feat(parse): report per-sheet recognition and block error sheets

- parseWorkbook returns a report per sheet (table counts, issues, ok)
- sheets with E-level issues cannot be selected (spec section 2.3)
- pier input carries its source sheet name

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

src/core/parseWorkbook.ts

@@ -5,24 +5,50 @@ import type { Bearing, FoundationType, Issue, IpPoint, PierInput, PierType, Row
 type Cell = string | number | null | undefined;
 type Grid = Cell[][];
 
+export interface SheetReport {
+  name: string;
+  /** Pier input tables found (교각 정보 표 개수). */
+  tables: { pier: number; ip: number; bearing: number };
+  piers: number;
+  issues: Issue[];
+  /** A sheet with any E-level issue cannot be selected (spec §2.3). */
+  ok: boolean;
+}
+
 export interface ParseResult {
   piers: PierInput[];
   issues: Issue[];
+  sheets: SheetReport[];
 }
 
 const PIER_TYPES: PierType[] = ['T형', '2주형', '3주형'];
 const FOUNDATION_TYPES: FoundationType[] = ['말뚝기초', '직접기초', '현장타설말뚝'];
 
-/** Reads every sheet and collects the pier tables found by their header strings (position-independent). */
+/** Reads every sheet, finds the pier tables by their header strings, and reports each sheet separately. */
 export function parseWorkbook(wb: XLSX.WorkBook): ParseResult {
   const piers: PierInput[] = [];
   const issues: Issue[] = [];
+  const sheets: SheetReport[] = [];
   for (const sheetName of wb.SheetNames) {
     const ws = wb.Sheets[sheetName];
     const grid = XLSX.utils.sheet_to_json<Cell[]>(ws, { header: 1, raw: true, defval: null }) as Grid;
-    piers.push(...parseSheet(grid, sheetName, issues));
+    const sheetIssues: Issue[] = [];
+    const found = parseSheet(grid, sheetName, sheetIssues);
+    piers.push(...found);
+    issues.push(...sheetIssues);
+    sheets.push({
+      name: sheetName,
+      tables: {
+        pier: findHeaders(grid, (r) => r[0] === '교각명' && r[1] === '교각형식').length,
+        ip: findHeaders(grid, (r) => r[0] === '교각명' && r[1] === 'IP점').length,
+        bearing: findHeaders(grid, (r) => r[0] === '교각명' && r[1] === '받침번호').length,
+      },
+      piers: found.length,
+      issues: sheetIssues,
+      ok: found.length > 0 && !sheetIssues.some((i) => i.level === 'E'),
+    });
   }
-  return { piers, issues };
+  return { piers, issues, sheets };
 }
 
 function parseSheet(grid: Grid, sheet: string, issues: Issue[]): PierInput[] {
@@ -61,18 +87,19 @@ function parseSheet(grid: Grid, sheet: string, issues: Issue[]): PierInput[] {
           code: 'E03',
           level: 'E',
           pier: name,
-          message: `${sheet} ${bad.row}행: 방위각 문자열을 읽을 수 없습니다. 예: 75°56'55.9"`,
+          message: `${bad.row}행: 방위각을 읽을 수 없습니다. 예: 75°56'55.9" 형식으로 고치세요.`,
         });
         continue;
       }
       const type = String(cells[1]) as PierType;
       const foundation = String(cells[5]) as FoundationType;
       if (!PIER_TYPES.includes(type) || !FOUNDATION_TYPES.includes(foundation)) {
-        issues.push({ code: 'E01', level: 'E', pier: name, message: `${sheet} ${index + 1}행: 교각형식 또는 기초 형식을 알 수 없습니다.` });
+        issues.push({ code: 'E01', level: 'E', pier: name, message: `${index + 1}행: 교각형식 또는 기초 형식을 알 수 없습니다.` });
         continue;
       }
       piers.push({
         name,
+        sheet,
         type,
         copingTopEl: Number(cells[2]),
         footingBottomEl: Number(cells[3]),