feat(M4): FR-R2/R6/R7 搜索+标签筛选——search hay 加 tags+links 元数据(R2); TagFilter 加折叠按钮(R6); tagPaths IPC+FileTree AND 过滤选中标签的文档(R7); store 加 tagFilter; search-tag E2E 2 项

packages/shared/src/types/ipc.ts

@@ -24,6 +24,7 @@ export const IPC = {
   docReveal: 'doc:reveal',
   search: 'search',
   tagStats: 'tag:stats',
+  tagPaths: 'tag:paths',
   graph: 'graph',
   winMinimize: 'win:minimize',
   winMaximize: 'win:maximize',
@@ -59,6 +60,7 @@ export interface IpcMap {
   [IPC.docReveal]: { args: { path: string }; result: void };
   [IPC.search]: { args: { query: string }; result: SearchHit[] };
   [IPC.tagStats]: { args: void; result: TagStat[] };
+  [IPC.tagPaths]: { args: void; result: Record<string, string[]> };
   [IPC.graph]: { args: void; result: GraphData };
   [IPC.winMinimize]: { args: void; result: void };
   [IPC.winMaximize]: { args: void; result: void };