feat(web): rebrand marketing site to Voculinux

Names, wordmarks, package and install references move to voculinux;
site domain to voculinux.com with renamed public assets. Layout keeps
Carbon spacing/type/motion discipline remapped to the house palette
(teal interactive, warm paper, system stacks, red reserved). Header
and footer gain Bongbetic attribution chrome linking hosted brand
assets; no brand binaries vendored. Engine copy states whisper.cpp as
guaranteed default, others as best-effort extras, remote API as
user-configured with audio leaving the machine. Nix page carries a
fork-status note (upstream flake installs Vocalinux).

Refs #24

web/scripts/render-social-assets.mjs

@@ -10,7 +10,7 @@ import { chromium } from "playwright-core";
 
 const root = join(dirname(fileURLToPath(import.meta.url)), "..");
 const pub = join(root, "public");
-const mark = join(pub, "brand/vocalinux-mark-circle.svg");
+const mark = join(pub, "brand/voculinux-mark-circle.svg");
 const chrome =
   process.env.CHROME_PATH ||
   ["/usr/bin/chromium-browser", "/usr/bin/chromium"].find(Boolean);
@@ -33,15 +33,15 @@ const skipIcons = process.env.OG_ONLY === "1";
 const sizes = [
   [16, join(pub, "favicon-16x16.png")],
   [32, join(pub, "favicon-32x32.png")],
-  [32, join(pub, "vocalinux-32x32.png")],
-  [64, join(pub, "vocalinux-64x64.png")],
+  [32, join(pub, "voculinux-32x32.png")],
+  [64, join(pub, "voculinux-64x64.png")],
   [96, join(pub, "favicon-96x96.png")],
-  [96, join(pub, "vocalinux-96x96.png")],
-  [192, join(pub, "vocalinux-192x192.png")],
+  [96, join(pub, "voculinux-96x96.png")],
+  [192, join(pub, "voculinux-192x192.png")],
   [192, join(pub, "icon-192x192.png")],
-  [512, join(pub, "vocalinux-512x512.png")],
+  [512, join(pub, "voculinux-512x512.png")],
   [512, join(pub, "icon-512x512.png")],
-  [512, join(pub, "vocalinux.png")],
+  [512, join(pub, "voculinux.png")],
 ];
 
 if (!skipIcons) {
@@ -50,8 +50,8 @@ if (!skipIcons) {
     if (dest.endsWith(".png") && !dest.includes("favicon-")) {
       const webp = dest.replace(/\.png$/i, ".webp");
       if (
-        dest.includes("vocalinux-") ||
-        dest.endsWith("/vocalinux.png")
+        dest.includes("voculinux-") ||
+        dest.endsWith("/voculinux.png")
       ) {
         toWebp(dest, webp);
       }
@@ -119,7 +119,7 @@ const ogHtml = `<!doctype html>
     <div class="copy">
       <div class="brand">
         <img src="${markData}" alt="" />
-        Vocalinux
+        Voculinux
       </div>
       <h1>Dictate locally.<br><em>In any app.</em></h1>
       <p class="lede">Hold Right Alt. Text lands in the focused window. Local engines by default.</p>
@@ -128,11 +128,11 @@ const ogHtml = `<!doctype html>
         <span>No telemetry</span>
         <span>AGPL-3.0</span>
       </div>
-      <p class="url">vocalinux.com</p>
+      <p class="url">voculinux.com</p>
     </div>
     <div class="right">
       <div class="workbench">
-        <div class="panel"><span>Vocalinux</span><span><i class="rec"></i>listening</span></div>
+        <div class="panel"><span>Voculinux</span><span><i class="rec"></i>listening</span></div>
         <div class="window">
           <div class="titlebar"><span>notes.txt</span><span class="dots" aria-hidden="true"><i></i><i></i><i class="close"></i></span></div>
           <div class="body">

web/scripts/viewport-qa.mjs

@@ -1,6 +1,6 @@
 #!/usr/bin/env node
 /**
- * Viewport QA for the Vocalinux marketing home page.
+ * Viewport QA for the Voculinux marketing home page.
  * Uses system Google Chrome via playwright-core (no browser download).
  *
  * Usage:
@@ -74,7 +74,7 @@ try {
         scrollWidth: de.scrollWidth,
         clientWidth: de.clientWidth,
         overflowX,
-        hasVocalinux: bodyText.includes("Vocalinux"),
+        hasVoculinux: bodyText.includes("Voculinux"),
         hasInstallCta: !!document.querySelector('a[href="#install"]'),
         hasGradientText: !!document.querySelector('[class*="bg-clip-text"]'),
         h1: hero ? hero.innerText.trim() : null,
@@ -128,7 +128,7 @@ try {
 
     const ok =
       !metrics.overflowX &&
-      metrics.hasVocalinux &&
+      metrics.hasVoculinux &&
       metrics.hasInstallCta &&
       !metrics.hasGradientText &&
       metrics.heroInBounds &&