fix(release): create download directories, refuse duplicate asset names and empty notes (follow gh)

Signed-off-by: bircni <bircni@icloud.com>

internal/app/releases.go

@@ -415,6 +415,9 @@ $ tea release edit v1.0.0-rc1 v1.0.0-rc2 --prerelease=false`,
 			if err != nil {
 				return err
 			}
+			if opts.Body != nil && *opts.Body == "" {
+				return clierr.Wrap(clierr.Usage, errors.New("release notes cannot be cleared; Gitea ignores empty notes"))
+			}
 			if cmd.Flags().Changed("tag") {
 				if len(args) != 1 || strings.TrimSpace(fields.tag) == "" {
 					return clierr.Wrap(clierr.Usage, errors.New("--tag requires one release and a nonempty new tag"))
@@ -439,6 +442,9 @@ $ tea release edit v1.0.0-rc1 v1.0.0-rc2 --prerelease=false`,
 				}
 				opts.Body = &editorDraft.Body
 			}
+			if editorDraft.Body == "" && fields.editor {
+				return clierr.Wrap(clierr.Usage, errors.New("release notes cannot be cleared; Gitea ignores empty notes"))
+			}
 			return batchDone(a, cmd, args, func(tag string) string { return "release " + tag }, func(tag string) (services.Release, error) {
 				item, err := service.View(cmd.Context(), tag)
 				if err != nil {