fix(sidebar): preserve filtered folder workspace rows

src/renderer/src/components/sidebar/WorktreeList.tsx

@@ -6943,6 +6943,7 @@ const WorktreeList = React.memo(function WorktreeList({
       workspaceHostScope: 'all'
     }) &&
     worktrees.length === 0 &&
+    visibleFolderWorkspacesForRows.length === 0 &&
     placeholderRepoIds.size === 0 &&
     importedWorktreesByRepo.size === 0
   // Why: host filters own Project Group rows; only workspace filters may replace those rows with Clear Filters.

src/renderer/src/components/sidebar/project-group-header-dom.test.ts

@@ -783,6 +783,20 @@ describe('WorktreeList project-group host filtering', () => {
     expect(container.textContent).not.toContain('No workspaces found')
   })
 
+  it('keeps a selected-host folder-only owner group visible under workspace filters', async () => {
+    setHostFilteredWorktreeListState([hostFilteredFolderWorkspace()])
+    worktreeListStore.state = {
+      ...worktreeListStore.state,
+      hideDefaultBranchWorkspace: true
+    }
+
+    const container = await renderHostFilteredWorktreeList()
+
+    expect(container.textContent).toContain('Runtime project group')
+    expect(container.textContent).toContain('Runtime folder workspace')
+    expect(container.textContent).not.toContain('No workspaces found')
+  })
+
   it('still lets a workspace filter replace empty project-group headers', async () => {
     setHostFilteredWorktreeListState([])
     worktreeListStore.state = {