feat(gaze): add Gaze subdomain landing page with direct download

Move the Gaze marketing home from the legacy /marketing/gaze route to
a dedicated gaze subdomain landing page (src/routes/gaze). The new page
adds a richer hero, feature highlights, and a direct .dmg download flow
that resolves a signed S3 URL via the tRPC downloads.getDownloadUrl
endpoint.

Extract the download-resolution logic into a shared, testable
downloadAsset helper (src/lib/download-asset) so current and future
subdomain landing pages (InputHalo, Lineage, …) share one code path.
The helper is pure over an injected DownloadApi + redirect sink, keeping
it unit-testable without importing solid-js / CSRF cookie code.

Replace the old marketing/gaze route with a permanent 308 redirect to
https://gaze.freno.me so existing inbound links keep resolving to the
canonical home.

Add unit tests covering the tRPC call shape, redirect sink, and error
handling.

src/routes/marketing/gaze.tsx

@@ -1,57 +1,21 @@
-import { PageHead } from "~/components/PageHead";
-import DownloadOnAppStoreDark from "~/components/icons/DownloadOnAppStoreDark";
-import { useDarkMode } from "~/context/darkMode";
-
-export default function GazeMarketing() {
-  const { isDark } = useDarkMode();
-
-  return (
-    <>
-      <PageHead
-        title="Gaze - Eye Health Reminder"
-        description="A macOS menu bar app that helps you remember to take breaks and rest your eyes. Download Gaze today."
-      />
-      <div class="relative h-full">
-        <div class="fixed inset-0 z-0 overflow-hidden brightness-75">
-          <img
-            src="/look-away.png"
-            alt="background"
-            class="h-full w-full object-cover select-none"
-            style={{
-              "pointer-events": "none"
-            }}
-          />
-        </div>
-        <div class="relative z-10 flex h-full flex-col items-center justify-center text-white backdrop-blur">
-          <div>
-            <img
-              src={
-                isDark()
-                  ? "/Gaze Exports/Gaze-iOS-Dark-1024x1024@1x.png"
-                  : "/Gaze Exports/Gaze-iOS-Default-1024x1024@1x.png"
-              }
-              alt="Gaze App Icon"
-              height={128}
-              width={128}
-              class="object-cover object-center"
-            />
-          </div>
-          <h1 class="py-4 text-center text-5xl font-bold">Gaze</h1>
-          <p class="text-text mb-8 text-xl">
-            Eye and posture health reminder for macOS
-          </p>
-          <div class="flex space-x-4">
-            <a
-              class="my-auto transition-all duration-200 ease-out active:scale-95"
-              href="https://apps.apple.com"
-              target="_blank"
-              rel="noopener noreferrer"
-            >
-              <DownloadOnAppStoreDark size={50} />
-            </a>
-          </div>
-        </div>
-      </div>
-    </>
-  );
+/**
+ * Legacy `/marketing/gaze` route — redirected (task 05) to the new Gaze
+ * subdomain landing page at `gaze.freno.me`.
+ *
+ * Kept as a permanent 308 redirect so existing inbound links keep resolving
+ * to the canonical Gaze marketing home.
+ *
+ * Implemented as a thrown `Response` (rather than `@solidjs/router`'s
+ * `redirect()`) because the target is a *cross-origin* absolute URL; throwing
+ * a `Response` from a SolidStart page component propagates as the actual HTTP
+ * response, with no router base-path rewriting.
+ */
+export default function GazeMarketingRedirect(): never {
+  throw new Response(null, {
+    status: 308,
+    headers: {
+      Location: "https://gaze.freno.me",
+      "Cache-Control": "public, max-age=86400"
+    }
+  });
 }