feat(est-test): 찾기 창 다음찾기와 한 건 바꾸기

- 원본 찾기 창처럼 처음부터/현재위치부터 다음찾기로 행 이동, 호표 자동 전환
- 단가산출 찾은 행 한 건 바꾸기 뒤 다음 위치로 이동
- 편집 메뉴 찾기와 Ctrl+F 로 열기

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

resources/tester/test_est_find.py

@@ -0,0 +1,78 @@
+"""EST 테스트 앱 찾기 창: 다음찾기 순서·호표 위치·산출근거 문구."""
+
+import json
+import subprocess
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[2]
+FILES = [
+    "native-math.js",
+    "native-formula.js",
+    "native-machine.js",
+    "native-rows.js",
+    "native-text.js",
+    "native-quantity.cjs",
+    "native-wonga.js",
+    "native-engine.js",
+    "native-find.js",
+]
+
+
+def run_js(code: str):
+    runner = f"""
+    const fs = require('fs'), vm = require('vm');
+    const ctx = vm.createContext({{ structuredClone, console }});
+    for (const f of {json.dumps(FILES)})
+      vm.runInContext(fs.readFileSync('tools/est-test/' + f, 'utf8'), ctx, {{ filename: f }});
+    ctx.project = JSON.parse(fs.readFileSync('tools/est-test/sample.json', 'utf8'));
+    process.stdout.write(JSON.stringify(vm.runInContext({json.dumps(code)}, ctx)));
+    """
+    out = subprocess.check_output(["node", "-e", runner], cwd=ROOT)
+    return json.loads(out.decode("utf-8"))
+
+
+def test_next_walks_matches_in_order_and_stops_at_end():
+    result = run_js("""(() => {
+      const rows = [{Name:'터파기'},{Name:'되메우기'},{Name:'잔토 터파기',Size:'백호'},{Name:'포장'}];
+      const first = EstFind.next(rows, '터파기', 0);
+      const second = EstFind.next(rows, '터파기', first + 1);
+      const end = EstFind.next(rows, '터파기', second + 1);
+      const spec = EstFind.next(rows, '백호', 0);
+      const loose = EstFind.next(rows, '  잔토  ', 0);
+      let empty = '';
+      try { EstFind.next(rows, '  ', 0); } catch (e) { empty = e.message; }
+      return {first, second, end, spec, loose, empty};
+    })()""")
+    assert result == {
+        "first": 0,
+        "second": 2,
+        "end": -1,
+        "spec": 2,
+        "loose": 2,
+        "empty": "검색어를 입력하세요.",
+    }
+
+
+def test_search_reads_cost_line_text_and_skips_previous_values():
+    result = run_js("""(() => {
+      const rows = [
+        {LineData:'\\x0e콘크리트\\x0e \\x13타설\\x13', Name_:'옛이름'},
+        {Name:'다른 행'}
+      ];
+      return {
+        line: EstFind.next(rows, '타설', 0),
+        old: EstFind.next(rows, '옛이름', 0)
+      };
+    })()""")
+    assert result == {"line": 0, "old": -1}
+
+
+def test_group_position_for_head_rows():
+    result = run_js("""(() => {
+      const rows = project.tables.HeadMainDat;
+      const titles = rows.map((r, i) => [i, r]).filter(([, r]) => Number(r.Index) > 0);
+      const [start, title] = titles[1];
+      const hit = EstFind.groupOf(rows, start + 1);
+      return {code: hit.code === title.Code, position: hit.position};
+    })()""")
+    assert result == {"code": True, "position": 1}