fix(worktree): only dedupe a linked worktree against a git main checkout

Review follow-up: the repos:add guard matched any tracked repo on the main
checkout path, including a folder-kind record. A folder repo does not
project onto the same project as the git worktree, so matching it would
suppress a legitimate add without deduping anything.

src/main/ipc/repos-add-linked-worktree.test.ts

@@ -167,6 +167,18 @@ describe('repos:add with git worktrees', () => {
     expect(mockStore.addRepo).not.toHaveBeenCalled()
   })
 
+  it('does not match a folder record sitting on the main-checkout path', async () => {
+    mockStore.getRepos.mockReturnValue([
+      { ...trackedMainRepo(), id: 'folder-repo-id', kind: 'folder' } as Repo
+    ])
+    getLinkedWorktreeMainRepoRootMock.mockReturnValue(MAIN_CHECKOUT)
+
+    const result = await callAdd({ path: LINKED_WORKTREE })
+
+    expect(mockStore.addRepo).toHaveBeenCalledTimes(1)
+    expect(result).toEqual({ repo: expect.objectContaining({ path: LINKED_WORKTREE }) })
+  })
+
   it('does not match a tracked SSH repo that shares the local main-checkout path', async () => {
     mockStore.getRepos.mockReturnValue([
       { ...trackedMainRepo(), id: 'ssh-repo-id', connectionId: 'builder' } as Repo

src/main/ipc/repos.ts

@@ -203,11 +203,15 @@ async function addLocalRepoFromPath(
     const mainRepoRoot = getLinkedWorktreeMainRepoRoot(resolvedPath)
     if (mainRepoRoot) {
       const mainRepoKey = normalizeRuntimePathForComparison(mainRepoRoot)
+      // Why !isFolderRepo: only a git-kind main checkout projects onto the same project as its
+      // worktree, so matching a folder record would suppress the add without deduping anything.
       const trackedMainRepo = store
         .getRepos()
         .find(
           (repo) =>
-            !repo.connectionId && normalizeRuntimePathForComparison(repo.path) === mainRepoKey
+            !repo.connectionId &&
+            !isFolderRepo(repo) &&
+            normalizeRuntimePathForComparison(repo.path) === mainRepoKey
         )
       if (trackedMainRepo) {
         return { repo: trackedMainRepo, alreadyExisted: true }