feat: show incomplete Magic Notes todo counts

Magic Notes can now show a default-on incomplete todo badge in the primary
navigation. The badge hides at zero, caps its visual label at 99+ while
retaining the exact accessible count, and refreshes after user or Agent/MCP
note changes.

Platform Features > Magic Notes includes a persistent switch that hides only
the count without changing notes or the Magic Notes entry. Existing settings
migrate with the count enabled.

Release note: 左侧“魔法笔记”入口现在可显示未完成待办数量；可在“平台功能 → 魔法笔记”中关闭，超过 99 项显示“99+”。

src/shared/application-settings-contracts.ts

@@ -30,6 +30,7 @@ const applicationPreferencesSchema = z
     updateSource: updateSourceSchema,
     modelDownloadSource: modelDownloadSourceSchema,
     magicNotesEnabled: z.boolean(),
+    magicNotesShowIncompleteTodoCount: z.boolean(),
     magicNoteCommentMode: magicNoteCommentModeSchema,
     magicNoteCommentFormat: magicNoteCommentFormatSchema
   })

src/shared/contracts.ts

@@ -63,6 +63,7 @@ import type {
   MagicNotesSnapshot,
   MagicNoteUpdateInput,
   MagicTodoItem,
+  MagicTodoStatus,
   MagicTodoUpdateInput,
   MagicTodoUpdateResult,
   MagicTodosSnapshot
@@ -1703,6 +1704,7 @@ export type DesktopApi = {
       options: MagicNoteAnalysisOptions
     ) => Promise<MagicNoteDraftAnalysis>
     listTodos: () => Promise<MagicTodosSnapshot>
+    getTodoStatus: () => Promise<MagicTodoStatus>
     updateTodo: (
       input: MagicTodoUpdateInput
     ) => Promise<MagicTodoUpdateResult>
@@ -1713,6 +1715,7 @@ export type DesktopApi = {
     onAnalysisEvent: (
       listener: (event: MagicNoteAnalysisStreamEvent) => void
     ) => () => void
+    onTodoStatusChanged: (listener: () => void) => () => void
   }
   knowledge: {
     getSnapshot: (libraryId?: string) => Promise<KnowledgeSnapshot>

src/shared/goodbuddy-config-contracts.test.ts

@@ -136,6 +136,7 @@ describe('GoodBuddy configuration contracts', () => {
         updateSource: 'github',
         modelDownloadSource: 'modelscope',
         magicNotesEnabled: true,
+        magicNotesShowIncompleteTodoCount: true,
         magicNoteCommentMode: 'immediate',
         magicNoteCommentFormat: 'combined'
       },

src/shared/ipc-channels.ts

@@ -178,6 +178,8 @@ export const ipcChannels = {
   magicNotesAnalyzeDraft: 'magic-notes:analyze-draft',
   magicNotesAnalysisEvent: 'magic-notes:analysis-event',
   magicTodosList: 'magic-todos:list',
+  magicTodosStatus: 'magic-todos:status',
+  magicTodosStatusChanged: 'magic-todos:status-changed',
   magicTodosUpdate: 'magic-todos:update',
   magicTodosAnalyze: 'magic-todos:analyze',
   knowledgeSnapshot: 'knowledge:snapshot',

src/shared/magic-notes-contracts.ts

@@ -438,6 +438,10 @@ export type MagicTodoUpdateResult = {
   note: MagicNoteDetail
 }
 
+export type MagicTodoStatus = {
+  incompleteCount: number
+}
+
 export type MagicTodosSnapshot = {
   todos: MagicTodoItem[]
 }