-    justify-content: center;
-  }
-}
-
 /* ── Legacy badges (still used inside dialogs) ──────────────────── */
 
 .role-badge {