fix: stop duplicating directory lines in the reverse-prompt file tree

[eeshsaxena]

treeToString in lib/file-tree-formatter.ts prints every directory twice.

Each node is emitted once by its parent's child loop:

result += `${childPrefix}${child.name}${child.isDirectory ? "/" : ""}
`;

and then again at the top of its own recursive call:

if (!isRoot) {
  result += `${prefix}${node.name}${node.isDirectory ? "/" : ""}
`;
}

The second copy uses the child-continuation prefix rather than the branch connector, so a nested directory also shows up as a stray │ util/ line right after the correct ├── util/ one.

For example, given:

src/index.ts
src/util/helpers.ts
README.md

the current output is:

src/
src/
├── util/
│   util/
│   └── helpers.ts
└── index.ts
README.md

app/api/reverse-prompt/route.ts builds the repo tree with formatAsFilteredTree, which runs through treeToString, so the doubled listing goes straight into the prompt sent to the model.

Removing the redundant if (!isRoot) self-print fixes it. Every node is already printed once by its parent's loop, so each entry now appears exactly once:

src/
├── util/
│   └── helpers.ts
└── index.ts
README.md

Files are unaffected since they never recurse, and the root level is unchanged.

[vercel]

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[eeshsaxena]

@filiksyos the only red check here is the Vercel preview deploy, which is waiting on a team member to authorize it (Vercel requires that for PRs from outside forks). The GitGuardian security check passes. Could you authorize the deploy when you get a chance? The change itself is a small 4-line fix that stops the reverse-prompt file tree from printing each directory twice. Thanks!