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/index.html

@@ -3,10 +3,13 @@
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0, viewport-fit=cover">
-    <meta name="theme-color" content="#08111f">
+    <meta name="theme-color" content="#1C191F">
     <title>Hope · Voice companion</title>
     <link rel="manifest" href="manifest.json">
     <link rel="icon" type="image/svg+xml" href="favicon.svg">
+    <link rel="apple-touch-icon" href="brand/apple-touch-icon.png">
+    <link rel="icon" type="image/png" sizes="192x192" href="brand/hope-icon-192.png">
+    <link rel="icon" type="image/png" sizes="512x512" href="brand/hope-icon-512.png">
     <link rel="stylesheet" href="style.css">
 </head>
 <body data-mode="voice">