fix: actually strip stale SESSION_SECRET mentions from README

The gap-g-readme merge commit (57a8914) staged this fix but never
re-staged it after editing, so the merge landed with the pre-fix content —
the working tree had the correction but git didn't. No functional change,
just closing the gap between what was intended and what was committed.

frontend/public/favicon.svg

@@ -0,0 +1,69 @@
+<svg width="512" height="512" viewBox="0 0 512 512" xmlns="http://www.w3.org/2000/svg">
+  <defs>
+    <radialGradient id="bgGlow" cx="50%" cy="42%" r="65%">
+      <stop offset="0%" stop-color="#2a2040" />
+      <stop offset="55%" stop-color="#140f20" />
+      <stop offset="100%" stop-color="#0b0a10" />
+    </radialGradient>
+    <radialGradient id="ghostFill" cx="50%" cy="30%" r="75%">
+      <stop offset="0%" stop-color="#d9c8f7" stop-opacity="0.98" />
+      <stop offset="45%" stop-color="#a687e0" stop-opacity="0.95" />
+      <stop offset="100%" stop-color="#6b4fa8" stop-opacity="0.9" />
+    </radialGradient>
+    <radialGradient id="eyeGlow" cx="50%" cy="50%" r="50%">
+      <stop offset="0%" stop-color="#fdf8ff" />
+      <stop offset="100%" stop-color="#c9b6f0" />
+    </radialGradient>
+    <filter id="softBlur" x="-50%" y="-50%" width="200%" height="200%">
+      <feGaussianBlur stdDeviation="10" />
+    </filter>
+    <filter id="wideBlur" x="-80%" y="-80%" width="260%" height="260%">
+      <feGaussianBlur stdDeviation="22" />
+    </filter>
+  </defs>
+
+  <!-- background -->
+  <rect width="512" height="512" fill="url(#bgGlow)" />
+
+  <!-- faint signal arcs, spirit-radio motif -->
+  <g stroke="#9b7fd4" fill="none" opacity="0.28">
+    <path d="M 96 168 A 220 220 0 0 1 416 168" stroke-width="3" />
+    <path d="M 128 122 A 270 270 0 0 1 384 122" stroke-width="2.5" opacity="0.7" />
+  </g>
+
+  <!-- sigil ring -->
+  <circle cx="256" cy="272" r="176" stroke="#9b7fd4" stroke-width="1.5" fill="none" opacity="0.35" />
+  <circle cx="256" cy="272" r="176" stroke="#9b7fd4" stroke-width="1" fill="none" opacity="0.5"
+          stroke-dasharray="2 14" />
+
+  <!-- outer glow behind the ghost -->
+  <path
+    d="M256 108 C182 108 140 168 140 244 C140 322 172 372 196 408 C214 384 224 392 256 412
+       C288 392 298 384 316 408 C340 372 372 322 372 244 C372 168 330 108 256 108 Z"
+    fill="#9b7fd4" opacity="0.55" filter="url(#wideBlur)"
+  />
+
+  <!-- ghost body -->
+  <path
+    d="M256 116 C188 116 150 172 150 242 C150 316 180 364 202 398 C218 376 228 384 256 402
+       C284 384 294 376 310 398 C332 364 362 316 362 242 C362 172 324 116 256 116 Z"
+    fill="url(#ghostFill)" stroke="#efe6ff" stroke-width="2" opacity="0.98"
+  />
+
+  <!-- inner soft highlight -->
+  <ellipse cx="222" cy="188" rx="46" ry="60" fill="#ffffff" opacity="0.16" filter="url(#softBlur)" />
+
+  <!-- eyes -->
+  <circle cx="222" cy="230" r="15" fill="#0b0a10" />
+  <circle cx="290" cy="230" r="15" fill="#0b0a10" />
+  <circle cx="222" cy="230" r="6" fill="url(#eyeGlow)" />
+  <circle cx="290" cy="230" r="6" fill="url(#eyeGlow)" />
+
+  <!-- drifting motes -->
+  <g fill="#d9c8f7">
+    <circle cx="118" cy="330" r="4" opacity="0.85" />
+    <circle cx="140" cy="366" r="2.5" opacity="0.6" />
+    <circle cx="394" cy="322" r="3.5" opacity="0.75" />
+    <circle cx="378" cy="360" r="2" opacity="0.55" />
+  </g>
+</svg>