feat(pdf): PDF studio — merge / split / rotate (stage C item 4) - #77
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範圍照 handoff 與使用者確認：合併＋拆分＋旋轉，砍掉壓縮。 pdf-lib（新依賴）純前端處理，檔案不離開瀏覽器。 - src/lib/pdfPages.ts：頁碼範圍解析（TDD 5 tests）——「1-3, 7, 10-12」， 全形逗號／頓號容忍，超界或反向整串拒絕不猜意圖。 - src/lib/pdfOps.ts：合併／抽頁／旋轉（TDD 5 tests，用 pdf-lib 現做 PDF 驗頁數與旋轉角）；旋轉在原角度上累加 mod 360。 - src/tools/PdfStudio.tsx：三分頁——合併（多檔排序上移下移）、 拆分（範圍抽頁）、旋轉（90/180/270，可指定頁）；壞檔與加密檔 有明確錯誤訊息。 - 中英頁面、tools.ts 註冊（實用工具 📄）、OG 卡 74 張。 - e2e：現做 PDF 上傳，下載檔用 pdf-lib 回讀驗證頁數與旋轉角（+3）， 含錯誤頁碼的停用與提示。 測試：typecheck:api ✓ / 551 unit ✓（+10）/ 65 e2e ✓（+3） 純前端，不碰 api/。 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Scope confirmed with the user (per the handoff plan): merge + split + rotate, compression dropped. pdf-lib (new dependency) does everything client-side — files never leave the browser. - src/lib/pdfPages.ts: page-range parsing (TDD 5 tests) — "1-3, 7, 10-12", tolerant of full-width and CJK commas; out-of-range or reversed ranges reject the whole string instead of guessing intent. - src/lib/pdfOps.ts: merge / extract / rotate (TDD 5 tests that build real PDFs with pdf-lib and assert page counts and rotation angles); rotation adds to the existing page angle mod 360, since scans often carry one already. - src/tools/PdfStudio.tsx: three tabs — merge (multi-file with up/down reordering), split (range extraction), rotate (90/180/270, optional page range); clear errors for broken or password-protected files. - zh/en pages, tools.ts entry (📄), OG cards regenerated (74 total). - e2e: PDFs built on the fly, downloads re-parsed with pdf-lib to assert page counts and angles; invalid ranges disable the button with a visible message (+3). Tests: typecheck:api / 551 unit (+10) / 65 e2e (+3). Frontend only; api/ untouched. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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摘要
階段 C 第 4 項（範圍已與使用者確認：合併＋拆分＋旋轉，照 handoff 砍掉壓縮）。
pdf-lib（新依賴）純前端處理，檔案不離開瀏覽器，與全站隱私承諾一致。功能
驗證
api/🤖 Generated with Claude Code