修复文本收藏/聊天记录检索不识别已撤回状态、P2P来源收藏名称解析404

问题13（收藏availability恒为available）后端修复后暴露的真实缺口：
text类型收藏和History的history-search结果都只判断item.type，从不看
availability，撤回的文本消息会原样一直显示旧内容（History里甚至会
显示后端messageText()对nil content兜底出的字面量"null"）。

另外，P2P来源的收藏来源名称解析函数把复合p2p话题id当用户uid传给
/users/{id}/profile，必现404，永远显示原始话题字符串而非好友昵称；
改用已有的getConversationContext接口正确解析。

第十一轮最小粒度测试 Ch7 发现。

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

css/base.css

@@ -11064,13 +11064,18 @@ div.toast.show {
   white-space: nowrap;
 }
 
-/* Shared by VoiceCard/LinkText/MediaThumb's "removed" state (content-library-view.jsx) -- same
-   opacity + red label language as .library-file-card.removed/em above, but these three don't share
+/* Shared by VoiceCard/LinkText/MediaThumb/text-favorite's "removed" state (content-library-view.jsx)
+   -- same opacity + red label language as .library-file-card.removed/em above, but these don't share
    its grid layout (voice/media assume an icon+waveform or an image backdrop that isn't there once
-   the source message is gone), so the removed state uses a simple centered flex row instead. */
+   the source message is gone), so the removed state uses a simple centered flex row instead.
+   .library-text-content.removed covers a recalled/deleted *text* favorite or history-search hit --
+   plain text has no dedicated wrapper component of its own (FavoriteItem/History render it inline),
+   so the same modifier class is applied straight to the existing <p className="library-text-content">
+   rather than introducing a whole new component just for this one state. */
 .library-voice-card.removed,
 .library-link-text.removed,
-.library-media-thumb.removed {
+.library-media-thumb.removed,
+.library-text-content.removed {
   display: flex;
   align-items: center;
   justify-content: center;
@@ -11080,7 +11085,8 @@ div.toast.show {
 
 .library-voice-card.removed em,
 .library-link-text.removed em,
-.library-media-thumb.removed em {
+.library-media-thumb.removed em,
+.library-text-content.removed em {
   color: #d74a53;
   font-size: 0.74rem;
   font-style: normal;