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>

modelmigration/migrations.go

@@ -439,6 +439,7 @@ func prepareMigrationTasks() []*migration {
 		newMigration(360, "Move branch protection settings to JSON", v29.MoveBranchProtectionConfigToJSON),
 		newMigration(361, "Drop legacy commit_id column from comment", v29.DropCommentCommitID),
 		newMigration(362, "Add reusable_workflow_ref column to action_run_job", v29.AddReusableWorkflowRefToActionRunJob),
+		newMigration(363, "Add release_id to reaction table", v29.AddReleaseIDToReaction),
 	}
 	return preparedMigrations
 }

modelmigration/v29/v363.go

@@ -0,0 +1,33 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package v29
+
+import (
+	"context"
+
+	"gitea.dev/modelmigration/base"
+	"gitea.dev/modules/timeutil"
+)
+
+func AddReleaseIDToReaction(_ctx context.Context, x base.EngineMigration) error {
+	// rows older than v123 can hold NULL, which the unique index doesn't treat as a duplicate of ''
+	if _, err := x.Exec("UPDATE reaction SET original_author = '' WHERE original_author IS NULL"); err != nil {
+		return err
+	}
+
+	type Reaction struct {
+		ID int64 `xorm:"pk autoincr"`
+
+		UserID           int64  `xorm:"UNIQUE(s) NOT NULL"` // first unique column implies INDEX
+		IssueID          int64  `xorm:"UNIQUE(s) INDEX(issue_comment) NOT NULL"`
+		CommentID        int64  `xorm:"UNIQUE(s) INDEX(issue_comment) INDEX NOT NULL"`
+		ReleaseID        int64  `xorm:"UNIQUE(s) INDEX NOT NULL DEFAULT(0)"`
+		OriginalAuthorID int64  `xorm:"UNIQUE(s) NOT NULL DEFAULT(0)"`
+		OriginalAuthor   string `xorm:"UNIQUE(s) NOT NULL DEFAULT('')"`
+		Type             string `xorm:"UNIQUE(s) NOT NULL"`
+
+		CreatedUnix timeutil.TimeStamp `xorm:"INDEX created"`
+	}
+	return x.Sync(new(Reaction))
+}