design: implement the actual SoftLAN wordmark

crates/lanspread-tauri-deno-ts/src/styles/launcher.css

@@ -154,10 +154,15 @@
   overflow: visible;
 }
 .brand-name {
+  font-family: var(--font-ui);
   font-weight: 700;
   font-size: 15px;
-  letter-spacing: -0.005em;
-  color: var(--t-1);
+  letter-spacing: -0.01em;
+  color: var(--t-1); /* "Soft" — #e6edf3 on dark UI */
+}
+/* "LAN" is always the accent (per the logo wordmark spec). */
+.brand-name-lan {
+  color: var(--accent);
 }
 
 /* Peer count chip in brand area */