Install scene: fix cmd-bar overlap, swap install command

The "CLICK TO COPY" hint was absolute-positioned at top:10/right:14 of
the cmd-box, landing on top of "~/facere — bash" in the bar header.
Move the hint into the bar as a flex sibling so the title and hint
share the row cleanly without overlap.

Replace the placeholder install command with the real installer pulled
from raw.githubusercontent.com, with FACERE_GH_TOKEN as a
"contact us for demo" placeholder.

Also fix deploy/build.sh: `npm init -y` rejects the leading-dot dir
name `.build`, and the preset must be resolved by absolute path since
babel runs from the repo root.

app.jsx

@@ -434,7 +434,7 @@ function ProductSection({ bgRef, contentRef }) {
 /* ───────────────── InstallSection ───────────────── */
 function InstallSection({ bgRef, contentRef }) {
   const [copied, setCopied] = useState(false);
-  const cmd = "curl -fsSL https://facere.ai/install.sh | sh";
+  const cmd = `curl -fsSL https://raw.githubusercontent.com/ZhaoYiping789/facere-installer/main/bootstrap.sh | FACERE_GH_TOKEN="contact us for demo"`;
 
   const copy = async () => {
     try {
@@ -475,15 +475,15 @@ function InstallSection({ bgRef, contentRef }) {
             <span className="cmd-led led-amber" />
             <span className="cmd-led led-cyan" />
             <span className="cmd-title">~/facere — bash</span>
+            <span className="cmd-bar-hint">
+              {copied ? "✓ COPIED" : "CLICK TO COPY"}
+            </span>
           </div>
           <div className="cmd-body">
             <span className="cmd-prompt">$</span>
             <span className="cmd-text">{cmd}</span>
             <span className="cmd-cursor" />
           </div>
-          <div className="cmd-hint">
-            {copied ? "✓ COPIED" : "CLICK TO COPY"}
-          </div>
         </div>
 
         <a className="docs-link" href="#" onClick={(e) => e.preventDefault()}>