Fix various legacy problems (#37092)

1.  Fix #36439
2. Fix #37089
3. Fix incorrect layout of admin auth oidc page
4. Fix #35866
5. Fix #35800
6. Fix #36243

routers/web/repo/release.go

@@ -451,6 +451,7 @@ func NewReleasePost(ctx *context.Context) {
 		return
 	}
 
+	form.Target = util.IfZero(form.Target, ctx.Repo.Repository.DefaultBranch)
 	if exist, _ := git_model.IsBranchExist(ctx, ctx.Repo.Repository.ID, form.Target); !exist {
 		ctx.RenderWithErrDeprecated(ctx.Tr("form.target_branch_not_exist"), tplReleaseNew, &form)
 		return
@@ -564,6 +565,11 @@ func EditRelease(ctx *context.Context) {
 		}
 		return
 	}
+	if rel.IsTag {
+		ctx.NotFound(err) // for a pure tag release, don't allow to edit it as a release
+		return
+	}
+
 	ctx.Data["ID"] = rel.ID
 	ctx.Data["tag_name"] = rel.TagName
 	ctx.Data["tag_target"] = util.IfZero(rel.Target, ctx.Repo.Repository.DefaultBranch)
@@ -613,7 +619,7 @@ func EditReleasePost(ctx *context.Context) {
 		return
 	}
 	if rel.IsTag {
-		ctx.NotFound(err)
+		ctx.NotFound(err) // for a pure tag release, don't allow to edit it as a release
 		return
 	}
 	ctx.Data["tag_name"] = rel.TagName