brand: adopt Lightwell aperture as the Hope brand mark

- web/brand/hope-mark.svg: canonical adaptive mark (light/dark)
- web/brand/hope-logo-horizontal.svg: lockup with rounded wordmark
- web/brand/hope-icon.svg: forced-dark icon-grid-tuned source
- favicon.svg: small-size tuned aperture
- manifest + index.html: PNG icons (192/512), apple-touch-icon, theme #1C191F

web/favicon.svg

@@ -1,7 +1,13 @@
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64">
-  <rect width="64" height="64" rx="16" fill="#08111f"/>
-  <circle cx="31" cy="33" r="21" fill="none" stroke="#8ba7ff" stroke-width="2"/>
-  <ellipse cx="31" cy="33" rx="18" ry="11" fill="none" stroke="#526cae" stroke-width="1.5" transform="rotate(-18 31 33)"/>
-  <circle cx="31" cy="33" r="5" fill="#8ba7ff"/>
-  <circle cx="49" cy="18" r="5" fill="#ffb38e"/>
+  <!-- Hope favicon: Lightwell aperture, small-size tuned (strokes widened, halo dropped). -->
+  <defs>
+    <linearGradient id="core" x1="0" y1="0" x2="0" y2="1">
+      <stop offset="0" stop-color="#E3A2BC" stop-opacity="0.35"/>
+      <stop offset="0.5" stop-color="#E3A2BC" stop-opacity="1"/>
+      <stop offset="1" stop-color="#E3A2BC" stop-opacity="0.55"/>
+    </linearGradient>
+  </defs>
+  <rect width="64" height="64" rx="14" fill="#1C191F"/>
+  <rect x="19" y="8" width="26" height="48" rx="13" fill="#28232E" stroke="#BFB2C6" stroke-width="2.5"/>
+  <rect x="27.5" y="21.5" width="9" height="21" rx="4.5" fill="url(#core)"/>
 </svg>