nook: say macOS 14.2, which is what the app actually needs

The landing page, the FAQ and the downloads list still promised macOS 14. The
app cannot start there: dyld refuses it on 14.0 and 14.1 because a
CoreAudio overlay symbol its mixer uses only exists from 14.2, and the old
floor in its bundle had LaunchServices launching it on machines that could
never run it (NOOK-881).

The FAQ answer named the observation framework as the reason for 14; the
binding reason is the per-app audio tap API, which Apple shipped in 14.2. The
downloads list said 14.6+, which was already stricter than the truth.

InputHalo and Gaze still read 14.6+; their floors are their own and this
change leaves them alone.

Tests: bun test src/routes/nook (2 pass); bunx tsc --noEmit reports nothing in
the three files changed (the checkout's 286 pre-existing errors are elsewhere).

NOOK-881

src/routes/downloads.tsx

@@ -110,7 +110,7 @@ function MainDownloadsPage() {
 
               <div class="flex flex-col items-center gap-3">
                 <span class="text-subtext0 font-mono text-sm">
-                  platform: macOS (14.6+)
+                  platform: macOS (14.2+)
                 </span>
                 <Button
                   variant="download"

src/routes/nook/faq.tsx

@@ -37,9 +37,9 @@ const FAQ: FaqEntry[] = [
       "The app itself runs unprivileged. Fan control and charge limiting go through a small helper component that macOS requires to run as root for hardware access — the app installs it on first use and you approve it once with your password. The hooks live in each agent's own config directory; you can inspect or remove every file it writes."
   },
   {
-    question: "Why macOS 14 or later?",
+    question: "Why macOS 14.2 or later?",
     answer:
-      "The interface is built on Apple's current observation framework, which ships with macOS 14 (Sonoma)."
+      "The audio mixer listens to each app's own sound stream, and Apple only shipped that API in macOS 14.2 (Sonoma)."
   },
   {
     question: "Does it work offline?",
@@ -56,7 +56,7 @@ export default function NookFaqPage() {
       <EdgeCacheHeaders maxAge={300} />
       <PageHead
         title="Frequently asked questions"
-        description="Does The Nook read your prompts? Do you need a notch? Battery cost, permissions, the macOS 14 requirement, offline use — answered straight."
+        description="Does The Nook read your prompts? Do you need a notch? Battery cost, permissions, the macOS 14.2 requirement, offline use — answered straight."
         ogTitle="The Nook — FAQ"
       />
       <SubdomainHeader />

src/routes/nook/index.tsx

@@ -103,7 +103,7 @@ export default function NookLanding() {
             UI.
           </p>
           <p class="text-subtext1 mb-8 text-sm">
-            macOS 14+ · 14-day free trial · up to 3 devices
+            macOS 14.2+ · 14-day free trial · up to 3 devices
           </p>
 
           <div class="flex flex-col items-center gap-4 sm:flex-row sm:space-x-4">