chore: migrate mail themes to shared framework and locked upstream inputs

tools/config/config.go

@@ -12,7 +12,7 @@ import (
 type TemplateConfig struct {
 	Name   string         `json:"name"`
 	Desc   string         `json:"desc"`
-	Path   []string       `json:"path"`
+	Path   []string       `json:"-"` // Discovered from the pinned upstream snapshot.
 	Params map[string]any `json:"params"`
 }
 
@@ -29,7 +29,9 @@ func Load(path string) (*TemplatesConfig, error) {
 	}
 
 	var cfg TemplatesConfig
-	if err := json.Unmarshal(data, &cfg); err != nil {
+	decoder := json.NewDecoder(strings.NewReader(string(data)))
+	decoder.UseNumber()
+	if err := decoder.Decode(&cfg); err != nil {
 		return nil, fmt.Errorf("cannot parse config file %s: %w", path, err)
 	}
 
@@ -37,9 +39,36 @@ func Load(path string) (*TemplatesConfig, error) {
 		return nil, fmt.Errorf("config file %s contains no template definitions", path)
 	}
 
+	for id, t := range cfg.Templates {
+		t.Params = normalizeNumbers(t.Params).(map[string]any)
+		cfg.Templates[id] = t
+	}
 	return &cfg, nil
 }
 
+func normalizeNumbers(v any) any {
+	switch v := v.(type) {
+	case json.Number:
+		if n, err := v.Int64(); err == nil {
+			return n
+		}
+		n, _ := v.Float64()
+		return n
+	case map[string]any:
+		for k, value := range v {
+			v[k] = normalizeNumbers(value)
+		}
+		return v
+	case []any:
+		for i, value := range v {
+			v[i] = normalizeNumbers(value)
+		}
+		return v
+	default:
+		return v
+	}
+}
+
 // PathStr returns the file path of a template definition joined with OS separator.
 func (t *TemplateConfig) PathStr() string {
 	return filepath.Join(t.Path...)