src/app/api/export/route.ts

@@ -165,6 +165,7 @@ export const buildStaticHtml = (blocks: Block[], projectConfig?: ProjectConfig):
   // - formBlockIdToFormDomId: key = FormBlock id, value = <form> 요소의 DOM id
   const fieldIdToFormId = new Map<string, string>();
   const formBlockIdToFormDomId = new Map<string, string>();
+  const submitButtonIdToFormDomId = new Map<string, string>();
   const requiredFieldIdSet = new Set<string>();
   // 테스트 및 기존 Export HTML 과의 호환성을 위해 FormBlock 의 DOM id 규칙을 다음과 같이 정의한다.
   // - block.id 가 "form_숫자" 패턴이면 기존과 동일하게 formDomId = `form_${block.id}` (예: form_1 → form_form_1)
@@ -190,6 +191,11 @@ export const buildStaticHtml = (blocks: Block[], projectConfig?: ProjectConfig):
       }
     }
 
+    const submitButtonIdRaw = props.submitButtonId;
+    if (typeof submitButtonIdRaw === "string" && submitButtonIdRaw.trim() !== "") {
+      submitButtonIdToFormDomId.set(submitButtonIdRaw, formDomId);
+    }
+
     const requiredFieldIds = Array.isArray(props.requiredFieldIds) ? props.requiredFieldIds : [];
     for (const fieldId of requiredFieldIds) {
       if (typeof fieldId === "string" && fieldId.trim() !== "") {
@@ -284,6 +290,13 @@ export const buildStaticHtml = (blocks: Block[], projectConfig?: ProjectConfig):
         innerHtml = `<img src="${imgSrc}" alt="${imgAlt}" />${innerHtml}`;
       }
 
+      const submitFormId = submitButtonIdToFormDomId.get(block.id);
+      if (submitFormId) {
+        return `<div class="${tokens.alignClass}"><button type="submit" form="${escapeAttr(
+          submitFormId,
+        )}" class="${btnClasses}"${styleAttr}>${innerHtml}</button></div>`;
+      }
+
       return `<div class="${tokens.alignClass}"><a href="${escapeAttr(
         href,
       )}" class="${btnClasses}"${styleAttr}>${innerHtml}</a></div>`;

src/app/editor/forms/FormControllerPanel.tsx

@@ -1,7 +1,9 @@
 "use client";
 
+import { useState } from "react";
 import type { Block, ButtonBlockProps, FormBlockProps } from "@/features/editor/state/editorStore";
 import { NumericPropertyControl } from "@/features/editor/components/NumericPropertyControl";
+import { computeFormControllerPublicTokens } from "@/features/editor/utils/formHelpers";
 
 interface FormControllerPanelProps {
   block: Block; // type === "form"
@@ -13,8 +15,59 @@ interface FormControllerPanelProps {
 export function FormControllerPanel({ block, blocks, selectedBlockId, updateBlock }: FormControllerPanelProps) {
   if (!selectedBlockId || block.id !== selectedBlockId) return null;
 
+  const [showSheetsGuide, setShowSheetsGuide] = useState(false);
+
   const formProps = block.props as FormBlockProps;
 
+  const sheetsScriptExample = (() => {
+    const tokens = computeFormControllerPublicTokens(block, blocks);
+    const fieldNames = tokens.fields.map((f) => f.name).filter((name) => !!name);
+
+    if (fieldNames.length === 0) {
+      return (
+        "function doPost(e) {\n" +
+        '  var sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("시트1");\n' +
+        "  if (!sheet) { sheet = SpreadsheetApp.getActiveSpreadsheet().getSheets()[0]; }\n" +
+        "  var params = e.parameter; // x-www-form-urlencoded\n" +
+        "  var row = [\n" +
+        '    params.name || "",\n' +
+        '    params.email || "",\n' +
+        '    params.message || "",\n' +
+        "    new Date(),\n" +
+        "  ];\n" +
+        "  sheet.appendRow(row);\n" +
+        "  return ContentService\n" +
+        "    .createTextOutput(JSON.stringify({ ok: true }))\n" +
+        "    .setMimeType(ContentService.MimeType.JSON);\n" +
+        "}"
+      );
+    }
+
+    const headerNames = [...fieldNames, "createdAt"];
+    const rowLines = fieldNames.map((name) => `    params.${name} || "",`);
+    rowLines.push("    new Date(),");
+
+    const lines: string[] = [];
+    lines.push("function doPost(e) {");
+    lines.push('  var sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("시트1");');
+    lines.push("  if (!sheet) { sheet = SpreadsheetApp.getActiveSpreadsheet().getSheets()[0]; }");
+    lines.push("  var params = e.parameter; // x-www-form-urlencoded");
+    lines.push("  // 시트의 1행 헤더는 다음과 같이 맞춰 주세요:");
+    lines.push(`  // ${headerNames.join(", ")}`);
+    lines.push("  var row = [");
+    for (const line of rowLines) {
+      lines.push(line);
+    }
+    lines.push("  ];");
+    lines.push("  sheet.appendRow(row);");
+    lines.push("  return ContentService");
+    lines.push("    .createTextOutput(JSON.stringify({ ok: true }))");
+    lines.push("    .setMimeType(ContentService.MimeType.JSON);");
+    lines.push("}");
+
+    return lines.join("\n");
+  })();
+
   return (
     <div className="space-y-4 text-xs">
       <p className="text-slate-400">
@@ -40,9 +93,9 @@ export function FormControllerPanel({ block, blocks, selectedBlockId, updateBloc
         </div>
 
         {formProps.submitTarget === "webhook" && (
-          <div className="space-y-2">
+          <div className="space-y-3">
             <label className="flex flex-col gap-1">
-              <span className="text-slate-400">Webhook / Google Sheets URL</span>
+              <span className="text-slate-400">Webhook URL (예: Google Apps Script 웹 앱 URL)</span>
               <input
                 className="w-full rounded border border-slate-700 bg-slate-950 px-2 py-1 text-xs outline-none focus:border-sky-500"
                 placeholder="예: https://script.google.com/macros/s/.../exec"
@@ -126,6 +179,16 @@ export function FormControllerPanel({ block, blocks, selectedBlockId, updateBloc
                 }}
               />
             </label>
+
+            <div className="flex justify-end">
+              <button
+                type="button"
+                className="inline-flex items-center gap-1 rounded border border-slate-700 bg-slate-900 px-2 py-1 text-[11px] text-slate-100 hover:bg-slate-800"
+                onClick={() => setShowSheetsGuide(true)}
+              >
+                Google Sheets 연동 가이드
+              </button>
+            </div>
           </div>
         )}
       </div>
@@ -325,6 +388,41 @@ export function FormControllerPanel({ block, blocks, selectedBlockId, updateBloc
           </select>
         </div>
       </div>
+
+      {showSheetsGuide && (
+        <div className="fixed inset-0 z-50 flex items-center justify-center bg-slate-950/70">
+          <div className="w-full max-w-xl rounded border border-slate-800 bg-slate-950 px-4 py-3 shadow-lg">
+            <div className="mb-2 flex items-center justify-between">
+              <h4 className="text-[11px] font-semibold text-slate-100">Google Sheets 연동 가이드</h4>
+              <button
+                type="button"
+                className="text-[11px] text-slate-400 hover:text-slate-100"
+                onClick={() => setShowSheetsGuide(false)}
+                aria-label="Google Sheets 연동 가이드 닫기"
+              >
+                닫기
+              </button>
+            </div>
+            <p className="text-[11px] text-slate-400 leading-relaxed">
+              구글 시트 주소를 그대로 입력하는 것이 아니라, 시트에 연결된 Google Apps Script 웹 앱 URL 을 입력해야 합니다.
+              아래 순서를 따르면 코드를 잘 모르는 사용자도 연동할 수 있습니다.
+            </p>
+            <ol className="list-decimal list-inside space-y-1 text-[11px] text-slate-400 mt-2">
+              <li>Google Sheets 에서 새 스프레드시트를 만들고, 1행에 name, email, message 같은 헤더를 추가합니다.</li>
+              <li>시트 메뉴의 "확장 프로그램 → 앱스 스크립트" 를 열고 아래 예제 코드를 붙여넣습니다.</li>
+              <li>"배포 → 새 배포" 에서 웹 앱으로 배포한 뒤, 발급된 웹 앱 URL(…/exec) 을 Webhook URL 칸에 붙여넣습니다.</li>
+            </ol>
+            <div className="mt-2 space-y-1">
+              <span className="text-[11px] text-slate-400">예시 Apps Script 코드</span>
+              <textarea
+                className="w-full h-40 rounded border border-slate-800 bg-slate-950 px-2 py-1 text-[11px] font-mono text-slate-200"
+                readOnly
+                value={sheetsScriptExample}
+              />
+            </div>
+          </div>
+        </div>
+      )}
     </div>
   );
 }

src/app/editor/page.tsx

@@ -150,6 +150,7 @@ function EditorPageInner() {
   const [projectMessage, setProjectMessage] = useState("");
   // 멀티 선택(MVP)을 위한 로컬 선택 상태: 단일 선택(selectedBlockId)과 병행 사용한다.
   const [selectedBlockIds, setSelectedBlockIds] = useState<string[]>([]);
+  const [initializedNewProjectFromQuery, setInitializedNewProjectFromQuery] = useState(false);
 
   const historyLength = useEditorStore((state) => (state as any).history?.length ?? 0);
   const futureLength = useEditorStore((state) => (state as any).future?.length ?? 0);
@@ -176,6 +177,75 @@ function EditorPageInner() {
     }
   }, [initialSlugFromQuery, projectConfig?.slug, updateProjectConfig]);
 
+  useEffect(() => {
+    if (!searchParams) return;
+
+    if (initializedNewProjectFromQuery) return;
+
+    const newParam = searchParams.get("new");
+    if (newParam !== "1") return;
+
+    if (blocks.length > 0) {
+      replaceBlocks([]);
+    }
+
+    updateProjectConfig({
+      title: "새 페이지",
+      slug: "my-landing",
+      canvasPreset: "full",
+      canvasBgColorHex: "#020617",
+      bodyBgColorHex: "#020617",
+      headHtml: "",
+      trackingScript: "",
+      seoTitle: "",
+      seoDescription: "",
+      seoOgImageUrl: "",
+      seoCanonicalUrl: "",
+      seoNoIndex: false,
+    } as ProjectConfig);
+
+    resetHistory();
+    setInitializedNewProjectFromQuery(true);
+  }, [searchParams, initializedNewProjectFromQuery, blocks.length, replaceBlocks, updateProjectConfig, resetHistory]);
+
+  useEffect(() => {
+    if (!searchParams) return;
+
+    const slugParam = searchParams.get("slug");
+    if (slugParam && slugParam.trim().length > 0) {
+      // URL 에 slug 쿼리 파라미터가 있으면 기존 프로젝트 편집 중이므로,
+      // 자동 슬러그 생성은 동작시키지 않는다.
+      return;
+    }
+
+    const currentSlugRaw = projectConfig?.slug;
+    const currentSlug = typeof currentSlugRaw === "string" ? currentSlugRaw.trim() : "";
+
+    // 초기 상태("my-landing") 또는 비어 있는 경우에만 자동 슬러그를 한 번 생성한다.
+    if (currentSlug && currentSlug !== "my-landing") {
+      return;
+    }
+
+    const now = new Date();
+    const datePart = [
+      now.getFullYear().toString().padStart(4, "0"),
+      (now.getMonth() + 1).toString().padStart(2, "0"),
+      now.getDate().toString().padStart(2, "0"),
+    ].join("");
+
+    const timePart = [
+      now.getHours().toString().padStart(2, "0"),
+      now.getMinutes().toString().padStart(2, "0"),
+      now.getSeconds().toString().padStart(2, "0"),
+    ].join("");
+
+    const randomPart = Math.random().toString(36).slice(2, 6);
+
+    const generatedSlug = `page-${datePart}-${timePart}-${randomPart}`;
+
+    updateProjectConfig({ slug: generatedSlug });
+  }, [searchParams, projectConfig?.slug, updateProjectConfig]);
+
   useEffect(() => {
     if (!authChecked) return;
     if (!initialSlugFromQuery) return;
@@ -817,6 +887,52 @@ function EditorPageInner() {
     }
   }, [blocks, projectConfig, authUserId, authChecked]);
 
+  useEffect(() => {
+    if (!authChecked) return;
+    if (!authUserId) return;
+    if (typeof window === "undefined") return;
+
+    const slugRaw = projectConfig?.slug;
+    const slug = typeof slugRaw === "string" ? slugRaw.trim() : "";
+    if (!slug || slug === "my-landing") return;
+
+    const titleRaw = projectConfig?.title;
+    const title = (typeof titleRaw === "string" ? titleRaw.trim() : "") || "제목 없음";
+
+    const intervalEnv = process.env.NEXT_PUBLIC_EDITOR_SERVER_AUTOSAVE_MS;
+    const intervalMs = intervalEnv ? Number(intervalEnv) || 20000 : 20000;
+    let cancelled = false;
+
+    const saveOnce = async () => {
+      if (cancelled) return;
+
+      try {
+        await fetch("/api/projects", {
+          method: "POST",
+          headers: {
+            "Content-Type": "application/json",
+          },
+          body: JSON.stringify({
+            title,
+            slug,
+            contentJson: blocks,
+          }),
+        });
+      } catch {
+        // 서버 자동 저장 실패는 치명적이지 않으므로 조용히 무시한다.
+      }
+    };
+
+    const id = window.setInterval(() => {
+      void saveOnce();
+    }, intervalMs);
+
+    return () => {
+      cancelled = true;
+      window.clearInterval(id);
+    };
+  }, [authChecked, authUserId, projectConfig?.slug, projectConfig?.title, blocks]);
+
   // 에디터 전역에서 Undo/Redo 단축키(Cmd/Ctrl+Z, Cmd/Ctrl+Shift+Z),
   // Delete/Backspace 기반 삭제, Cmd/Ctrl+D 기반 복제,
   // ArrowUp/ArrowDown을 이용한 선택 블록 이동을 처리한다.

src/app/p/[slug]/PublicProjectPageClient.tsx

@@ -0,0 +1,114 @@
+"use client";
+
+import { useEffect, useState } from "react";
+
+interface PublicProjectPageClientProps {
+  html: string;
+}
+
+export default function PublicProjectPageClient({ html }: PublicProjectPageClientProps) {
+  const [toastMessage, setToastMessage] = useState<string | null>(null);
+
+  useEffect(() => {
+    if (typeof document === "undefined" || typeof window === "undefined") return;
+
+    let toastTimeout: number | null = null;
+
+    const showToast = (message: string) => {
+      setToastMessage(message);
+      if (toastTimeout !== null) {
+        window.clearTimeout(toastTimeout);
+      }
+      toastTimeout = window.setTimeout(() => {
+        setToastMessage(null);
+      }, 4000);
+    };
+
+    const forms = document.querySelectorAll<HTMLFormElement>(
+      'form.pb-form-controller, form[action="/api/forms/submit"]',
+    );
+    if (!forms || forms.length === 0) return;
+
+    forms.forEach((form) => {
+      if (form.dataset.pbInitialized === "1") return;
+      form.dataset.pbInitialized = "1";
+
+      form.addEventListener("submit", (event) => {
+        if (!form) return;
+        if (event && typeof event.preventDefault === "function") {
+          event.preventDefault();
+        }
+
+        const formData = new FormData(form);
+        const configInput = form.querySelector<HTMLInputElement>('input[name="__config"]');
+        let config: any = null;
+        if (configInput && configInput.value) {
+          try {
+            config = JSON.parse(configInput.value);
+          } catch {
+            config = null;
+          }
+        }
+
+        const action = form.getAttribute("action") || "/api/forms/submit";
+
+        fetch(action, { method: "POST", body: formData })
+          .then((res) => res.json().catch(() => ({})))
+          .then((data: any) => {
+            const ok = data && data.ok;
+            const message = data && data.message;
+            if (ok) {
+              const success =
+                message || (config && config.successMessage) || "성공적으로 전송되었습니다.";
+              showToast(success);
+              try {
+                form.reset();
+              } catch {}
+            } else {
+              const errorMsg =
+                message || (config && config.errorMessage) || "전송 중 오류가 발생했습니다.";
+              showToast(errorMsg);
+            }
+          })
+          .catch(() => {
+            const errorMsg =
+              (config && config.errorMessage) || "전송 중 오류가 발생했습니다.";
+            showToast(errorMsg);
+          });
+      });
+    });
+
+    return () => {
+      if (toastTimeout !== null) {
+        window.clearTimeout(toastTimeout);
+      }
+    };
+  }, []);
+
+  return (
+    <>
+      <div dangerouslySetInnerHTML={{ __html: html }} />
+      {toastMessage ? (
+        <div
+          style={{
+            position: "fixed",
+            right: "16px",
+            bottom: "16px",
+            zIndex: 50,
+            maxWidth: "320px",
+            padding: "12px 16px",
+            borderRadius: "8px",
+            backgroundColor: "rgba(15, 23, 42, 0.95)",
+            color: "#e5e7eb",
+            fontSize: "14px",
+            lineHeight: "1.4",
+            boxShadow: "0 10px 25px rgba(15, 23, 42, 0.6)",
+            pointerEvents: "none",
+          }}
+        >
+          {toastMessage}
+        </div>
+      ) : null}
+    </>
+  );
+}

src/app/p/[slug]/page.tsx

@@ -4,6 +4,7 @@ import { PrismaClient } from "@prisma/client";
 import type { Block, ProjectConfig } from "@/features/editor/state/editorStore";
 import { buildStaticHtml } from "@/features/export/buildStaticHtml";
 import { getCachedPublicProject } from "@/features/projects/publicCache";
+import PublicProjectPageClient from "./PublicProjectPageClient";
 
 const prisma = new PrismaClient();
 
@@ -75,5 +76,5 @@ export default async function PublicProjectPage({ params }: PageParams) {
   const mainMatch = fullHtml.match(/<main[\s\S]*?<\/main>/);
   const mainHtml = mainMatch ? mainMatch[0] : "";
 
-  return <div dangerouslySetInnerHTML={{ __html: mainHtml }} />;
+  return <PublicProjectPageClient html={mainHtml} />;
 }

src/app/projects/page.tsx

@@ -220,7 +220,7 @@ export default function ProjectsPage() {
             <span>전체 제출 내역</span>
           </Link>
           <Link
-            href="/editor"
+            href="/editor?new=1"
             className="inline-flex items-center gap-1 rounded border border-sky-700 bg-sky-950 px-3 py-1 text-sky-100 hover:bg-sky-900 shadow-sm"
           >
             <FilePlus2 className="w-4 h-4" aria-hidden="true" />

src/styles/builder.css

@@ -60,6 +60,7 @@ body {
 
 .pb-section-inner {
   padding-inline: 1.5rem;
+  margin-inline: auto;
 }
 
 .pb-section-columns {

tests/api/export.spec.ts

@@ -2114,7 +2114,7 @@ describe("/api/export", () => {
     });
   });
 
-  describe("스타일 테스트", () => {
+  describe("buildStaticHtml", () => {
     it("text 블록은 pb 텍스트 스타일 클래스를 포함해야 한다", async () => {
       const blocks: Block[] = [
         {
@@ -2545,6 +2545,50 @@ describe("/api/export", () => {
       expect(html).toContain("섹션 레이아웃 텍스트");
     });
 
+    it("FormBlock.submitButtonId 로 매핑된 버튼은 해당 form 을 submit 하는 button 요소로 Export 되어야 한다", async () => {
+      const blocks: Block[] = [
+        {
+          id: "form_1",
+          type: "form",
+          props: {
+            fieldIds: ["field_email"],
+            requiredFieldIds: [],
+            submitButtonId: "submit_btn",
+          },
+        } as any,
+        {
+          id: "field_email",
+          type: "formInput",
+          props: {
+            label: "이메일",
+            formFieldName: "email",
+          },
+        } as any,
+        {
+          id: "submit_btn",
+          type: "button",
+          props: {
+            label: "폼 제출",
+            href: "#",
+          },
+        } as any,
+      ];
+
+      const projectConfig: ProjectConfig = {
+        title: "폼 제출 버튼 매핑 테스트",
+        slug: "form-submit-button-mapping-test",
+        canvasPreset: "full",
+      } as ProjectConfig;
+
+      const { buildStaticHtml } = await import("@/app/api/export/route");
+
+      const html = buildStaticHtml(blocks, projectConfig);
+
+      expect(html).toContain('<form id="form_form_1" class="pb-form-controller" method="post" action="/api/forms/submit"');
+      expect(html).toContain('type="submit" form="form_form_1"');
+      expect(html).toContain("폼 제출");
+    });
+
     it("formInput 블록의 textColorCustom 은 정적 HTML에서 input 텍스트 색상 스타일로 반영되어야 한다", async () => {
       const blocks: Block[] = [
         {
@@ -3178,6 +3222,7 @@ describe("/api/export", () => {
       expect(css).toContain(".pb-root-inner");
       expect(css).toContain("max-width: 72rem");
       expect(css).toContain(".pb-section-inner");
+      expect(css).toContain("margin-inline: auto");
       expect(css).toContain(".pb-section-columns");
       expect(css).toContain("gap: 2rem");
       expect(css).toContain(".pb-section-column");

tests/e2e/form-submission-flow.spec.ts

@@ -155,3 +155,106 @@ test("프리뷰 폼 제출 후 제출 내역 페이지에서 데이터가 보여
     await expect(page.getByText(messageValue)).toBeVisible();
   }
 });
+
+test("퍼블릭 페이지 폼 제출 후 제출 내역 페이지에서 데이터가 보여야 한다", async ({ page, request }) => {
+  const now = Date.now();
+  const email = `public-form-e2e-${now}@example.com`;
+  const password = "public-form-e2e-password";
+  const projectSlug = `public-form-e2e-project-${now}`;
+
+  const signupRes = await request.post("/api/auth/signup", {
+    headers: { "Content-Type": "application/json" },
+    data: { email, password },
+  });
+
+  expect(signupRes.status()).toBe(201);
+
+  const setCookieHeader = signupRes.headers()["set-cookie"];
+  expect(setCookieHeader).toBeTruthy();
+
+  const cookieHeaderString = Array.isArray(setCookieHeader)
+    ? setCookieHeader.join("; ")
+    : (setCookieHeader as string);
+
+  const match = cookieHeaderString.match(/pb_access=([^;]+)/);
+  expect(match).not.toBeNull();
+
+  const accessToken = match![1];
+
+  await page.context().addCookies([
+    {
+      name: "pb_access",
+      value: accessToken,
+      domain: "localhost",
+      path: "/",
+      httpOnly: true,
+      secure: false,
+      sameSite: "Lax",
+    },
+  ]);
+
+  await page.goto("/editor");
+
+  const propertiesSidebar = page.getByTestId("properties-sidebar");
+  await propertiesSidebar.getByLabel("프로젝트 제목").fill("E2E 퍼블릭 폼 프로젝트");
+  await propertiesSidebar.getByLabel("프로젝트 주소 (slug)").fill(projectSlug);
+
+  await page.getByRole("button", { name: "입력(Input)" }).click();
+  await page.getByRole("button", { name: "입력(Input)" }).click();
+  await page.getByRole("button", { name: "입력(Input)" }).click();
+  await page.getByRole("button", { name: "버튼" }).click();
+  await page.getByRole("button", { name: "폼 컨트롤러" }).click();
+
+  const fieldMappingGroup = page.getByRole("group", { name: "폼 필드 매핑" });
+  const fieldCheckboxes = fieldMappingGroup.locator("> label > input[type='checkbox']");
+  const fieldCount = await fieldCheckboxes.count();
+  for (let i = 0; i < fieldCount; i += 1) {
+    await fieldCheckboxes.nth(i).check({ force: true });
+  }
+
+  const submitSelect = page.getByRole("combobox", { name: "Submit 버튼" });
+  await submitSelect.selectOption({ index: 1 });
+
+  await page.getByRole("button", { name: "메뉴 ▼" }).click();
+  await page.getByRole("button", { name: "프로젝트 저장/불러오기" }).click();
+  await page.getByRole("button", { name: "저장 (로컬 + 서버)" }).click();
+
+  await expect(page).toHaveURL(/\/_?projects/);
+  await expect(page.getByText(projectSlug)).toBeVisible();
+
+  await page.goto(`/p/${projectSlug}`);
+
+  const nameValue = "홍길동";
+  const emailValue = `public-submitted-${now}@example.com`;
+  const messageValue = "퍼블릭 E2E 테스트 메시지";
+
+  const inputs = page.locator("input.pb-input");
+  const inputCount = await inputs.count();
+  expect(inputCount).toBeGreaterThanOrEqual(2);
+
+  await inputs.nth(0).fill(nameValue);
+  await inputs.nth(1).fill(emailValue);
+  if (inputCount >= 3) {
+    await inputs.nth(2).fill(messageValue);
+  }
+
+  await page.getByRole("button", { name: "버튼" }).click();
+
+  await expect(page.getByText("성공적으로 전송되었습니다.")).toBeVisible();
+
+  await page.goto("/projects");
+  await expect(page).toHaveURL(/\/_?projects/);
+
+  const submissionsRow = page.locator("tr", { hasText: projectSlug }).first();
+  await submissionsRow.getByRole("link", { name: "폼 제출 내역" }).click();
+
+  await expect(page).toHaveURL(new RegExp(`/projects/${projectSlug}/submissions`));
+  await expect(page.getByRole("heading", { name: "폼 제출 내역" })).toBeVisible();
+  await expect(page.getByText(projectSlug)).toBeVisible();
+
+  await expect(page.getByText(nameValue)).toBeVisible();
+  await expect(page.getByText(emailValue)).toBeVisible();
+  if (inputCount >= 3) {
+    await expect(page.getByText(messageValue)).toBeVisible();
+  }
+});

tests/unit/EditorNewProjectFromProjects.spec.tsx

@@ -0,0 +1,155 @@
+import { describe, it, expect, beforeEach, afterEach, vi } from "vitest";
+import { render, cleanup, waitFor } from "@testing-library/react";
+import EditorPage from "@/app/editor/page";
+import type { Block, ProjectConfig } from "@/features/editor/state/editorStore";
+
+let mockState: any;
+let searchParamsSlug: string | null = null;
+let searchParamsNew: string | null = null;
+
+beforeEach(() => {
+  const baseProjectConfig: ProjectConfig = {
+    title: "기존 프로젝트",
+    slug: "existing-slug",
+    canvasPreset: "full",
+  } as ProjectConfig;
+
+  mockState = {
+    blocks: [
+      {
+        id: "blk_existing",
+        type: "text",
+        props: {
+          text: "기존 프로젝트 블록",
+          align: "left",
+          size: "base",
+        },
+      },
+    ] as Block[],
+    projectConfig: baseProjectConfig,
+    selectedBlockId: null as string | null,
+    selectedListItemId: null as string | null,
+    undo: vi.fn(),
+    redo: vi.fn(),
+    removeBlock: vi.fn(),
+    duplicateBlock: vi.fn(),
+    selectBlock: vi.fn(),
+    selectListItem: vi.fn(),
+    replaceBlocks: vi.fn((nextBlocks: Block[]) => {
+      mockState.blocks = nextBlocks;
+    }),
+    reorderBlocks: vi.fn(),
+    moveBlock: vi.fn(),
+    addTextBlock: vi.fn(),
+    addButtonBlock: vi.fn(),
+    addImageBlock: vi.fn(),
+    addDividerBlock: vi.fn(),
+    addListBlock: vi.fn(),
+    addSectionBlock: vi.fn(),
+    addFormBlock: vi.fn(),
+    addFormInputBlock: vi.fn(),
+    addFormSelectBlock: vi.fn(),
+    addFormCheckboxBlock: vi.fn(),
+    addFormRadioBlock: vi.fn(),
+    addHeroTemplateSection: vi.fn(),
+    addFeaturesTemplateSection: vi.fn(),
+    addCtaTemplateSection: vi.fn(),
+    addFaqTemplateSection: vi.fn(),
+    addPricingTemplateSection: vi.fn(),
+    addTestimonialsTemplateSection: vi.fn(),
+    addBlogTemplateSection: vi.fn(),
+    addTeamTemplateSection: vi.fn(),
+    addFooterTemplateSection: vi.fn(),
+    updateBlock: vi.fn(),
+    updateProjectConfig: vi.fn((partial: Partial<ProjectConfig>) => {
+      mockState.projectConfig = {
+        ...(mockState.projectConfig as ProjectConfig),
+        ...partial,
+      } as ProjectConfig;
+    }),
+    resetHistory: vi.fn(),
+  };
+
+  window.localStorage.clear();
+  searchParamsSlug = null;
+  searchParamsNew = null;
+});
+
+afterEach(() => {
+  cleanup();
+  vi.unstubAllGlobals();
+});
+
+vi.mock("@/features/editor/state/editorStore", () => {
+  const useEditorStore = (selector: (state: any) => any) => selector(mockState);
+  (useEditorStore as any).getState = () => mockState;
+
+  return {
+    __esModule: true,
+    useEditorStore,
+  };
+});
+
+vi.mock("next/link", () => {
+  return {
+    __esModule: true,
+    default: ({ href, children }: any) => <a href={href}>{children}</a>,
+  };
+});
+
+vi.mock("next/navigation", () => {
+  return {
+    __esModule: true,
+    useRouter: () => ({
+      push: vi.fn(),
+    }),
+    useSearchParams: () => ({
+      get: (key: string) => {
+        if (key === "slug") return searchParamsSlug;
+        if (key === "new") return searchParamsNew;
+        return null;
+      },
+    }),
+  };
+});
+
+describe("EditorPage - 프로젝트 목록에서 새 프로젝트 만들기", () => {
+  it("/editor?new=1 로 진입하면 기존 프로젝트 상태를 초기화하고 새 캔버스를 열어야 한다", async () => {
+    searchParamsNew = "1";
+
+    const fetchMock = vi.fn().mockImplementation((input: any, init?: any) => {
+      const url = typeof input === "string" ? input : input.url;
+      const method = init?.method ?? "GET";
+
+      if (url === "/api/auth/me" && method === "GET") {
+        return Promise.resolve(
+          new Response(
+            JSON.stringify({ id: "user-1", email: "user@example.com", tokenVersion: 1 }),
+            {
+              status: 200,
+              headers: { "Content-Type": "application/json" },
+            },
+          ),
+        );
+      }
+
+      return Promise.resolve(new Response(null, { status: 200 }));
+    });
+
+    vi.stubGlobal("fetch", fetchMock as any);
+
+    render(<EditorPage />);
+
+    await waitFor(() => {
+      expect(fetchMock).toHaveBeenCalled();
+    });
+
+    await waitFor(() => {
+      expect(Array.isArray(mockState.blocks)).toBe(true);
+      expect(mockState.blocks.length).toBe(0);
+
+      const slug = (mockState.projectConfig as ProjectConfig).slug;
+      expect(slug).not.toBe("existing-slug");
+    });
+  });
+});

tests/unit/EditorServerAutosave.spec.tsx

@@ -0,0 +1,291 @@
+import { describe, it, expect, beforeEach, afterEach, vi } from "vitest";
+import { render, cleanup, waitFor } from "@testing-library/react";
+import EditorPage from "@/app/editor/page";
+import type { Block, ProjectConfig } from "@/features/editor/state/editorStore";
+
+let mockState: any;
+let searchParamsSlug: string | null = null;
+
+beforeEach(() => {
+  const baseProjectConfig: ProjectConfig = {
+    title: "서버 자동저장 테스트",
+    slug: "my-landing",
+    canvasPreset: "full",
+  } as ProjectConfig;
+
+  mockState = {
+    blocks: [
+      {
+        id: "blk_1",
+        type: "text",
+        props: {
+          text: "서버 자동저장 블록",
+          align: "left",
+          size: "base",
+        },
+      },
+    ] as Block[],
+    projectConfig: baseProjectConfig,
+    selectedBlockId: null as string | null,
+    selectedListItemId: null as string | null,
+    undo: vi.fn(),
+    redo: vi.fn(),
+    removeBlock: vi.fn(),
+    duplicateBlock: vi.fn(),
+    selectBlock: vi.fn(),
+    selectListItem: vi.fn(),
+    replaceBlocks: vi.fn(),
+    reorderBlocks: vi.fn(),
+    moveBlock: vi.fn(),
+    addTextBlock: vi.fn(),
+    addButtonBlock: vi.fn(),
+    addImageBlock: vi.fn(),
+    addDividerBlock: vi.fn(),
+    addListBlock: vi.fn(),
+    addSectionBlock: vi.fn(),
+    addFormBlock: vi.fn(),
+    addFormInputBlock: vi.fn(),
+    addFormSelectBlock: vi.fn(),
+    addFormCheckboxBlock: vi.fn(),
+    addFormRadioBlock: vi.fn(),
+    addHeroTemplateSection: vi.fn(),
+    addFeaturesTemplateSection: vi.fn(),
+    addCtaTemplateSection: vi.fn(),
+    addFaqTemplateSection: vi.fn(),
+    addPricingTemplateSection: vi.fn(),
+    addTestimonialsTemplateSection: vi.fn(),
+    addBlogTemplateSection: vi.fn(),
+    addTeamTemplateSection: vi.fn(),
+    addFooterTemplateSection: vi.fn(),
+    updateBlock: vi.fn(),
+    updateProjectConfig: vi.fn((partial: Partial<ProjectConfig>) => {
+      mockState.projectConfig = {
+        ...(mockState.projectConfig as ProjectConfig),
+        ...partial,
+      } as ProjectConfig;
+    }),
+    resetHistory: vi.fn(),
+  };
+
+  window.localStorage.clear();
+  searchParamsSlug = null;
+  (process.env as any).NEXT_PUBLIC_EDITOR_SERVER_AUTOSAVE_MS = "10";
+});
+
+afterEach(() => {
+  cleanup();
+  vi.unstubAllGlobals();
+  delete (process.env as any).NEXT_PUBLIC_EDITOR_SERVER_AUTOSAVE_MS;
+});
+
+vi.mock("@/features/editor/state/editorStore", () => {
+  const useEditorStore = (selector: (state: any) => any) => selector(mockState);
+  (useEditorStore as any).getState = () => mockState;
+
+  return {
+    __esModule: true,
+    useEditorStore,
+  };
+});
+
+vi.mock("next/link", () => {
+  return {
+    __esModule: true,
+    default: ({ href, children }: any) => <a href={href}>{children}</a>,
+  };
+});
+
+vi.mock("next/navigation", () => {
+  return {
+    __esModule: true,
+    useRouter: () => ({
+      push: vi.fn(),
+    }),
+    useSearchParams: () => ({
+      get: (key: string) => (key === "slug" ? searchParamsSlug : null),
+    }),
+  };
+});
+
+describe("EditorPage - 서버 자동 저장", () => {
+  it("로그인된 사용자가 새 페이지를 편집하면 자동 생성된 slug 로 /api/projects 에 주기적으로 저장해야 한다", async () => {
+    const fetchMock = vi.fn().mockImplementation((input: any, init?: any) => {
+      const url = typeof input === "string" ? input : input.url;
+      const method = init?.method ?? "GET";
+
+      if (url === "/api/auth/me" && method === "GET") {
+        return Promise.resolve(
+          new Response(
+            JSON.stringify({ id: "user-1", email: "user@example.com", tokenVersion: 1 }),
+            {
+              status: 200,
+              headers: { "Content-Type": "application/json" },
+            },
+          ),
+        );
+      }
+
+      if (url === "/api/projects" && method === "POST") {
+        return Promise.resolve(
+          new Response(
+            JSON.stringify({ slug: JSON.parse((init?.body as string) ?? "{}").slug }),
+            {
+              status: 201,
+              headers: { "Content-Type": "application/json" },
+            },
+          ),
+        );
+      }
+
+      return Promise.resolve(new Response(null, { status: 200 }));
+    });
+
+    vi.stubGlobal("fetch", fetchMock as any);
+
+    render(<EditorPage />);
+
+    await waitFor(() => {
+      expect(
+        fetchMock.mock.calls.some(
+          ([url, options]: any[]) => url === "/api/auth/me" && (options?.method ?? "GET") === "GET",
+        ),
+      ).toBe(true);
+    });
+
+    await waitFor(() => {
+      expect(
+        fetchMock.mock.calls.some(
+          ([url, options]: any[]) => url === "/api/projects" && (options?.method ?? "GET") === "POST",
+        ),
+      ).toBe(true);
+    });
+
+    const projectCall = fetchMock.mock.calls.find(
+      ([url, options]: any[]) => url === "/api/projects" && (options?.method ?? "GET") === "POST",
+    ) as any;
+
+    const [, options] = projectCall;
+    const body = JSON.parse((options.body as string) ?? "{}");
+
+    expect(typeof body.slug).toBe("string");
+    expect(body.slug).not.toBe("my-landing");
+    expect(mockState.projectConfig.slug).toBe(body.slug);
+  });
+
+  it("authUserId 가 없으면 /api/projects 자동 저장을 호출하지 않아야 한다", async () => {
+    const fetchMock = vi.fn().mockImplementation((input: any, init?: any) => {
+      const url = typeof input === "string" ? input : input.url;
+      const method = init?.method ?? "GET";
+
+      if (url === "/api/auth/me" && method === "GET") {
+        return Promise.resolve(new Response(null, { status: 200 }));
+      }
+
+      return Promise.resolve(new Response(null, { status: 200 }));
+    });
+
+    vi.stubGlobal("fetch", fetchMock as any);
+
+    render(<EditorPage />);
+
+    await waitFor(() => {
+      expect(
+        fetchMock.mock.calls.some(
+          ([url]: any[]) => url === "/api/auth/me",
+        ),
+      ).toBe(true);
+    });
+
+    const projectCalls = fetchMock.mock.calls.filter(
+      ([url, options]: any[]) => url === "/api/projects" && (options?.method ?? "GET") === "POST",
+    );
+
+    expect(projectCalls.length).toBe(0);
+  });
+
+  it("slug 쿼리 파라미터로 기존 프로젝트를 열었을 때는 해당 slug 로 서버 자동 저장을 해야 한다", async () => {
+    searchParamsSlug = "existing-slug";
+    mockState.projectConfig.slug = "my-landing" as any;
+
+    const fetchMock = vi.fn().mockImplementation((input: any, init?: any) => {
+      const url = typeof input === "string" ? input : input.url;
+      const method = init?.method ?? "GET";
+
+      if (url === "/api/auth/me" && method === "GET") {
+        return Promise.resolve(
+          new Response(
+            JSON.stringify({ id: "user-1", email: "user@example.com", tokenVersion: 1 }),
+            {
+              status: 200,
+              headers: { "Content-Type": "application/json" },
+            },
+          ),
+        );
+      }
+
+      if (url === "/api/projects/existing-slug" && method === "GET") {
+        return Promise.resolve(
+          new Response(
+            JSON.stringify({
+              slug: "existing-slug",
+              title: "기존 프로젝트",
+              contentJson: mockState.blocks,
+            }),
+            {
+              status: 200,
+              headers: { "Content-Type": "application/json" },
+            },
+          ),
+        );
+      }
+
+      if (url === "/api/projects" && method === "POST") {
+        return Promise.resolve(
+          new Response(
+            JSON.stringify({ slug: JSON.parse((init?.body as string) ?? "{}").slug }),
+            {
+              status: 201,
+              headers: { "Content-Type": "application/json" },
+            },
+          ),
+        );
+      }
+
+      return Promise.resolve(new Response(null, { status: 200 }));
+    });
+
+    vi.stubGlobal("fetch", fetchMock as any);
+
+    render(<EditorPage />);
+
+    await waitFor(() => {
+      expect(
+        fetchMock.mock.calls.some(
+          ([url, options]: any[]) =>
+            url === "/api/projects/existing-slug" && (options?.method ?? "GET") === "GET",
+        ),
+      ).toBe(true);
+    });
+
+    await waitFor(() => {
+      expect(
+        fetchMock.mock.calls.some(
+          ([url, options]: any[]) =>
+            url === "/api/projects" && (options?.method ?? "GET") === "POST",
+        ),
+      ).toBe(true);
+    });
+
+    const projectCall = fetchMock.mock.calls.find(
+      ([url, options]: any[]) => url === "/api/projects" && (options?.method ?? "GET") === "POST",
+    ) as any;
+
+    expect(projectCall).toBeTruthy();
+
+    const [, options] = projectCall;
+    const body = JSON.parse((options.body as string) ?? "{}");
+
+    expect(body.slug).toBe("existing-slug");
+    expect(mockState.projectConfig.slug).toBe("existing-slug");
+  });
+});

tests/unit/FormControllerPanel.spec.tsx

@@ -151,4 +151,75 @@ describe("FormControllerPanel", () => {
     // 기본 선택 값은 FormBlock.submitButtonId 이어야 한다.
     expect(select.value).toBe("btn-1");
   });
+
+  it("submitTarget 이 webhook 인 경우 Google Sheets 연동 가이드 텍스트를 보여줘야 한다", () => {
+    const formBlock = makeFormBlock("form-webhook", {
+      submitTarget: "webhook",
+    } as any);
+
+    const updateBlock = vi.fn();
+
+    render(
+      <FormControllerPanel
+        block={formBlock}
+        blocks={[formBlock]}
+        selectedBlockId="form-webhook"
+        updateBlock={updateBlock}
+      />,
+    );
+
+    const guideButton = screen.getByRole("button", { name: "Google Sheets 연동 가이드" });
+    guideButton.click();
+
+    // Google Sheets 연동 가이드 헤딩과 Apps Script 안내 문구가 노출되어야 한다.
+    expect(screen.getByText("Google Sheets 연동 가이드")).toBeTruthy();
+    expect(
+      screen.getByText(/Apps Script 웹 앱 URL/i),
+    ).toBeTruthy();
+  });
+
+  it("Google Sheets 가이드 모달의 Apps Script 코드가 컨트롤러에 매핑된 전송 키와 작성일시를 포함해야 한다", async () => {
+    const formBlock = makeFormBlock("form-webhook", {
+      submitTarget: "webhook",
+      fieldIds: ["input-name", "input-email"],
+    } as any);
+
+    const inputNameBlock: Block = {
+      id: "input-name",
+      type: "formInput",
+      props: {
+        label: "이름",
+        formFieldName: "name",
+      } as any,
+    } as any;
+
+    const inputEmailBlock: Block = {
+      id: "input-email",
+      type: "formInput",
+      props: {
+        label: "이메일",
+        formFieldName: "email",
+      } as any,
+    } as any;
+
+    const updateBlock = vi.fn();
+
+    render(
+      <FormControllerPanel
+        block={formBlock}
+        blocks={[formBlock, inputNameBlock, inputEmailBlock]}
+        selectedBlockId="form-webhook"
+        updateBlock={updateBlock}
+      />,
+    );
+
+    const guideButton = screen.getByRole("button", { name: "Google Sheets 연동 가이드" });
+    fireEvent.click(guideButton);
+
+    const scriptTextarea = (await screen.findByDisplayValue(/function doPost/)) as HTMLTextAreaElement;
+
+    expect(scriptTextarea.value).toContain("params.name || \"\"");
+    expect(scriptTextarea.value).toContain("params.email || \"\"");
+    expect(scriptTextarea.value).toContain("new Date()");
+  });
 });

uploads/32cdb1ef-47d0-4ded-a3c9-e83f6ae7df56

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+PNG TEST FIXTURE

uploads/556b2e0b-9206-4921-a394-f8b1e1210b3b

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+dummy-video

uploads/a0bf0df5-fc1d-4b19-bda0-1faf55bf98b3

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+PNG TEST FIXTURE

uploads/d01747fb-6cb1-47ee-886b-5c2709cc7b53

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+PNG TEST FIXTURE

uploads/dca1af8c-f113-414b-bd63-e3f4468cb632

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+PNG TEST FIXTURE

uploads/e7aeaeb6-268b-4e5d-baf3-8ba3638e4ee3

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+PNG TEST FIXTURE

uploads/test-image-1765085372285

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+dummy-image

uploads/test-image-1765087428870

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+dummy-image

uploads/test-image-1765104411326

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+dummy-image

uploads/test-section-bg-1765085372291

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+dummy-image

uploads/test-section-bg-1765087428876

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+dummy-image

uploads/test-section-bg-1765104411346

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+dummy-image

uploads/test-section-bg-video-1765085372312

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+dummy-section-video

uploads/test-section-bg-video-1765087428888

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+dummy-section-video

uploads/test-section-bg-video-1765104411371

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+dummy-section-video

uploads/test-video-1765085372310

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+dummy-video

uploads/test-video-1765087428887

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+dummy-video

uploads/test-video-1765104411365

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+dummy-video

uploads/test-video-poster-1765085372288

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+dummy-poster

uploads/test-video-poster-1765087428873

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+dummy-poster

uploads/test-video-poster-1765104411337

@@ -0,0 +1 @@
+dummy-poster