Fix sidebar project removal

Remove projects through a daemon RPC so the sidebar can delete the project
record after archiving its active workspaces. Reopening a removed directory
recreates the missing project record so local projects keep their derived
basename, and History skips orphaned archived workspace rows.

Fixes #1583.

packages/app/src/stores/session-store.ts

@@ -460,6 +460,7 @@ interface SessionStoreActions {
   removeWorkspace: (serverId: string, workspaceId: string) => void;
   setEmptyProjects: (serverId: string, emptyProjects: Iterable<EmptyProjectDescriptor>) => void;
   addEmptyProject: (serverId: string, emptyProject: EmptyProjectDescriptor) => void;
+  removeEmptyProject: (serverId: string, projectId: string) => void;
   setWorkspaceRestoreStatus: (
     serverId: string,
     workspaceId: string,
@@ -1265,6 +1266,24 @@ export const useSessionStore = create<SessionStore>()(
         });
       },
 
+      removeEmptyProject: (serverId, projectId) => {
+        set((prev) => {
+          const session = prev.sessions[serverId];
+          if (!session?.emptyProjects.has(projectId)) {
+            return prev;
+          }
+          const next = new Map(session.emptyProjects);
+          next.delete(projectId);
+          return {
+            ...prev,
+            sessions: {
+              ...prev.sessions,
+              [serverId]: { ...session, emptyProjects: next },
+            },
+          };
+        });
+      },
+
       setWorkspaceRestoreStatus: (serverId, workspaceId, status) => {
         set((prev) => {
           const session = prev.sessions[serverId];