Feature request: tab-completion for local file paths in chat input

Problem

When typing file paths in the Claude Code chat input (e.g. to reference a local file), there is no tab-completion. Users have to type full paths manually, which is slow and error-prone.

Suggested improvement

Add tab-completion for local file paths when typing in the chat input. This would work similarly to how terminals autocomplete paths, allowing users to quickly reference files without needing to remember exact paths.

Example use case

Typing Read services/website-an and pressing Tab should complete to services/website-analysis/ and continue completing from there.

Filed on behalf of a user via Claude Code.