feat(view): 도면 불러오기 — read the bearing drawing values from an xlsx or csv sheet on ②

The sheet needs the header names No, EL.X, h1 and h2 (case, spaces, dots and units in parentheses are ignored). Rows are
checked: No must be a unique positive integer, EL.X must be in metres (30–100), h1 and h2 must be positive mm up to 1000.
Any error stops the import with the first messages; a valid sheet fills this pier's drawing values and regenerates the
pier. The parser is pure and tested.

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

tests/drawing-import.test.ts

@@ -0,0 +1,32 @@
+import { describe, expect, it } from 'vitest';
+import { parseDrawingRows } from '../src/core/drawing-import';
+
+const header = ['No', '열', 'EL.X (m)', 'h1 (mm)', 'h2 (mm)'];
+
+describe('도면 불러오기 (승인 2026-10-23)', () => {
+  it('reads No, EL.X, h1, h2 from a sheet with a header and ignores other columns', () => {
+    const rows = [['도면 받침', '', '', '', ''], header, [1, '전열', 43.625, 164, 50], [2, '전열', 43.697, 164, 50]];
+    const r = parseDrawingRows(rows);
+    expect(r.errors).toEqual([]);
+    expect(r.rows).toEqual([
+      { no: 1, elx: 43.625, h1: 164, h2: 50 },
+      { no: 2, elx: 43.697, h1: 164, h2: 50 },
+    ]);
+  });
+
+  it('accepts the header spelled as "EL. X" and in a different order', () => {
+    const rows = [['h2', 'No', 'h1', 'EL. X'], [50, 1, 164, 43.625]];
+    const r = parseDrawingRows(rows);
+    expect(r.errors).toEqual([]);
+    expect(r.rows[0]).toEqual({ no: 1, elx: 43.625, h1: 164, h2: 50 });
+  });
+
+  it('reports a missing header, a duplicate No, and an EL.X given in mm', () => {
+    expect(parseDrawingRows([['x', 'y']]).errors[0]).toContain('머리글');
+    const dup = parseDrawingRows([header, [1, '', 43.6, 164, 50], [1, '', 43.7, 164, 50]]);
+    expect(dup.errors.some((e) => e.includes('중복'))).toBe(true);
+    const mm = parseDrawingRows([header, [1, '', 43625, 164, 50]]);
+    expect(mm.errors.some((e) => e.includes('m 단위'))).toBe(true);
+    expect(mm.rows).toEqual([]);
+  });
+});