feat(Bangumi_Topic_Share): add animated custom tooltip for action buttons, bump version to 4.6

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

js/Bangumi_Topic_Share.js

@@ -1,7 +1,7 @@
 // ==UserScript==
 // @name         Bangumi Topic Share
 // @namespace    http://tampermonkey.net/
-// @version      4.5
+// @version      4.6
 // @description  Bangumi 话题分享工具：生成分享卡片，支持图片复制/下载、一键复制分享文案、可选 AI 标签
 // @author       Chang ji
 // @contributor  Stardream
@@ -69,6 +69,26 @@
         .bgm-action-btn:hover:not(:disabled) { background: rgba(255,255,255,0.3); transform: scale(1.1); }
         .bgm-action-btn:disabled { opacity: 0.3; cursor: default; }
         .bgm-action-btn svg { display: block; }
+        .bgm-action-btn::after {
+            content: attr(data-tip);
+            position: absolute;
+            top: calc(100% + 10px);
+            left: 50%;
+            transform: translateX(-50%) translateY(-6px);
+            background: rgba(20,20,20,0.82);
+            color: #fff;
+            font-size: 12px;
+            padding: 5px 12px;
+            border-radius: 8px;
+            white-space: nowrap;
+            opacity: 0;
+            pointer-events: none;
+            transition: opacity 0.18s ease, transform 0.18s ease;
+        }
+        .bgm-action-btn:hover:not(:disabled)::after {
+            opacity: 1;
+            transform: translateX(-50%) translateY(0);
+        }
 
         /* ===== 暗色主题 ===== */
         .share-card.dark { background: #1e1e1e; }
@@ -211,16 +231,16 @@
                 </div>
             </div>
             <div class="bgm-btn-row">
-                <button id="bgm-copy-btn" class="bgm-action-btn" disabled title="复制图片">
+                <button id="bgm-copy-btn" class="bgm-action-btn" disabled data-tip="复制图片">
                     <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="9" y="9" width="13" height="13" rx="2"/><path d="M5 15H4a2 2 0 0 1-2-2V4a2 2 0 0 1 2-2h9a2 2 0 0 1 2 2v1"/></svg>
                 </button>
-                <button id="bgm-download-btn" class="bgm-action-btn" disabled title="下载图片">
+                <button id="bgm-download-btn" class="bgm-action-btn" disabled data-tip="下载图片">
                     <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"/><polyline points="7 10 12 15 17 10"/><line x1="12" y1="15" x2="12" y2="3"/></svg>
                 </button>
-                <button id="bgm-text-btn" class="bgm-action-btn" title="复制文案">
+                <button id="bgm-text-btn" class="bgm-action-btn" data-tip="复制文案">
                     <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"/><polyline points="14 2 14 8 20 8"/><line x1="16" y1="13" x2="8" y2="13"/><line x1="16" y1="17" x2="8" y2="17"/><polyline points="10 9 9 9 8 9"/></svg>
                 </button>
-                <button id="bgm-close-btn" class="bgm-action-btn" title="关闭">
+                <button id="bgm-close-btn" class="bgm-action-btn" data-tip="关闭">
                     <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><line x1="18" y1="6" x2="6" y2="18"/><line x1="6" y1="6" x2="18" y2="18"/></svg>
                 </button>
             </div>