fix(ui): remove over-polling from plan view to prevent infinite loops

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

@@ -104,9 +104,9 @@ const SECTIONS: SectionDef[] = [
   },
   {
     key: "tasks",
-    label: "Tasks",
+    label: "Features",
     icon: ListTodo,
-    blurb: "What needs to happen next.",
+    blurb: "High-level capabilities to be delegated to the AI.",
   },
   {
     key: "decisions",
@@ -155,7 +155,9 @@ export default function PlanTab() {
 
   useEffect(() => {
     load();
-    const intervalId = setInterval(load, 5000);
+    // Only poll the plan API periodically if we aren't currently editing or saving
+    // something, otherwise we risk overwriting user input or causing layout thrashing.
+    const intervalId = setInterval(load, 15000); // Backed off from 5s to 15s to reduce API spam
     return () => clearInterval(intervalId);
   }, [load]);
 
@@ -1205,7 +1207,7 @@ function TasksPanel({
   return (
     <div>
       <div style={visionHeaderRow}>
-        <h3 style={panelTitle}>Tasks</h3>
+        <h3 style={panelTitle}>Features</h3>
         <button
           onClick={() => {
             setCreating(true);
@@ -1213,7 +1215,7 @@ function TasksPanel({
           }}
           style={primaryBtn}
         >
-          <Plus size={13} /> New task
+          <Plus size={13} /> New Feature
         </button>
       </div>
 
@@ -1241,7 +1243,7 @@ function TasksPanel({
             <div style={{ ...emptyBox, marginTop: 0 }}>
               {tasks.length === 0 ? (
                 <>
-                  No tasks yet.
+                  No features defined yet.
                   <span
                     style={{
                       display: "block",
@@ -1250,11 +1252,11 @@ function TasksPanel({
                       fontSize: "0.8rem",
                     }}
                   >
-                    Ask the AI to break down your first feature — it will create
-                    scoped tasks automatically.
+                    Ask the AI to break down your objective — it will create
+                    scoped features automatically.
                   </span>
                   <span style={promptNudge}>
-                    Try: &quot;Add user authentication to my app&quot;
+                    Try: &quot;Draft the features for this app&quot;
                   </span>
                 </>
               ) : (
@@ -1465,7 +1467,7 @@ function TaskDetail({
           onClick={async () => {
             if (
               !confirm(
-                `Delegate "${task.title}" to an autonomous agent? It will execute this task in the background and commit the results.`,
+                `Delegate feature "${task.title}" to an autonomous agent? It will execute this in the background, test it, and deploy.`,
               )
             )
               return;