feat(awards): follow-list picker in Settings → Awards, filter the Awards tab

New per-profile "tracked awards" selection: Settings → Awards (under User
configuration) is a two-column transfer list — every defined award on the left,
the ones you follow on the right, click to move either way. The Awards tab's
list is narrowed to the followed set; an empty set means "show them all" so the
tab is never blank.

Backend: app_awards_tracked.go adds keyAwardsTracked (per-profile JSON array of
award codes) with GetTrackedAwards/SaveTrackedAwards; saving emits
awards:tracked-changed so the Awards tab re-filters live. Award definitions stay
global — only the follow selection is per profile.

app_awards_tracked.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+
+	wruntime "github.com/wailsapp/wails/v2/pkg/runtime"
+)
+
+// keyAwardsTracked holds the PER-PROFILE list of award codes the operator wants
+// to follow (JSON array of award.Def.Code). Award definitions themselves are
+// global (keyAwardDefs, shared across profiles), but WHICH awards a station
+// tracks is a per-profile choice — a DX profile follows DXCC/WPX, a POTA profile
+// follows POTA/WWFF. An empty/unset list means "track them all" so the Awards
+// tab is never blank before the operator has picked anything.
+const keyAwardsTracked = "awards.tracked"
+
+// GetTrackedAwards returns the active profile's followed award codes. An empty
+// slice means the operator has not narrowed the list — the Awards tab then shows
+// every award.
+func (a *App) GetTrackedAwards() ([]string, error) {
+	out := []string{}
+	if a.settings == nil {
+		return out, nil
+	}
+	s, _ := a.settings.Get(a.ctx, keyAwardsTracked)
+	if strings.TrimSpace(s) == "" {
+		return out, nil
+	}
+	if err := json.Unmarshal([]byte(s), &out); err != nil {
+		return []string{}, nil
+	}
+	return out, nil
+}
+
+// SaveTrackedAwards persists the followed award codes for the active profile and
+// notifies the Awards tab to re-filter its list. Codes are stored verbatim; the
+// Awards tab intersects them with the live award definitions, so a code that no
+// longer exists is simply ignored (not an error).
+func (a *App) SaveTrackedAwards(codes []string) error {
+	if a.settings == nil {
+		return fmt.Errorf("db not initialized")
+	}
+	if codes == nil {
+		codes = []string{}
+	}
+	b, err := json.Marshal(codes)
+	if err != nil {
+		return err
+	}
+	if err := a.settings.Set(a.ctx, keyAwardsTracked, string(b)); err != nil {
+		return err
+	}
+	wruntime.EventsEmit(a.ctx, "awards:tracked-changed")
+	return nil
+}