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/manifest.json

@@ -4,14 +4,26 @@
     "description": "A private, real-time voice companion with personal memory.",
     "start_url": "/",
     "display": "standalone",
-    "background_color": "#08111f",
-    "theme_color": "#08111f",
+    "background_color": "#1C191F",
+    "theme_color": "#1C191F",
     "icons": [
         {
             "src": "favicon.svg",
             "sizes": "any",
             "type": "image/svg+xml",
             "purpose": "any"
+        },
+        {
+            "src": "brand/hope-icon-192.png",
+            "sizes": "192x192",
+            "type": "image/png",
+            "purpose": "any"
+        },
+        {
+            "src": "brand/hope-icon-512.png",
+            "sizes": "512x512",
+            "type": "image/png",
+            "purpose": "any maskable"
         }
     ]
 }