fix: DeerFlow brand casing in disclaimer, What's New title, setup-sandbox .PHONY (#4970)

* fix: DeerFlow brand casing in disclaimer, 'What's New' title, setup-sandbox .PHONY

- en-US disclaimer said 'Deerflow'; every other user-facing string
  brands it 'DeerFlow' (rendered under the chat composer)
- landing section title 'Whats New in DeerFlow 2.0' -> 'What's New'
- setup-sandbox was the only Makefile target missing from .PHONY

* test: align disclaimer assertions with DeerFlow brand casing

The unit and e2e suites still expected the old "Deerflow" spelling in
inputBox.disclaimer; update both to the corrected locale string so the
i18n load test and the chat footer assertion pass again.

---------

Co-authored-by: Willem Jiang <willem.jiang@gmail.com>

Makefile

@@ -1,6 +1,6 @@
 # DeerFlow - Unified Development Environment
 
-.PHONY: help config config-upgrade check check-agent-guidance install extension-install extension-list extension-enable extension-disable extension-remove setup doctor support-bundle detect-thread-boundaries detect-blocking-io dev dev-daemon start start-daemon nginx stop up down clean docker-init docker-start docker-stop docker-logs docker-logs-frontend docker-logs-gateway docker-logs-redis
+.PHONY: help config config-upgrade check check-agent-guidance install extension-install extension-list extension-enable extension-disable extension-remove setup doctor support-bundle detect-thread-boundaries detect-blocking-io dev dev-daemon start start-daemon nginx stop up down clean docker-init docker-start docker-stop docker-logs docker-logs-frontend docker-logs-gateway docker-logs-redis setup-sandbox
 
 BASH ?= bash
 BACKEND_UV_RUN = cd backend && uv run

frontend/src/components/landing/sections/whats-new-section.tsx

@@ -68,7 +68,7 @@ export function WhatsNewSection({ className }: { className?: string }) {
   return (
     <Section
       className={cn("", className)}
-      title="Whats New in DeerFlow 2.0"
+      title="What's New in DeerFlow 2.0"
       subtitle="DeerFlow is now evolving from a Deep Research agent into a full-stack Super Agent"
     >
       <div

frontend/src/core/i18n/locales/en-US.ts

@@ -160,7 +160,7 @@ export const enUS: Translations = {
   // Input Box
   inputBox: {
     placeholder: "How can I assist you today?",
-    disclaimer: "Deerflow is AI and can make mistakes",
+    disclaimer: "DeerFlow is AI and can make mistakes",
     createSkillPrompt:
       "We're going to build a new skill step by step with `skill-creator`. To start, what do you want this skill to do?",
     addAttachments: "Add attachments",

frontend/tests/e2e/agent-chat.spec.ts

@@ -43,7 +43,7 @@ test.describe("Agent chat", () => {
     const textarea = page.getByPlaceholder(/how can i assist you/i);
     await expect(textarea).toBeVisible({ timeout: 15_000 });
     await expect(
-      page.getByText("Deerflow is AI and can make mistakes", { exact: true }),
+      page.getByText("DeerFlow is AI and can make mistakes", { exact: true }),
     ).toBeVisible();
   });
 

frontend/tests/unit/core/i18n/translations.test.ts

@@ -9,7 +9,7 @@ describe("core copy loading", () => {
       loadTranslations("zh-CN"),
     ]);
     expect(english.inputBox.disclaimer).toBe(
-      "Deerflow is AI and can make mistakes",
+      "DeerFlow is AI and can make mistakes",
     );
     expect(chinese.inputBox.disclaimer).toBe(
       "内容由AI生成，重要信息请务必核查",