feat: share env files as encrypted links

S → f on a repo, an env file or a key in one copies a
lazysecrets://share link holding the env files, encrypted (age) with
a secret's value: whoever can read that secret can open it. The key is
share.key in the repo's .lazysecrets.yaml, else in the config, else
picked when sharing; on Azure the link pins its version. Opening one
says what it holds, decrypts when asked, and saves the files in the
clone of the repo (or a folder chosen), replacing existing ones only
when asked. lazysecrets share prints a link from the command line.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

internal/provider/azure/azure.go

@@ -453,11 +453,8 @@ func (p *Provider) Value(ctx context.Context, o provider.Object) (provider.Secre
 	}
 	switch o.Type {
 	case provider.TypeSecret:
-		resp, err := vc.secrets.GetSecret(ctx, o.Name, o.Version, nil)
-		if err != nil {
-			return provider.SecretValue{}, cleanError(err)
-		}
-		return provider.NewSecretValue([]byte(deref(resp.Value))), nil
+		v, _, err := p.VersionedValue(ctx, o)
+		return v, err
 	case provider.TypeKey:
 		resp, err := vc.keys.GetKey(ctx, o.Name, o.Version, nil)
 		if err != nil {
@@ -481,7 +478,31 @@ func (p *Provider) Value(ctx context.Context, o provider.Object) (provider.Secre
 	return provider.SecretValue{}, provider.ErrUnsupported
 }
 
-var _ provider.Locator = (*Provider)(nil)
+// VersionedValue is Value, with the version read.
+func (p *Provider) VersionedValue(ctx context.Context, o provider.Object) (provider.SecretValue, string, error) {
+	if o.Type != provider.TypeSecret {
+		v, err := p.Value(ctx, o)
+		return v, o.Version, err
+	}
+	vc, err := p.clients(o.Container.Detail)
+	if err != nil {
+		return provider.SecretValue{}, "", err
+	}
+	resp, err := vc.secrets.GetSecret(ctx, o.Name, o.Version, nil)
+	if err != nil {
+		return provider.SecretValue{}, "", cleanError(err)
+	}
+	version := o.Version
+	if resp.ID != nil {
+		version = resp.ID.Version()
+	}
+	return provider.NewSecretValue([]byte(deref(resp.Value))), version, nil
+}
+
+var (
+	_ provider.Locator   = (*Provider)(nil)
+	_ provider.Versioned = (*Provider)(nil)
+)
 
 // validHost guards the Resource Graph query against odd input.
 var validHost = regexp.MustCompile(`^[a-z0-9.-]+$`)