Show full file paths when manually adding context to avoid ambiguity between files with the same name

What feature would you like to see?

Problem

When manually adding context, files are listed by filename only (with a truncated path), and the full file path is not visible.

In deeply nested directories, it’s common to have multiple files with the same name (e.g. handler.go). Because the full path is hidden or truncated, it’s impossible to tell which file is which.

As a result, users cannot confidently determine which file they are adding, and may easily select the wrong one.

<img width="1332" height="483" alt="Image" src="https://github.com/user-attachments/assets/70c9c0f0-6870-4e92-83cb-5c3e7acbd247" />

Expected Behavior

When manually adding context, the UI should display the full file path (or at least enough of it) so that files with identical names can be clearly distinguished, even in deeply nested directory structures.

Additional information

_No response_