fix(editor): 修复 LaTeX 公式导致刷新后笔记内容丢失#116
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importService.ts 导出的 tiptapExtensions 与 TiptapEditor 实际使用的扩展集合 不一致：缺少 MathInline / MathBlock / FootnoteReference / FootnoteDefinition / TextAlign。该数组被 tiptapSchemaRepair.repairTiptapJson 复用做脏 JSON 修复。 事故链： 1. 用户在 RTE 插入 LaTeX 公式，编辑器持有的 JSON 含 mathInline/mathBlock 节点 2. onUpdate debounce 后正常保存到数据库 3. 刷新后 parseContent 调 repairTiptapJson 做 round-trip 4. generateHTML(json, tiptapExtensions) 内部 Node.fromJSON 遇到 schema 不识别 的 mathInline/mathBlock 节点，抛 RangeError: Invalid node type 5. catch 兜底返回 EMPTY_DOC，整篇笔记内容被清空 脚注同机制触发同样的"内容消失"；TextAlign 不消失但段落对齐会被静默丢失。 修复：把这几个扩展补齐到 importService.ts 的 tiptapExtensions，让这份 schema 与 TiptapEditor.tsx / contentFormat.ts 的扩展集合保持一致。 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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importService.ts 导出的 tiptapExtensions 与 TiptapEditor 实际使用的扩展集合 不一致：缺少 MathInline / MathBlock / FootnoteReference / FootnoteDefinition / TextAlign。该数组被 tiptapSchemaRepair.repairTiptapJson 复用做脏 JSON 修复。
事故链：
脚注同机制触发同样的"内容消失"；TextAlign 不消失但段落对齐会被静默丢失。
修复：把这几个扩展补齐到 importService.ts 的 tiptapExtensions，让这份 schema 与 TiptapEditor.tsx / contentFormat.ts 的扩展集合保持一致。