feat(preview): add tablet device mode with scaled frame styling

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

@@ -255,11 +255,22 @@ export default function PreviewTab() {
       >
         <div
           style={{
-            ...(deviceMode === "desktop" ? desktopFrame : mobileFrame),
+            ...(deviceMode === "desktop"
+              ? desktopFrame
+              : deviceMode === "tablet"
+                ? tabletFrame
+                : mobileFrame),
             transition: "all 0.3s ease",
+            transform:
+              deviceMode === "tablet"
+                ? "scale(0.85)"
+                : deviceMode === "mobile"
+                  ? "scale(0.95)"
+                  : "none",
+            transformOrigin: "center center",
           }}
         >
-          {deviceMode === "mobile" && <MobileChrome />}
+          {deviceMode !== "desktop" && <MobileChrome />}
 
           {iframeSrc ? (
             <iframe
@@ -273,7 +284,12 @@ export default function PreviewTab() {
               onLoad={() => bridge?.notifyPreviewIframeLoaded()}
               style={{
                 ...iframeStyle,
-                borderRadius: deviceMode === "mobile" ? 44 : 0,
+                borderRadius:
+                  deviceMode === "mobile"
+                    ? 44
+                    : deviceMode === "tablet"
+                      ? 28
+                      : 0,
               }}
               {...(sandboxIframe(iframeSrc, origin)
                 ? { sandbox: SAME_ORIGIN_SANDBOX }
@@ -283,7 +299,9 @@ export default function PreviewTab() {
             <div style={loaderWrap}>{emptyContent}</div>
           )}
 
-          {deviceMode === "mobile" && <div style={homeIndicator} aria-hidden />}
+          {deviceMode !== "desktop" && (
+            <div style={homeIndicator} aria-hidden />
+          )}
         </div>
       </div>
     </div>
@@ -566,6 +584,21 @@ const desktopFrame: React.CSSProperties = {
     "0 1px 2px rgba(26, 26, 26, 0.04), 0 12px 40px rgba(26, 26, 26, 0.07), inset 0 1px 0 rgba(255, 255, 255, 0.85)",
 };
 
+const tabletFrame: React.CSSProperties = {
+  position: "relative",
+  width: 768,
+  height: 1024,
+  flexShrink: 0,
+  borderRadius: 40,
+  overflow: "hidden",
+  background: "#000",
+  border: "14px solid #1a1a1a",
+  boxShadow:
+    "0 0 0 1px rgba(255,255,255,0.1) inset, 0 24px 60px rgba(26, 26, 26, 0.15)",
+  display: "flex",
+  flexDirection: "column",
+};
+
 const mobileFrame: React.CSSProperties = {
   position: "relative",
   width: 390,

vibn-frontend/components/project/preview-toolbar/preview-toolbar-state.ts

@@ -1,8 +1,8 @@
 import { create } from "zustand";
 
 interface PreviewToolbarState {
-  deviceMode: "desktop" | "mobile";
-  setDeviceMode: (mode: "desktop" | "mobile") => void;
+  deviceMode: "desktop" | "tablet" | "mobile";
+  setDeviceMode: (mode: "desktop" | "tablet" | "mobile") => void;
   refreshKey: number;
   triggerRefresh: () => void;
 }

vibn-frontend/components/project/project-icon-rail.tsx

@@ -2,7 +2,13 @@
 
 import Link from "next/link";
 import { usePathname, useParams } from "next/navigation";
-import { Monitor, Smartphone, RotateCw, ExternalLink } from "lucide-react";
+import {
+  Monitor,
+  Tablet,
+  Smartphone,
+  RotateCw,
+  ExternalLink,
+} from "lucide-react";
 import { usePreviewToolbarStore } from "./preview-toolbar/preview-toolbar-state";
 import { useAnatomy } from "@/components/project/use-anatomy";
 
@@ -182,7 +188,12 @@ function PreviewDeviceToggles() {
 
       {/* Device Toggles Inside the Address Bar */}
       <div
-        style={{ display: "flex", gap: 2, alignItems: "center", flexShrink: 0 }}
+        style={{
+          display: "flex",
+          gap: 2,
+          alignItems: "center",
+          marginRight: 4,
+        }}
       >
         <button
           onClick={() => setDeviceMode("desktop")}
@@ -203,6 +214,25 @@ function PreviewDeviceToggles() {
         >
           <Monitor size={12} />
         </button>
+        <button
+          onClick={() => setDeviceMode("tablet")}
+          style={{
+            display: "flex",
+            alignItems: "center",
+            justifyContent: "center",
+            width: 24,
+            height: 24,
+            borderRadius: 4,
+            border: "none",
+            cursor: "pointer",
+            transition: "all 0.15s",
+            background: deviceMode === "tablet" ? "#e4e4e7" : "transparent",
+            color: deviceMode === "tablet" ? "#18181b" : "#71717a",
+          }}
+          title="Tablet view"
+        >
+          <Tablet size={12} />
+        </button>
         <button
           onClick={() => setDeviceMode("mobile")}
           style={{
@@ -259,10 +289,12 @@ function PreviewDeviceToggles() {
 }
 
 const bar: React.CSSProperties = {
+  display: "flex",
+  flexDirection: "row",
   alignItems: "center",
   flex: 1,
   minWidth: 0,
-  height: "100%",
+  height: "56px", // Explicitly set height
   padding: "0 16px",
   gap: 12,
   boxSizing: "border-box",