feat: add release reactions and a GitHub-like reaction bar (#38415)

Adds emoji reactions to releases and moves the reaction picker of
issues, comments and releases into a GitHub-like reaction bar.

- Releases omit 👎 or 😕
- Drafts and tags can't be reacted to
- Moved menu to tippy
- Added keyboard navigation

Fixes: https://github.com/go-gitea/gitea/issues/34268
Fixes: https://github.com/go-gitea/gitea/issues/16676
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

services/release/reaction.go

@@ -0,0 +1,33 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package release
+
+import (
+	"context"
+
+	issues_model "gitea.dev/models/issues"
+	repo_model "gitea.dev/models/repo"
+	user_model "gitea.dev/models/user"
+	"gitea.dev/modules/setting"
+)
+
+func AllowedReleaseReactions() []string {
+	return setting.UI.ReleaseReactions
+}
+
+func CreateReleaseReaction(ctx context.Context, doer *user_model.User, rel *repo_model.Release, content string) (*issues_model.Reaction, error) {
+	if err := rel.LoadRepo(ctx); err != nil {
+		return nil, err
+	}
+
+	if user_model.IsUserBlockedBy(ctx, doer, rel.PublisherID, rel.Repo.OwnerID) {
+		return nil, user_model.ErrBlockedUser
+	}
+
+	return issues_model.CreateReaction(ctx, setting.UI.ReleaseReactionsLookup, &issues_model.ReactionOptions{
+		Type:      content,
+		DoerID:    doer.ID,
+		ReleaseID: rel.ID,
+	})
+}