feat: importação de fatura de cartão — strip R$, skip negativos, all_expenses

Parser limpa prefixo R$ e símbolos de moeda antes de parsear o valor.
Flags SkipNegative e AllExpenses para CSV de fatura de cartão.
UI: checkboxes "Fatura de cartão" e "Ignorar valores negativos".

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

apps/api/internal/model/transaction.go

@@ -41,4 +41,6 @@ type CSVMapping struct {
 	HasHeader         bool   `json:"has_header"`
 	DecimalSeparator  string `json:"decimal_separator"` // "." or ","
 	FieldSeparator    string `json:"field_separator"`   // "," or ";"
+	SkipNegative      bool   `json:"skip_negative"`     // skip rows with negative amount (e.g. credit card bill payments)
+	AllExpenses       bool   `json:"all_expenses"`      // treat all rows as expense (credit card statements)
 }

apps/api/internal/parser/csv.go

@@ -57,24 +57,42 @@ func ParseCSV(r io.Reader, m model.CSVMapping) ([]model.ImportRow, []string) {
 		amtStr := strings.TrimSpace(record[m.AmountColumn])
 		desc := cleanDescription(record[m.DescriptionColumn])
 
+		// Skip blank rows (e.g. empty line after header in some bank exports)
+		if dateStr == "" && amtStr == "" && desc == "" {
+			continue
+		}
+
 		t, err := time.Parse(m.DateFormat, dateStr)
 		if err != nil {
 			errs = append(errs, fmt.Sprintf("linha %d: data inválida %q", lineNum, dateStr))
 			continue
 		}
 
+		// Strip currency symbols (R$, $, €, etc.) keeping digits, comma, dot, minus
+		cleaned := strings.Map(func(r rune) rune {
+			if r >= '0' && r <= '9' || r == ',' || r == '.' || r == '-' {
+				return r
+			}
+			return -1
+		}, amtStr)
+		cleaned = strings.TrimSpace(cleaned)
+
 		if m.DecimalSeparator == "," {
-			amtStr = strings.ReplaceAll(amtStr, ".", "")
-			amtStr = strings.ReplaceAll(amtStr, ",", ".")
+			cleaned = strings.ReplaceAll(cleaned, ".", "")
+			cleaned = strings.ReplaceAll(cleaned, ",", ".")
 		}
-		amt, err := strconv.ParseFloat(amtStr, 64)
-		if err != nil {
+		amt, err := strconv.ParseFloat(cleaned, 64)
+		if err != nil || cleaned == "" {
 			errs = append(errs, fmt.Sprintf("linha %d: valor inválido %q", lineNum, amtStr))
 			continue
 		}
 
+		if m.SkipNegative && amt < 0 {
+			continue
+		}
+
 		txType := "expense"
-		if amt > 0 {
+		if !m.AllExpenses && amt > 0 {
 			txType = "income"
 		}