Navy theme from the app icon, frosted glass, and the new mark in-app

The icon's artwork is now the source of truth for the palette:

- frost-* is a navy-tinted neutral scale and accent-* is the icon's
  snowflake blue; light page #f4f7fd / sidebar #e9eff9 / border
  #dce4f1, dark page #0e1424 / sidebar #0a0f1c / surfaces #171f33.
- Surfaces are frosted glass: .card, .glass-panel, .list-group and
  .sidebar-surface are translucent with backdrop-blur/saturate, and the
  page wrapper no longer paints an opaque --page, so the fixed navy/blue
  backdrop reads through the sidebar, cards, chrome and sheets.
- The primary CTA is the icon's blue (#1d61ab in light, #59a8f7 in dark
  with ink text).
- The gate stage, fields and glows are navy/blue; viewport theme-color
  and the manifest background/theme colour are #0e1424.
- The old monochrome snowflake tile is gone from the brand: sidebar,
  header, key gate and empty state now show the real app icon (the
  install sheet already did). Decorative snowflakes stay.
- --surface-strong is finally defined (it was referenced but never
  declared, so those inputs had no fill).
- Icon URLs carry ?v=2 so browser favicon caches refetch.

Updated the contrast audit (21 pairs) and the deck-chrome token
assertions to the new theme. Verified: contrast 21/21, deck chrome
15/15, key gate 49/49, install sheet 64/64, final ux 12/12, retry
14/14, zoom 6/6, security 8/8, pwa 16/16, deck fixes 15/15.

components/ApiKeyGate.tsx

@@ -11,7 +11,6 @@ import {
   EyeOffIcon,
   MoonIcon,
   QuestionIcon,
-  SnowflakeIcon,
   SunIcon,
   XIcon,
 } from "@/components/icons";
@@ -233,12 +232,13 @@ function GateScreen() {
           transition={{ duration: 0.45, ease: [0.22, 1, 0.36, 1] }}
           className="my-auto w-full max-w-[420px] rounded-[24px] border border-[var(--gate-card-border)] bg-[var(--gate-card)] p-6 px-7 text-center shadow-[var(--shadow-gate)] sm:p-8"
         >
-          <span
+          {/* eslint-disable-next-line @next/next/no-img-element -- static app icon, no optimisation needed */}
+          <img
+            src="/icons/icon-192.png"
+            alt=""
             aria-hidden
-            className="mx-auto grid size-14 place-items-center rounded-[16px] bg-[var(--text)] text-[var(--page)] dark:border dark:border-[var(--field-border)] dark:bg-[var(--field)] dark:text-[var(--text)]"
-          >
-            <SnowflakeIcon className="size-7" />
-          </span>
+            className="mx-auto size-14 rounded-[16px] shadow-[var(--shadow-card)]"
+          />
 
           <h1 className="mt-6 text-[24px] font-medium leading-tight tracking-[-0.01em] text-[var(--text)] sm:text-[28px]">
             Connect your Ollama key

components/AppHeader.tsx

@@ -3,7 +3,7 @@
 import Link from "next/link";
 import { useEffect, useState } from "react";
 
-import { GearIcon, MenuIcon, SnowflakeIcon } from "@/components/icons";
+import { GearIcon, MenuIcon } from "@/components/icons";
 import { SettingsDialog } from "@/components/SettingsDialog";
 import { ThemeToggle } from "@/components/ThemeToggle";
 import { sidebarOpen } from "@/lib/nav";
@@ -47,12 +47,13 @@ export function AppHeader({ className, compact = false }: { className?: string;
             <MenuIcon className="size-5" />
           </button>
           <Link href="/" className="group flex items-center gap-2.5 rounded-xl px-1 py-1" aria-label="Freezmo home">
-            <span
-              aria-hidden
-              className="grid size-8 place-items-center rounded-[0.6rem] bg-[var(--text)] text-[var(--page)] transition-transform group-hover:scale-[1.04]"
-            >
-              <SnowflakeIcon className="size-[18px]" />
-            </span>
+          {/* eslint-disable-next-line @next/next/no-img-element -- static app icon, no optimisation needed */}
+          <img
+            src="/icons/icon-192.png"
+            alt=""
+            aria-hidden
+            className="size-8 rounded-[0.6rem] transition-transform group-hover:scale-[1.04]"
+          />
             <span className="flex items-baseline gap-2">
               <span className="text-[15px] font-semibold tracking-[-0.01em] text-[var(--text)]">
                 Freezmo

components/Sidebar.tsx

@@ -12,7 +12,6 @@ import {
   LayersIcon,
   MoonIcon,
   PlusIcon,
-  SnowflakeIcon,
   SunIcon,
 } from "@/components/icons";
 import { useTheme } from "@/components/ThemeToggle";
@@ -110,12 +109,13 @@ function NavContent({
           aria-label="Freezmo home"
           title="Freezmo"
         >
-          <span
+          {/* eslint-disable-next-line @next/next/no-img-element -- static app icon, no optimisation needed */}
+          <img
+            src="/icons/icon-192.png"
+            alt=""
             aria-hidden
-            className="grid size-7 shrink-0 place-items-center rounded-lg bg-[var(--text)] text-[var(--page)]"
-          >
-            <SnowflakeIcon className="size-4" />
-          </span>
+            className="size-7 shrink-0 rounded-lg shadow-[0_1px_3px_rgb(14_21_40/0.35)]"
+          />
           {!collapsed ? (
             <span className="text-[15px] font-semibold tracking-[-0.01em] text-[var(--text)]">Freezmo</span>
           ) : null}

components/ui.tsx

@@ -2,7 +2,6 @@
 
 import { forwardRef } from "react";
 
-import { SnowflakeIcon } from "@/components/icons";
 import { cn } from "@/lib/utils";
 
 type ButtonVariant = "primary" | "secondary" | "ghost" | "danger" | "success";
@@ -135,12 +134,17 @@ export function EmptyState({
 }) {
   return (
     <div className="animate-rise flex flex-col items-center px-6 py-6 text-center sm:py-24">
-      <span
-        className="mb-4 grid size-12 place-items-center rounded-2xl border border-[var(--hairline)] bg-[var(--surface-strong)] text-[var(--text-subtle)]"
-        aria-hidden
-      >
-        {icon ?? <SnowflakeIcon className="size-6" />}
-      </span>
+      {icon ? (
+        <span
+          className="mb-4 grid size-12 place-items-center rounded-2xl border border-[var(--hairline)] bg-[var(--surface-strong)] text-[var(--text-subtle)]"
+          aria-hidden
+        >
+          {icon}
+        </span>
+      ) : (
+        /* eslint-disable-next-line @next/next/no-img-element -- static app icon, no optimisation needed */
+        <img src="/icons/icon-192.png" alt="" aria-hidden className="mb-4 size-12 rounded-2xl" />
+      )}
       <h2 className="text-[17px] font-semibold tracking-[-0.01em] text-[var(--text)]">{title}</h2>
       {children ? (
         <p className="mt-2 max-w-md text-sm leading-relaxed text-[var(--text-muted)]">{children}</p>