feat(web): iPhone PWA fixes (M1) + warm RTO redesign (M2)

M1 — PWA mechanics:
- Generate real app icons (apple-touch-icon + manifest 192/512/maskable)
  via pure-stdlib gen_icons.py; iOS uses apple-touch-icon, not manifest icons.
- viewport-fit=cover + env(safe-area-inset-*) on header/input/menu so content
  clears the notch and home indicator.
- Dynamic height pinned to the VisualViewport (height + offsetTop, re-measured
  across the keyboard animation) so the input stays above the iOS keyboard;
  100dvh fallback. Kills the squish/gap bugs in standalone mode.
- overscroll containment; flesh out manifest (scope, portrait, maskable).

M2 — visual redesign:
- Realign style.css to the warm low-glow RTO palette already used by the
  standalone pages (#0e0e0e panels, #2a1d12 borders); remove the neon
  saturated-orange borders and ~15 glow shadows.
- Reserve filled accent for one element (Send); glow only on status pulse +
  input focus. Flat warm message bubbles with tail corners.
- Reclaim the mobile header into [≡] Lyra · [status dot]; drop the redundant
  status bar (relay status now the header dot, updated in checkHealth).
- prefers-reduced-motion support; fix undefined var(--text); real light-mode tokens.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lyra/web/static/manifest.json

@@ -1,20 +1,33 @@
-{
-  "name": "Lyra Chat",
-  "short_name": "Lyra",
-  "start_url": "./index.html",
-  "display": "standalone",
-  "background_color": "#181818",
-  "theme_color": "#181818",
-  "icons": [
-    {
-      "src": "icon-192.png",
-      "sizes": "192x192",
-      "type": "image/png"
-    },
-    {
-      "src": "icon-512.png",
-      "sizes": "512x512",
-      "type": "image/png"
-    }
-  ]
-}
+{
+  "name": "Lyra",
+  "short_name": "Lyra",
+  "description": "Lyra — chat, mind, journal, and poker copilot.",
+  "start_url": "./index.html",
+  "scope": "./",
+  "display": "standalone",
+  "display_override": ["standalone", "minimal-ui"],
+  "orientation": "portrait",
+  "background_color": "#070707",
+  "theme_color": "#070707",
+  "categories": ["productivity", "utilities"],
+  "icons": [
+    {
+      "src": "icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "any"
+    },
+    {
+      "src": "icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "any"
+    },
+    {
+      "src": "icon-maskable-512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "maskable"
+    }
+  ]
+}