feat(preview): add server/port dropdown to address bar

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

@@ -71,7 +71,8 @@ export default function PreviewTab() {
     )
     .sort((a, b) => a.port - b.port); // sort ports ascending
 
-  const [selectedPort, setSelectedPort] = useState<number>(3000);
+  const selectedPort = usePreviewToolbarStore((s) => s.selectedPort);
+  const setSelectedPort = usePreviewToolbarStore((s) => s.setSelectedPort);
 
   // Auto-select logic if selectedPort is not in validPreviews
   useEffect(() => {
@@ -83,7 +84,7 @@ export default function PreviewTab() {
         validPreviews.find((p) => p.port === 3000) ?? validPreviews[0];
       if (fallback) setSelectedPort(fallback.port);
     }
-  }, [validPreviews, selectedPort]);
+  }, [validPreviews, selectedPort, setSelectedPort]);
 
   // Derive the currently selected preview
   const activePreview = validPreviews.find((p) => p.port === selectedPort);
@@ -232,27 +233,6 @@ export default function PreviewTab() {
 
   return (
     <div style={canvas}>
-      {validPreviews.length > 1 && (
-        <div style={portPickerWrap}>
-          {validPreviews.map((p) => (
-            <button
-              key={p.id}
-              onClick={() => setSelectedPort(p.port)}
-              style={
-                selectedPort === p.port ? portButtonActive : portButtonInactive
-              }
-            >
-              <div
-                style={p.state === "running" ? dotRunning : dotStarting}
-                className={p.state === "starting" ? "animate-pulse" : ""}
-              />
-              {p.name && p.name !== `port-${p.port}`
-                ? p.name
-                : `Port ${p.port}`}
-            </button>
-          ))}
-        </div>
-      )}
       <div
         style={{
           flex: 1,

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

@@ -7,6 +7,8 @@ interface PreviewToolbarState {
   triggerRefresh: () => void;
   currentPath: string;
   setCurrentPath: (path: string) => void;
+  selectedPort: number;
+  setSelectedPort: (port: number) => void;
 }
 
 export const usePreviewToolbarStore = create<PreviewToolbarState>((set) => ({
@@ -16,4 +18,6 @@ export const usePreviewToolbarStore = create<PreviewToolbarState>((set) => ({
   triggerRefresh: () => set((state) => ({ refreshKey: state.refreshKey + 1 })),
   currentPath: "/",
   setCurrentPath: (path) => set({ currentPath: path }),
+  selectedPort: 3000,
+  setSelectedPort: (port) => set({ selectedPort: port }),
 }));

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

@@ -1,5 +1,6 @@
 "use client";
 
+import { useEffect, useState } from "react";
 import Link from "next/link";
 import { usePathname, useParams } from "next/navigation";
 import {
@@ -8,6 +9,7 @@ import {
   Smartphone,
   RotateCw,
   ExternalLink,
+  ChevronDown,
 } from "lucide-react";
 import { usePreviewToolbarStore } from "./preview-toolbar/preview-toolbar-state";
 import { useAnatomy } from "@/components/project/use-anatomy";
@@ -94,13 +96,32 @@ function PreviewDeviceToggles() {
   const triggerRefresh = usePreviewToolbarStore((s) => s.triggerRefresh);
   const currentPath = usePreviewToolbarStore((s) => s.currentPath);
   const setCurrentPath = usePreviewToolbarStore((s) => s.setCurrentPath);
+  const selectedPort = usePreviewToolbarStore((s) => s.selectedPort);
+  const setSelectedPort = usePreviewToolbarStore((s) => s.setSelectedPort);
 
   const params = useParams();
   const projectId = params?.projectId as string;
   const { anatomy } = useAnatomy(projectId);
 
+  const [now, setNow] = useState<number>(() => Date.now());
+  useEffect(() => {
+    const id = setInterval(() => setNow(Date.now()), 10000);
+    return () => clearInterval(id);
+  }, []);
+
   const previews = anatomy?.hosting.previews ?? [];
-  const running = previews.find((p) => p.state === "running");
+  const validPreviews = previews
+    .filter(
+      (p) =>
+        p.state === "running" ||
+        (p.state === "starting" &&
+          now - new Date(p.startedAt).getTime() < 15 * 60 * 1000),
+    )
+    .sort((a, b) => a.port - b.port); // sort ports ascending
+
+  const activePreview = validPreviews.find((p) => p.port === selectedPort);
+  const running =
+    activePreview?.state === "running" ? activePreview : undefined;
   const displayUrl = running?.url ?? "";
 
   return (
@@ -159,6 +180,63 @@ function PreviewDeviceToggles() {
         }}
       />
 
+      {/* Server Selection Dropdown */}
+      <div
+        style={{
+          position: "relative",
+          display: "flex",
+          alignItems: "center",
+          flexShrink: 0,
+        }}
+      >
+        <select
+          value={selectedPort}
+          onChange={(e) => setSelectedPort(Number(e.target.value))}
+          style={{
+            background: "transparent",
+            border: "none",
+            outline: "none",
+            color: "#18181b",
+            fontSize: "0.75rem",
+            fontWeight: 500,
+            cursor: "pointer",
+            appearance: "none",
+            paddingRight: 16,
+            paddingLeft: 4,
+          }}
+        >
+          {validPreviews.map((p) => (
+            <option key={p.id} value={p.port}>
+              {p.name && p.name !== `port-${p.port}`
+                ? p.name
+                : `Port ${p.port}`}
+            </option>
+          ))}
+          {validPreviews.length === 0 && (
+            <option value={3000}>No running server</option>
+          )}
+        </select>
+        <ChevronDown
+          size={12}
+          style={{
+            color: "#71717a",
+            position: "absolute",
+            right: 2,
+            pointerEvents: "none",
+          }}
+        />
+      </div>
+
+      <div
+        style={{
+          width: 1,
+          height: 14,
+          background: "#e4e4e7",
+          margin: "0 4px",
+          flexShrink: 0,
+        }}
+      />
+
       <span
         style={{
           opacity: 0.5,
@@ -169,30 +247,59 @@ function PreviewDeviceToggles() {
       >
         /
       </span>
-      <input
+      <div
-        type="text"
-        value={currentPath === "/" ? "" : currentPath.replace(/^\//, "")}
-        onChange={(e) =>
-          setCurrentPath("/" + e.target.value.replace(/^\//, ""))
-        }
-        placeholder="path (e.g. dashboard)"
         style={{
-          background: "transparent",
-          border: "none",
-          outline: "none",
           flex: 1,
           minWidth: 0,
-          color: "#18181b",
+          position: "relative",
-          fontSize: "0.75rem",
+          display: "flex",
-          textOverflow: "ellipsis",
+          alignItems: "center",
-          fontFamily: "var(--font-mono), monospace",
         }}
-        onKeyDown={(e) => {
+      >
-          if (e.key === "Enter") {
+        <input
-            triggerRefresh(); // force reload iframe
+          type="text"
+          list="common-routes"
+          value={currentPath === "/" ? "" : currentPath.replace(/^\//, "")}
+          onChange={(e) =>
+            setCurrentPath("/" + e.target.value.replace(/^\//, ""))
           }
-        }}
+          placeholder="path (e.g. dashboard)"
-      />
+          style={{
+            background: "transparent",
+            border: "none",
+            outline: "none",
+            width: "100%",
+            color: "#18181b",
+            fontSize: "0.75rem",
+            textOverflow: "ellipsis",
+            fontFamily: "var(--font-mono), monospace",
+            paddingRight: 16,
+          }}
+          onKeyDown={(e) => {
+            if (e.key === "Enter") {
+              triggerRefresh(); // force reload iframe
+            }
+          }}
+        />
+        <datalist id="common-routes">
+          <option value="dashboard" />
+          <option value="login" />
+          <option value="signup" />
+          <option value="about" />
+          <option value="contact" />
+          <option value="pricing" />
+          <option value="settings" />
+        </datalist>
+        <ChevronDown
+          size={12}
+          style={{
+            color: "#71717a",
+            position: "absolute",
+            right: 4,
+            pointerEvents: "none",
+          }}
+        />
+      </div>
 
       <div
         style={{