music(player): 变速播放 + AB Loop

- 变速：底部 1× 圆形按钮循环切 0.5/0.75/1/1.25/1.5；preservesPitch=true（浏览器 native 保音高）；localStorage 持久化全局
- AB Loop：A B 两按钮在当前位置打点，🔁 开关；进度条上绿色高亮 A↔B 区段；timeupdate 触发 ≥B 跳回 A；切歌自动清 A/B

apps/articulate/frontend/public/wordlists/emotions.txt

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+easy - happy - 快乐
+easy - sad - 悲伤
+easy - angry - 生气
+easy - scared - 害怕
+easy - excited - 兴奋
+easy - tired - 疲倦
+easy - bored - 无聊
+easy - surprised - 惊讶
+easy - worried - 担心
+easy - nervous - 紧张
+easy - proud - 骄傲
+easy - shy - 害羞
+easy - brave - 勇敢
+easy - calm - 平静
+easy - confused - 困惑
+easy - curious - 好奇
+easy - disappointed - 失望
+easy - embarrassed - 尴尬
+easy - frustrated - 沮丧
+easy - grateful - 感激
+easy - guilty - 内疚
+easy - hopeful - 充满希望
+easy - jealous - 嫉妒
+easy - lonely - 孤独
+easy - loved - 被爱
+easy - mad - 疯狂
+easy - peaceful - 和平
+easy - relaxed - 放松
+easy - satisfied - 满意
+easy - shocked - 震惊
+easy - silly - 愚蠢
+easy - stressed - 压力大
+easy - uncomfortable - 不舒服
+easy - upset - 心烦
+easy - warm - 温暖
+easy - cold - 冷淡
+easy - cheerful - 愉快
+easy - gloomy - 阴郁
+easy - joyful - 欢乐
+easy - miserable - 痛苦
+easy - pleased - 高兴
+easy - unhappy - 不快乐
+easy - content - 满足
+easy - discontent - 不满
+easy - delighted - 高兴
+easy - depressed - 沮丧
+easy - elated - 兴高采烈
+easy - melancholy - 忧郁
+easy - enthusiastic - 热情
+easy - apathetic - 冷漠
+easy - optimistic - 乐观
+easy - pessimistic - 悲观
+easy - confident - 自信
+easy - insecure - 不安全
+easy - comfortable - 舒适
+easy - anxious - 焦虑
+easy - secure - 安全
+easy - threatened - 受威胁
+easy - safe - 安全
+easy - vulnerable - 脆弱
+easy - strong - 强大
+easy - weak - 虚弱
+easy - energetic - 精力充沛
+easy - lethargic - 无精打采
+easy - alert - 警觉
+easy - drowsy - 昏昏欲睡
+easy - awake - 清醒
+easy - sleepy - 困倦
+medium - ecstatic - 狂喜
+medium - despondent - 沮丧
+medium - furious - 愤怒
+medium - terrified - 恐惧
+medium - thrilled - 激动
+medium - exhausted - 筋疲力尽
+medium - indifferent - 漠不关心
+medium - astonished - 惊讶
+medium - concerned - 关心
+medium - tense - 紧张
+medium - arrogant - 傲慢
+medium - timid - 胆怯
+medium - courageous - 勇敢
+medium - serene - 宁静
+medium - bewildered - 困惑
+medium - inquisitive - 好奇
+medium - disheartened - 灰心
+medium - mortified - 羞愧
+medium - exasperated - 恼怒
+medium - thankful - 感谢
+medium - remorseful - 懊悔
+medium - encouraged - 鼓励
+medium - envious - 羡慕
+medium - isolated - 孤立
+medium - cherished - 珍爱
+medium - irate - 愤怒
+medium - tranquil - 平静
+medium - composed - 镇定
+medium - fulfilled - 满足
+medium - appalled - 震惊
+medium - playful - 顽皮
+medium - overwhelmed - 不知所措
+medium - awkward - 尴尬
+medium - agitated - 激动
+medium - affectionate - 深情
+medium - distant - 疏远
+medium - jovial - 愉快
+medium - somber - 阴郁
+medium - jubilant - 欢腾
+medium - wretched - 悲惨
+medium - gratified - 满意
+medium - displeased - 不悦
+medium - contented - 满足
+medium - dissatisfied - 不满
+medium - overjoyed - 欣喜若狂
+medium - dejected - 沮丧
+medium - euphoric - 欣快
+medium - mournful - 悲哀
+medium - passionate - 热情
+medium - dispassionate - 冷静
+medium - sanguine - 乐观
+medium - cynical - 愤世嫉俗
+medium - assured - 确信
+medium - doubtful - 怀疑
+medium - cozy - 舒适
+medium - uneasy - 不安
+medium - protected - 受保护
+medium - endangered - 濒危
+medium - sheltered - 庇护
+medium - exposed - 暴露
+medium - robust - 强健
+medium - frail - 虚弱
+medium - vigorous - 充满活力
+medium - sluggish - 迟钝
+medium - attentive - 专注
+medium - distracted - 分心
+medium - conscious - 有意识
+medium - unconscious - 无意识
+medium - refreshed - 精神焕发
+medium - fatigued - 疲劳
+medium - invigorated - 充满活力
+medium - drained - 精疲力竭
+medium - stimulated - 刺激
+medium - numbed - 麻木
+medium - animated - 活跃
+medium - lifeless - 无生气
+medium - spirited - 精神饱满
+medium - dispirited - 沮丧
+medium - buoyant - 轻快
+medium - heavy-hearted - 心情沉重
+medium - lighthearted - 轻松愉快
+medium - downcast - 沮丧
+medium - uplifted - 振奋
+medium - dejected - 沮丧
+medium - inspired - 受启发
+medium - uninspired - 缺乏灵感
+medium - motivated - 有动力
+medium - unmotivated - 没有动力
+medium - determined - 坚定
+medium - hesitant - 犹豫
+medium - resolute - 坚决
+medium - wavering - 动摇
+medium - steadfast - 坚定
+medium - vacillating - 摇摆不定
+medium - decisive - 果断
+medium - indecisive - 优柔寡断
+medium - bold - 大胆
+medium - cautious - 谨慎
+medium - daring - 勇敢
+medium - wary - 警惕
+medium - adventurous - 冒险
+medium - conservative - 保守
+medium - spontaneous - 自发
+medium - calculated - 精心计算
+medium - impulsive - 冲动
+medium - deliberate - 深思熟虑
+medium - reckless - 鲁莽
+medium - prudent - 谨慎
+medium - carefree - 无忧无虑
+medium - burdened - 负担
+medium - untroubled - 无忧
+medium - troubled - 烦恼
+medium - unperturbed - 镇定
+medium - perturbed - 不安
+medium - undisturbed - 不受干扰
+medium - disturbed - 不安
+medium - unruffled - 镇定
+medium - ruffled - 不安
+medium - unflappable - 镇定
+medium - flustered - 慌乱
+hard - euphoric - 欣快
+hard - dysphoric - 烦躁
+hard - elated - 兴高采烈
+hard - crestfallen - 垂头丧气
+hard - incensed - 激怒
+hard - petrified - 吓呆
+hard - exhilarated - 兴奋
+hard - enervated - 衰弱
+hard - nonchalant - 漠不关心
+hard - flabbergasted - 目瞪口呆
+hard - apprehensive - 忧虑
+hard - fraught - 焦虑
+hard - haughty - 傲慢
+hard - diffident - 缺乏自信
+hard - valiant - 英勇
+hard - placid - 平静
+hard - perplexed - 困惑
+hard - intrigued - 好奇
+hard - crestfallen - 沮丧
+hard - abashed - 羞愧
+hard - vexed - 恼怒
+hard - appreciative - 感激
+hard - contrite - 悔恨
+hard - buoyed - 振奋
+hard - covetous - 贪婪
+hard - ostracized - 排斥
+hard - adored - 崇拜
+hard - livid - 愤怒
+hard - equanimous - 平静
+hard - poised - 镇定
+hard - satiated - 满足
+hard - aghast - 惊骇
+hard - whimsical - 异想天开
+hard - beleaguered - 困扰
+hard - sheepish - 羞怯
+hard - perturbed - 不安
+hard - tender - 温柔
+hard - aloof - 冷漠
+hard - ebullient - 热情洋溢
+hard - lugubrious - 悲哀
+hard - rapturous - 狂喜
+hard - abject - 悲惨
+hard - appeased - 平息
+hard - irked - 恼怒
+hard - sated - 满足
+hard - malcontent - 不满
+hard - transported - 狂喜
+hard - forlorn - 孤独
+hard - rhapsodic - 狂喜
+hard - plaintive - 哀伤
+hard - fervent - 热情
+hard - phlegmatic - 冷静
+hard - buoyant - 乐观
+hard - sardonic - 讽刺
+hard - self-assured - 自信
+hard - diffident - 缺乏自信
+hard - snug - 舒适
+hard - disquieted - 不安
+hard - fortified - 加强
+hard - imperiled - 危险
+hard - ensconced - 安置
+hard - vulnerable - 脆弱
+hard - stalwart - 坚定
+hard - infirm - 虚弱
+hard - ebullient - 热情洋溢
+hard - torpid - 迟钝
+hard - vigilant - 警惕
+hard - oblivious - 忘记
+hard - lucid - 清醒
+hard - stuporous - 昏迷
+hard - rejuvenated - 恢复活力
+hard - debilitated - 虚弱
+hard - galvanized - 激励
+hard - enervated - 衰弱
+hard - aroused - 唤醒
+hard - desensitized - 麻木
+hard - vivacious - 活泼
+hard - moribund - 垂死
+hard - effervescent - 活跃
+hard - languid - 无精打采
+hard - resilient - 有弹性
+hard - disconsolate - 忧郁
+hard - blithe - 快乐
+hard - doleful - 悲哀
+hard - exalted - 高兴
+hard - abased - 降低
+hard - emboldened - 鼓励
+hard - daunted - 气馁
+hard - galvanized - 激励
+hard - demoralized - 士气低落
+hard - tenacious - 坚韧
+hard - irresolute - 优柔寡断
+hard - unwavering - 坚定
+hard - faltering - 犹豫
+hard - intrepid - 无畏
+hard - timorous - 胆怯
+hard - audacious - 大胆
+hard - circumspect - 谨慎
+hard - venturesome - 冒险
+hard - risk-averse - 规避风险
+hard - extemporaneous - 即兴
+hard - premeditated - 预谋
+hard - precipitate - 仓促
+hard - judicious - 明智
+hard - foolhardy - 鲁莽
+hard - sagacious - 睿智
+hard - insouciant - 漫不经心
+hard - encumbered - 负担
+hard - unencumbered - 无负担
+hard - vexed - 烦恼
+hard - imperturbable - 镇定
+hard - agitated - 激动
+hard - tranquil - 平静
+hard - discomposed - 不安
+hard - unperturbed - 镇定
+hard - disconcerted - 不安
+hard - composed - 镇定
+hard - flustered - 慌乱
+