diff --git a/apps/web/src/components/ChatView.browser.tsx b/apps/web/src/components/ChatView.browser.tsx
index 24099fc7f6497972b4b20f2b0a77890d77f798bf..1d9108aab94e90b3d9296e41c7e7b226becdef31 100644
--- a/apps/web/src/components/ChatView.browser.tsx
+++ b/apps/web/src/components/ChatView.browser.tsx
@@ -874,7 +874,7 @@ async function expectComposerActionsContained(): Promise<void> {
 }
 
 async function waitForInteractionModeButton(
-  expectedLabel: "Chat" | "Plan",
+  expectedLabel: "Build" | "Plan",
 ): Promise<HTMLButtonElement> {
   return waitForElement(
     () =>
@@ -2111,7 +2111,7 @@ describe("ChatView timeline estimator parity (full app)", () => {
     });
 
     try {
-      const initialModeButton = await waitForInteractionModeButton("Chat");
+      const initialModeButton = await waitForInteractionModeButton("Build");
       expect(initialModeButton.title).toContain("enter plan mode");
 
       window.dispatchEvent(
@@ -2124,7 +2124,7 @@ describe("ChatView timeline estimator parity (full app)", () => {
       );
       await waitForLayout();
 
-      expect((await waitForInteractionModeButton("Chat")).title).toContain("enter plan mode");
+      expect((await waitForInteractionModeButton("Build")).title).toContain("enter plan mode");
 
       const composerEditor = await waitForComposerEditor();
       composerEditor.focus();
@@ -2140,7 +2140,7 @@ describe("ChatView timeline estimator parity (full app)", () => {
       await vi.waitFor(
         async () => {
           expect((await waitForInteractionModeButton("Plan")).title).toContain(
-            "return to normal chat mode",
+            "return to normal build mode",
           );
         },
         { timeout: 8_000, interval: 16 },
@@ -2157,7 +2157,7 @@ describe("ChatView timeline estimator parity (full app)", () => {
 
       await vi.waitFor(
         async () => {
-          expect((await waitForInteractionModeButton("Chat")).title).toContain("enter plan mode");
+          expect((await waitForInteractionModeButton("Build")).title).toContain("enter plan mode");
         },
         { timeout: 8_000, interval: 16 },
       );
diff --git a/apps/web/src/components/ChatView.tsx b/apps/web/src/components/ChatView.tsx
index 185fa7c2ee4a26750ce5afee1d34e1bf47efe5a5..5d160f4bda796bbdb53f3f67ff8ac8c3812bb2f3 100644
--- a/apps/web/src/components/ChatView.tsx
+++ b/apps/web/src/components/ChatView.tsx
@@ -1476,7 +1476,7 @@ export default function ChatView({ threadId }: ChatViewProps) {
           type: "slash-command",
           command: "default",
           label: "/default",
-          description: "Switch this thread back to normal chat mode",
+          description: "Switch this thread back to normal build mode",
         },
       ] satisfies ReadonlyArray<Extract<ComposerCommandItem, { type: "slash-command" }>>;
       const query = composerTrigger.query.trim().toLowerCase();
@@ -4029,7 +4029,7 @@ export default function ChatView({ threadId }: ChatViewProps) {
             <form
               ref={composerFormRef}
               onSubmit={onSend}
-              className="mx-auto w-full min-w-0 max-w-[52rem]"
+              className="mx-auto w-full min-w-0 max-w-208"
               data-chat-composer-form="true"
             >
               <div
@@ -4284,13 +4284,13 @@ export default function ChatView({ threadId }: ChatViewProps) {
                               onClick={toggleInteractionMode}
                               title={
                                 interactionMode === "plan"
-                                  ? "Plan mode — click to return to normal chat mode"
+                                  ? "Plan mode — click to return to normal build mode"
                                   : "Default mode — click to enter plan mode"
                               }
                             >
                               <BotIcon />
                               <span className="sr-only sm:not-sr-only">
-                                {interactionMode === "plan" ? "Plan" : "Chat"}
+                                {interactionMode === "plan" ? "Plan" : "Build"}
                               </span>
                             </Button>