feat: ship v0.9.0 with pomodoro, achievements, and injection history

Add pomodoro timer with goal notifications, writing streak milestones, and knowledge injection logging with UI previews across AI writing flows.

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

src/renderer/components/knowledge/KnowledgePanel.tsx

@@ -13,6 +13,7 @@ import {
 export function KnowledgePanel(): React.JSX.Element {
   const { t } = useTranslation()
   const bookId = useBookStore((s) => s.currentBookId)
+  const chapters = useBookStore((s) => s.chapters)
   const selectedChapterId = useBookStore((s) => s.selectedChapterId)
   const extractThreshold = useSettingsStore((s) => s.knowledgeExtractConfidenceThreshold)
   const {
@@ -32,6 +33,8 @@ export function KnowledgePanel(): React.JSX.Element {
     extractChapter,
     batchApproveHighConfidence
   } = useKnowledgeStore()
+  const injectionPreviews = useKnowledgeStore((s) => s.injectionPreviews)
+  const loadInjectionPreviews = useKnowledgeStore((s) => s.loadInjectionPreviews)
   const [extracting, setExtracting] = useState(false)
   const [namingOpen, setNamingOpen] = useState(false)
   const [selected, setSelected] = useState<Set<string>>(new Set())
@@ -51,6 +54,14 @@ export function KnowledgePanel(): React.JSX.Element {
     )
   }, [bookId, entries])
 
+  useEffect(() => {
+    if (!bookId || entries.length === 0) return
+    void loadInjectionPreviews(
+      bookId,
+      entries.map((e) => e.id)
+    )
+  }, [bookId, entries, loadInjectionPreviews])
+
   const handleBatchApprove = async (): Promise<void> => {
     if (!bookId || selected.size === 0) return
     await batchApprove(bookId, [...selected])
@@ -188,6 +199,25 @@ export function KnowledgePanel(): React.JSX.Element {
                   </div>
                 )}
                 {entry.content && <div className="kb-item-content">{entry.content}</div>}
+                {(injectionPreviews[entry.id]?.length ?? 0) > 0 && (
+                  <div
+                    className="kb-injection-preview"
+                    data-testid={`knowledge-injection-preview-${entry.id}`}
+                  >
+                    <div className="kb-injection-label">{t('knowledge.injectionPreview')}</div>
+                    {injectionPreviews[entry.id]!.map((log) => (
+                      <div key={log.id} className="kb-injection-preview-row">
+                        {t('knowledge.injectionEntry', {
+                          date: new Date(log.injectedAt).toLocaleDateString(),
+                          mode: t(`knowledge.injectionMode.${log.flowMode}`),
+                          chapter:
+                            chapters.find((c) => c.id === log.chapterId)?.title ??
+                            t('knowledge.noChapter')
+                        })}
+                      </div>
+                    ))}
+                  </div>
+                )}
               </div>
               <div className="kb-item-actions">
                 {entry.status === 'pending' && bookId && (