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Implementare completa U5 din plan-treapta2.md (sectiunea 13): - _upload.html: drop zone + buton accesibil (a11y: drag nu e la tastatura), drag-and-drop JS, mesaj 'NU se trimite nimic pana confirmi', selector foi pt multi-sheet xlsx, stari eroare/mesaj - _mapcoloane.html: formular mapare coloane cu .maprow/.mapcol.grow, sugestii fuzzy pre-selectate, etiichete <label> vizibile, sample values, format data configurabil - _preview_import.html: tabel 6 stari, pills rezumat, filtre pe stare, .chk per-rand pe needs_review (D11), banner declarant .banner.warn direct deasupra input-ului N (D12), bara confirmare sticky, text 'dubla cu randul N' pe duplicate_in_file (D10 daltonism), link export CSV randuri esuate - base.html: .s-needs_review (warn), .s-already_sent/.s-duplicate_in_file (muted), .drop-zone, .banner.warn, .sticky-bar, .htmx-indicator - routes.py: rute /_import/upload/mapare-coloane/preview/reset/confirma; helper _web_compute_preview refoloseste _resolve_row_for_preview, _already_sent_lookup, _signature din import_router (fara a-l edita); commit ON CONFLICT DO NOTHING (TOCTOU); log atestare - tests/test_import_ui.py: 15 teste (dashboard, upload, mapare, preview, confirmare N corect/gresit, reset, erori, multi-sheet, a11y D10/D11/D12) 279 teste total, 0 esecuri. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>