Add ticket time tracking with reports and entry management.

Support start/stop timer, manual durations, grouped reports, and per-ticket edit/delete of time entries with undo.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/ticket/duration.go

@@ -0,0 +1,59 @@
+package ticket
+
+import (
+	"fmt"
+	"regexp"
+	"strconv"
+	"strings"
+	"time"
+)
+
+var (
+	reHourMin  = regexp.MustCompile(`(?i)^(\d+)\s*h(?:ours?)?\s*(\d+)\s*m(?:ins?)?$`)
+	reHourOnly = regexp.MustCompile(`(?i)^(\d+(?:\.\d+)?)\s*h(?:ours?)?$`)
+	reMinOnly  = regexp.MustCompile(`(?i)^(\d+)\s*m(?:ins?)?$`)
+	reSecOnly  = regexp.MustCompile(`(?i)^(\d+)\s*s(?:ecs?)?$`)
+	reColon    = regexp.MustCompile(`^(\d+):(\d{1,2})$`)
+)
+
+// ParseDurationFlexible parses user durations like 1h30m, 90m, 1.5h, 1:30.
+func ParseDurationFlexible(s string) (time.Duration, error) {
+	s = strings.TrimSpace(s)
+	if s == "" {
+		return 0, fmt.Errorf("duration required")
+	}
+	// Prefer Go's parser when it works (e.g. 1h30m, 90m).
+	if d, err := time.ParseDuration(strings.ToLower(s)); err == nil && d > 0 {
+		return d, nil
+	}
+
+	if m := reHourMin.FindStringSubmatch(s); m != nil {
+		h, _ := strconv.Atoi(m[1])
+		min, _ := strconv.Atoi(m[2])
+		return time.Duration(h)*time.Hour + time.Duration(min)*time.Minute, nil
+	}
+	if m := reHourOnly.FindStringSubmatch(s); m != nil {
+		h, err := strconv.ParseFloat(m[1], 64)
+		if err != nil {
+			return 0, fmt.Errorf("invalid duration %q", s)
+		}
+		return time.Duration(h * float64(time.Hour)), nil
+	}
+	if m := reMinOnly.FindStringSubmatch(s); m != nil {
+		min, _ := strconv.Atoi(m[1])
+		return time.Duration(min) * time.Minute, nil
+	}
+	if m := reSecOnly.FindStringSubmatch(s); m != nil {
+		sec, _ := strconv.Atoi(m[1])
+		return time.Duration(sec) * time.Second, nil
+	}
+	if m := reColon.FindStringSubmatch(s); m != nil {
+		h, _ := strconv.Atoi(m[1])
+		min, _ := strconv.Atoi(m[2])
+		if min >= 60 {
+			return 0, fmt.Errorf("invalid minutes in %q", s)
+		}
+		return time.Duration(h)*time.Hour + time.Duration(min)*time.Minute, nil
+	}
+	return 0, fmt.Errorf("invalid duration %q (try 1h30m, 90m, 1.5h)", s)
+}