feat(ui): hardcode visual preview tab to primary frontend port 3000

vibn-frontend/app/[workspace]/project/[projectId]/(home)/preview/page.tsx

@@ -25,9 +25,9 @@ export default function PreviewTab() {
   const { anatomy, loading } = useAnatomy(projectId, { pollMs: 0 });
 
   const previews = anatomy?.hosting.previews ?? [];
-  const options = previews.filter((p) => p.url);
+  // Find the port 3000 preview if it exists, otherwise fall back to null
+  const primaryPreview = previews.find(p => p.port === 3000);
 
-  const [selectedUrl, setSelectedUrl] = useState<string | null>(null);
   const [iframeSrc, setIframeSrc] = useState<string | null>(null);
   const iframeDomRef = useRef<HTMLIFrameElement | null>(null);
   const bridge = usePreviewBridge();
@@ -35,16 +35,9 @@ export default function PreviewTab() {
 
   const deviceMode = usePreviewToolbarStore((s) => s.deviceMode);
 
-  // Auto-select first preview on load
-  useEffect(() => {
-    if (!selectedUrl && options.length > 0) {
-      setSelectedUrl(options[0].url);
-    }
-  }, [options, selectedUrl]);
-
   useLayoutEffect(() => {
-    setIframeSrc(selectedUrl ?? null);
-  }, [selectedUrl]);
+    setIframeSrc(primaryPreview?.url ?? null);
+  }, [primaryPreview?.url]);
 
   useEffect(() => {
     if (!bridge || !iframeSrc || !iframeDomRef.current) return;
@@ -53,23 +46,6 @@ export default function PreviewTab() {
 
   return (
     <div style={canvas}>
-      <div style={toolbar}>
-        {options.length > 1 && (
-          <select
-            value={selectedUrl ?? ""}
-            onChange={(e) => setSelectedUrl(e.target.value)}
-            style={select}
-          >
-            {options.map((p) => (
-              <option key={p.id} value={p.url}>
-                {p.name} :{p.port} — {p.state}
-                {p.command ? ` (${p.command.slice(0, 60)})` : ""}
-              </option>
-            ))}
-          </select>
-        )}
-      </div>
-
       <div
         style={{
           flex: 1,
@@ -101,7 +77,7 @@ export default function PreviewTab() {
               title="Preview"
               ref={(el) => {
                 iframeDomRef.current = el;
-                bridge?.registerPreviewIframe(el, iframeSrc);
+                if (el) bridge?.registerPreviewIframe(el, iframeSrc);
               }}
               onLoad={() => bridge?.notifyPreviewIframeLoaded()}
               style={{
@@ -114,7 +90,8 @@ export default function PreviewTab() {
             />
           ) : (
             <div style={loaderWrap}>
-              <p style={emptyText}>No preview available</p>
+              <p style={emptyText}>Preview not running on port 3000.</p>
+              <p style={{...emptyText, fontSize: '0.75rem', marginTop: 8}}>Ask the AI to start the dev server.</p>
             </div>
           )}
 
@@ -137,25 +114,6 @@ const canvas: React.CSSProperties = {
   background: "linear-gradient(165deg, #faf8f5 0%, #f4f0ea 42%, #ebe7df 100%)",
 };
 
-const toolbar: React.CSSProperties = {
-  display: "flex",
-  gap: 8,
-  marginBottom: 10,
-  flexWrap: "wrap",
-};
-
-const select: React.CSSProperties = {
-  flex: 1,
-  maxWidth: 480,
-  padding: "6px 10px",
-  borderRadius: 8,
-  border: "1px solid rgba(26, 26, 26, 0.12)",
-  background: "rgba(255,255,255,0.85)",
-  fontSize: "0.8rem",
-  fontFamily: "inherit",
-  color: "#1a1a1a",
-};
-
 const desktopFrame: React.CSSProperties = {
   flex: 1,
   width: "100%",
@@ -176,135 +134,77 @@ const mobileFrame: React.CSSProperties = {
   height: 844,
   flexShrink: 0,
   borderRadius: 56,
-  padding: 12,
-  background: "linear-gradient(160deg, #2a2a2c 0%, #1a1a1c 50%, #0e0e10 100%)",
+  overflow: "hidden",
+  background: "#000",
+  border: "14px solid #1a1a1a",
   boxShadow:
-    "0 0 0 1px rgba(255,255,255,0.04) inset, 0 0 0 2px #000 inset, 0 28px 60px -12px rgba(0,0,0,0.45), 0 8px 20px -8px rgba(0,0,0,0.35)",
+    "0 0 0 1px rgba(255,255,255,0.1) inset, 0 24px 60px rgba(26, 26, 26, 0.15)",
   display: "flex",
   flexDirection: "column",
-  overflow: "hidden",
 };
 
-const homeIndicator: React.CSSProperties = {
-  position: "absolute",
-  left: "50%",
-  bottom: 20,
-  transform: "translateX(-50%)",
-  width: 134,
-  height: 5,
-  background: "#1a1916",
-  borderRadius: 999,
-  opacity: 0.85,
-  pointerEvents: "none",
-  zIndex: 10,
-};
-
-function MobileChrome() {
-  return (
-    <>
-      <div
-        style={{
-          position: "absolute",
-          top: 22,
-          left: "50%",
-          transform: "translateX(-50%)",
-          width: 124,
-          height: 36,
-          background: "#000",
-          borderRadius: 999,
-          zIndex: 15,
-        }}
-      />
-      <div
-        style={{
-          position: "absolute",
-          top: 12,
-          left: 12,
-          right: 12,
-          height: 47,
-          padding: "18px 26px 0",
-          display: "flex",
-          alignItems: "flex-start",
-          justifyContent: "space-between",
-          fontSize: 15,
-          fontWeight: 600,
-          letterSpacing: "-0.01em",
-          color: "#1a1916",
-          pointerEvents: "none",
-          zIndex: 10,
-        }}
-      >
-        <span>9:41</span>
-        <span style={{ display: "inline-flex", alignItems: "center", gap: 6 }}>
-          <svg
-            viewBox="0 0 17 11"
-            style={{ width: 17, height: 11, fill: "currentColor" }}
-            aria-hidden
-          >
-            <rect x="0" y="7" width="3" height="4" rx="0.6" />
-            <rect x="4" y="5" width="3" height="6" rx="0.6" />
-            <rect x="8" y="3" width="3" height="8" rx="0.6" />
-            <rect x="12" y="0" width="3" height="11" rx="0.6" />
-          </svg>
-          <svg
-            viewBox="0 0 17 11"
-            style={{ width: 17, height: 11, fill: "currentColor" }}
-            aria-hidden
-          >
-            <path d="M8.5 1.5C5.5 1.5 2.7 2.6 0.5 4.6L2 6.1C3.8 4.5 6.1 3.6 8.5 3.6c2.4 0 4.7 0.9 6.5 2.5l1.5-1.5c-2.2-2-5-3.1-8-3.1zM3.5 7.6L5 9.1c1-0.9 2.2-1.4 3.5-1.4 1.3 0 2.5 0.5 3.5 1.4l1.5-1.5c-1.4-1.3-3.1-2-5-2-1.9 0-3.6 0.7-5 2zM6.5 10.6l2 2 2-2c-0.5-0.5-1.2-0.8-2-0.8s-1.5 0.3-2 0.8z" />
-          </svg>
-          <svg
-            viewBox="0 0 25 11"
-            style={{ width: 25, height: 11, fill: "currentColor" }}
-            aria-hidden
-          >
-            <rect
-              x="0.5"
-              y="0.5"
-              width="21"
-              height="10"
-              rx="2.5"
-              fill="none"
-              stroke="currentColor"
-              strokeOpacity="0.45"
-            />
-            <rect
-              x="22"
-              y="3.5"
-              width="1.5"
-              height="4"
-              rx="0.4"
-              fill="currentColor"
-              fillOpacity="0.45"
-            />
-            <rect x="2" y="2" width="18" height="7" rx="1.4" />
-          </svg>
-        </span>
-      </div>
-    </>
-  );
-}
-
 const iframeStyle: React.CSSProperties = {
   flex: 1,
   width: "100%",
-  minHeight: 0,
+  height: "100%",
   border: "none",
-  background: "#fcfcfb",
-  display: "block",
+  background: "#fff",
+  pointerEvents: "auto",
 };
 
 const loaderWrap: React.CSSProperties = {
   flex: 1,
   display: "flex",
+  flexDirection: "column",
   alignItems: "center",
   justifyContent: "center",
-  minHeight: 200,
-  background: "#fcfcfb",
+  background: "#fff",
 };
 
 const emptyText: React.CSSProperties = {
+  margin: 0,
   fontSize: "0.85rem",
-  color: "#a09a90",
-  fontFamily: '"Outfit", "Inter", ui-sans-serif, sans-serif',
+  color: "#a1a1aa",
+};
+
+function MobileChrome() {
+  return (
+    <div style={notchWrap}>
+      <div style={notch} />
+    </div>
+  );
+}
+
+const notchWrap: React.CSSProperties = {
+  position: "absolute",
+  top: 0,
+  left: 0,
+  right: 0,
+  height: 32,
+  display: "flex",
+  justifyContent: "center",
+  zIndex: 10,
+  pointerEvents: "none",
+};
+
+const notch: React.CSSProperties = {
+  width: 120,
+  height: 30,
+  background: "#1a1a1a",
+  borderBottomLeftRadius: 20,
+  borderBottomRightRadius: 20,
+};
+
+const homeIndicator: React.CSSProperties = {
+  position: "absolute",
+  bottom: 8,
+  left: "50%",
+  transform: "translateX(-50%)",
+  width: 140,
+  height: 5,
+  borderRadius: 10,
+  background: "rgba(255, 255, 255, 0.4)",
+  mixBlendMode: "difference",
+  zIndex: 10,
+  pointerEvents: "none",
 };