feat: filter award references by mode class

All / CW / Phone / Digital, stacked on top of the worked/confirmed filter. The
question an operator actually has — which DXCC entities have I worked on CW but
not confirmed on CW — needs both at once; answering only one of them is what
sends people to a spreadsheet.

References carried bands but not modes, so the award computation now aggregates
mode CLASSES per reference, worked and confirmed separately. Classes, not ADIF
modes: nobody chasing CW cares whether the digital side was FT8 or RTTY, and a
list of twenty mode names would not answer the question. An unrecognised mode
counts as data rather than as nothing, so a new digital mode does not vanish
from the filter the day it appears.

Two rules the filter needs to be honest:

  - Not-confirmed means not confirmed ON THIS MODE. An entity worked on CW and
    confirmed on SSB is still a CW entity to chase, and that is exactly what the
    filter is for.
  - "Not worked" plus a mode is a contradiction — an unworked reference has no
    mode — so the mode filter stands aside there instead of emptying the list.

internal/award/award.go

@@ -334,13 +334,19 @@ type BandCount struct {
 
 // Ref is one reference's status within an award.
 type Ref struct {
-	Ref            string   `json:"ref"`
-	Name           string   `json:"name,omitempty"`
-	Group          string   `json:"group,omitempty"`
-	SubGrp         string   `json:"subgrp,omitempty"`
-	Worked         bool     `json:"worked"`
-	Confirmed      bool     `json:"confirmed"`
-	Validated      bool     `json:"validated"`
+	Ref       string `json:"ref"`
+	Name      string `json:"name,omitempty"`
+	Group     string `json:"group,omitempty"`
+	SubGrp    string `json:"subgrp,omitempty"`
+	Worked    bool   `json:"worked"`
+	Confirmed bool   `json:"confirmed"`
+	Validated bool   `json:"validated"`
+	// Modes / ConfirmedModes are CLASSES, not ADIF modes: "CW", "PHONE",
+	// "DIGI". An operator asking "which entities have I worked on CW but not
+	// confirmed" does not care whether it was FT8 or RTTY on the digital side,
+	// and a list of twenty mode names would not answer the question they asked.
+	Modes          []string `json:"modes"`
+	ConfirmedModes []string `json:"confirmed_modes"`
 	Bands          []string `json:"bands"`
 	ConfirmedBands []string `json:"confirmed_bands"`
 	ValidatedBands []string `json:"validated_bands"`
@@ -360,11 +366,33 @@ type Result struct {
 	Error     string      `json:"error,omitempty"` // e.g. bad regexp pattern
 }
 
+// ModeClass sorts an ADIF mode into the three classes an operator thinks in:
+// CW, PHONE, DIGI. Anything unrecognised returns "" and is simply not counted
+// under any class — better than inventing one, since these classes drive a
+// filter that decides what the operator is shown.
+func ModeClass(mode string) string {
+	switch strings.ToUpper(strings.TrimSpace(mode)) {
+	case "CW", "CWR":
+		return "CW"
+	case "SSB", "USB", "LSB", "AM", "FM", "DV", "PHONE", "DIGITALVOICE":
+		return "PHONE"
+	case "":
+		return ""
+	}
+	// Everything else that a logbook actually carries is a data mode: FT8, FT4,
+	// RTTY, PSK31, JS8, Q65, MSK144, OLIVIA, VARA… Listing them exhaustively
+	// would mean a new mode silently vanishing from the filter the day it
+	// appears, which is worse than treating an unknown data mode as data.
+	return "DIGI"
+}
+
 // NameResolver optionally maps a (field, ref) pair to a human name. May be nil.
 type NameResolver func(field, ref string) string
 
 type refAgg struct {
 	bands          map[string]struct{}
+	modes          map[string]struct{}
+	confirmedModes map[string]struct{}
 	confirmedBands map[string]struct{}
 	validatedBands map[string]struct{}
 	anyConfirmed   bool
@@ -481,22 +509,33 @@ func Compute(defs []Def, qsos []qso.QSO, refMetas map[string][]RefMeta, nameOf N
 				continue
 			}
 			band := strings.ToLower(strings.TrimSpace(q.Band))
+			modeClass := ModeClass(q.Mode)
 			isConf := confirmed(q, d.Confirm)
 			isVal := confirmed(q, d.Validate)
 			for _, ref := range refs {
 				a := agg[i][ref]
 				if a == nil {
-					a = &refAgg{bands: map[string]struct{}{}, confirmedBands: map[string]struct{}{}, validatedBands: map[string]struct{}{}}
+					a = &refAgg{
+						bands: map[string]struct{}{}, confirmedBands: map[string]struct{}{},
+						validatedBands: map[string]struct{}{},
+						modes:          map[string]struct{}{}, confirmedModes: map[string]struct{}{},
+					}
 					agg[i][ref] = a
 				}
 				if band != "" {
 					a.bands[band] = struct{}{}
 				}
+				if modeClass != "" {
+					a.modes[modeClass] = struct{}{}
+				}
 				if isConf {
 					a.anyConfirmed = true
 					if band != "" {
 						a.confirmedBands[band] = struct{}{}
 					}
+					if modeClass != "" {
+						a.confirmedModes[modeClass] = struct{}{}
+					}
 				}
 				if isVal {
 					a.anyValidated = true
@@ -525,6 +564,7 @@ func Compute(defs []Def, qsos []qso.QSO, refMetas map[string][]RefMeta, nameOf N
 				r.Validated++
 			}
 			rf := Ref{Ref: ref, Worked: true, Confirmed: a.anyConfirmed, Validated: a.anyValidated,
+				Modes: setToSorted(a.modes), ConfirmedModes: setToSorted(a.confirmedModes),
 				Bands: setToSorted(a.bands), ConfirmedBands: setToSorted(a.confirmedBands), ValidatedBands: setToSorted(a.validatedBands)}
 			labelRef(&rf, d, ref, rl, hasList, nameOf)
 			r.Refs = append(r.Refs, rf)