fix(B05·B06): 관 · 구조물을 전부 지우고 떠나도 묻는 창이 뜨게 함 (PLAN 469-3 · 요구 432)

- 빈 목록 초안 "[]" 판정을 draftFilled 한 함수로 — 떠남 확인(design_leave)과 hasDrafts 가 같은 규칙
- 저장분이 있는 목록 칸의 "[]" = 고침 · 저장분도 빈 곳 · 저장분을 모를 때 = 전처럼 빈 칸
- 저장분 있음은 페이지 자료 줄(design_page_data)이 받을 때 적음 — 새 서버 요청 없음
- 지킴 시험 test_469_3 · 자료 줄 흉내 헬퍼 둘에 새 import 흉내

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

resources/tester/helper_273_2_preview_stations.cjs

@@ -56,6 +56,7 @@ const drafts = loadTs("B06_Section/B06_Section_Section_Drafts.ts", {
       fetchSectionContext: async () => ({ route_id: 1 }),
     },
     "./design_page_route": loadTs("A00_Common/design/design_page_route.ts"), // 노선 id 한 칸(386-2b)
+    "../b_page_state": { noteSavedList: () => undefined, forgetSavedLists: () => undefined },
   }),
   "../B05_Profile/B05_Profile_Api_Pipes_Draft": { readPendingPipes: () => draftPipes },
   "../B05_Profile/B05_Profile_Api_PlusStations": { readPlusDraft: () => null },

resources/tester/helper_384_2_page_data.cjs

@@ -15,6 +15,7 @@ const routeBox = { exports: {} };
 new Function("exports", "module", "require", routeJs)(routeBox.exports, routeBox, () => ({}));
 const STUBS = {
   "./design_page_route": routeBox.exports, // 노선 id 한 칸(386-2b · 진짜)
+  "../b_page_state": { noteSavedList: () => undefined, forgetSavedLists: () => undefined },
   "../../B04_PreProcess/B04_PreProcess_Api_Fetch": {
     fetchDetailPipePoints: async () => {
       calls.pipes += 1;

resources/tester/helper_469_3_list_draft.cjs

@@ -0,0 +1,69 @@
+/* 469-3 빈 목록 초안("[]") 떠남 판정 헬퍼 — `design_leave` · `b_page_state` 를 한 번씩만 읽어(같은 모듈 한 벌)
+ * 저장분 있음/없음에 따라 designDirty · hasDrafts 가 같게 나오는지. 결과 JSON 을 stdout 으로.
+ */
+const path = require("path");
+const { makeLoader } = require("./helper_ts_stub_loader.cjs");
+
+const ROOT = path.join(__dirname, "..", "..");
+
+const map = new Map();
+const session = {
+  getItem: (key) => (map.has(key) ? map.get(key) : null),
+  setItem: (key, value) => map.set(key, String(value)),
+  removeItem: (key) => map.delete(key),
+  key: (index) => [...map.keys()][index] ?? null,
+  get length() {
+    return map.size;
+  },
+};
+globalThis.window = { sessionStorage: session, localStorage: session };
+globalThis.sessionStorage = session;
+
+const STUBS = {
+  "@config/config_frontend": {
+    ROUTES: { B05_PROFILE: "/b05-profile", B06_SECTION: "/b06-section" },
+  },
+  "@ui/ui_template_locale": { t: (key) => key },
+  "../b_project_switch": { guardProjectLeave: () => undefined },
+};
+const { loadTs } = makeLoader({
+  root: ROOT,
+  requireFor: (full, file) => (request) => {
+    if (request in STUBS) return STUBS[request];
+    if (request.startsWith(".")) return loadTs(path.join(path.dirname(file), `${request}.ts`));
+    return require(request);
+  },
+});
+const state = loadTs(path.join(ROOT, "A00_Common", "b_page_state.ts"));
+const leave = loadTs(path.join(ROOT, "A00_Common", "design", "design_leave.ts"));
+const P = "p1";
+const set = (name, raw) => session.setItem(`aislo:draft:${name}:${P}`, raw);
+const unset = (name) => session.removeItem(`aislo:draft:${name}:${P}`);
+const both = () => [leave.designDirty(P), state.hasDrafts(P)];
+
+const out = {};
+set("pipes", "[]");
+out.unknownSaved = both(); // 저장분을 모름 = 빈 칸(전과 같음)
+state.noteSavedList(P, "pipes", false);
+out.savedEmpty = both(); // 처음부터 관 0
+state.noteSavedList(P, "pipes", true);
+out.savedFilled = both(); // 관 있던 곳에서 모두 지움
+unset("pipes");
+set("structures", "[]");
+out.structuresSavedEmpty = both();
+state.noteSavedList(P, "structures", true);
+out.structuresSavedFilled = both();
+leave.discardDesignEdits(P);
+out.afterDiscard = [both(), session.getItem(`aislo:draft:structures:${P}`)];
+set("pipes", "[]");
+state.forgetSavedLists(P);
+out.afterForget = both();
+for (const raw of ["{}", ""]) {
+  set("pipes", raw);
+  state.noteSavedList(P, "pipes", true);
+  out[`raw_${raw || "empty"}`] = both();
+}
+state.noteSavedList(P, "pipes", true);
+set("pipes", '[{"id":1}]');
+out.withItems = both();
+process.stdout.write(JSON.stringify(out));

resources/tester/test_469_3_list_draft_leave.py

@@ -0,0 +1,44 @@
+"""469-3 빈 목록 초안("[]") 떠남 판정 — 저장분이 있으면 고침 · 없으면 빈 칸 · 떠남 확인과 hasDrafts 한 규칙.
+
+./venv/Scripts/python.exe -m pytest resources/tester/test_469_3_list_draft_leave.py -q
+"""
+
+from __future__ import annotations
+
+import json
+import subprocess
+from pathlib import Path
+
+import pytest
+
+HELPER = Path(__file__).resolve().parent / "helper_469_3_list_draft.cjs"
+
+
+@pytest.fixture(scope="module")
+def out() -> dict:
+    run = subprocess.run(  # noqa: S603 — 고정 실행 파일
+        ["node", str(HELPER)], capture_output=True, text=True, encoding="utf-8"
+    )
+    assert run.returncode == 0, run.stderr
+    return json.loads(run.stdout)
+
+
+def test_저장분이_비었거나_모르면_빈_칸(out) -> None:
+    assert out["unknownSaved"] == [False, False]
+    assert out["savedEmpty"] == [False, False]
+    assert out["structuresSavedEmpty"] == [False, False]
+    assert out["afterForget"] == [False, False]
+
+
+def test_저장분이_있는데_모두_지웠으면_고침(out) -> None:
+    assert out["savedFilled"] == [True, True]
+    assert out["structuresSavedFilled"] == [True, True]
+
+
+def test_폐기는_빈_목록_칸도_지움(out) -> None:
+    assert out["afterDiscard"] == [[False, False], None]
+
+
+def test_빈_객체_빈_글은_그대로_빈_칸_항목이_있으면_고침(out) -> None:
+    assert out["raw_{}"] == [False, False] and out["raw_empty"] == [False, False]
+    assert out["withItems"] == [True, True]