design: first impl of logo, still with glitch

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

@@ -144,20 +144,14 @@
   gap: 10px;
   flex-shrink: 0;
 }
+/* The live pixel-S logo renders its own self-contained SVG; this just reserves
+   its 28px slot and lets the animation's glitch/datamosh spill past the edges. */
 .brand-mark {
+  display: block;
+  flex-shrink: 0;
   width: 28px;
   height: 28px;
-  border-radius: 7px;
-  display: grid;
-  place-items: center;
-  background: var(--accent);
-  font-family: var(--font-display);
-  font-size: 20px;
-  letter-spacing: 0.02em;
-  color: white;
-  box-shadow:
-    0 6px 20px -6px color-mix(in srgb, var(--accent) 60%, black),
-    inset 0 1px 0 rgba(255, 255, 255, 0.22);
+  overflow: visible;
 }
 .brand-name {
   font-weight: 700;