feat: ship v0.8.0 with writing logs and AI knowledge extraction

Deliver P5.2 writing day logs, cockpit heatmap, streak tracking, and chapter knowledge auto-extraction with merge review.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/main/services/knowledge-extraction-prompt.ts

@@ -0,0 +1,45 @@
+import type { ExtractedKnowledgeItem } from '../../shared/types'
+
+export function buildExtractionPrompt(
+  chapterTitle: string,
+  plainText: string,
+  approvedTitles: Array<{ id: string; title: string }>
+): string {
+  const catalog =
+    approvedTitles.length > 0
+      ? approvedTitles.map((e) => `- ${e.id}: ${e.title}`).join('\n')
+      : '（无）'
+  return `你是小说知识库助手。请从以下章节正文中抽取知识条目，输出 JSON 数组。
+
+章节标题：${chapterTitle}
+
+已有 approved 知识（id: 标题）：
+${catalog}
+
+若某条抽取内容是对已有知识的更新，请设置 suggestedMergeId 为对应 id，并在 proposedPatch 中给出建议更新的字段。
+
+每条必须包含：type（character|foreshadow|relationship|location|fact）、title、content、importance(1-5)、confidence(0-1)、foreshadowStatus（仅 foreshadow 类型：buried|partial|resolved）。
+
+正文：
+${plainText}
+
+仅返回 JSON 数组，不要 markdown。`
+}
+
+export function parseExtractionJson(raw: string): ExtractedKnowledgeItem[] {
+  const cleaned = raw.replace(/```json\n?|\n?```/g, '').trim()
+  const arr = JSON.parse(cleaned) as ExtractedKnowledgeItem[]
+  if (!Array.isArray(arr)) throw new Error('expected array')
+  return arr
+    .map((item) => ({
+      type: item.type,
+      title: String(item.title).trim(),
+      content: String(item.content ?? '').trim(),
+      importance: item.importance ?? 3,
+      confidence: Number(item.confidence) || 0.5,
+      foreshadowStatus: item.foreshadowStatus,
+      suggestedMergeId: item.suggestedMergeId ?? undefined,
+      proposedPatch: item.proposedPatch
+    }))
+    .filter((x) => x.title.length > 0)
+}