Path autocomplete in new session dialog

[doyled-it]

Feature Request

Add autocomplete/auto-suggestion for the path field when creating a new session in the new session dialog.

Problem

Currently, users must manually type out or copy-paste the full path when creating a new session. This is tedious, especially for frequently used project directories.

Proposed Solution

Add filesystem path autocomplete to the path input field in the new session dialog (src/tui/component/dialog-new.tsx). As the user types, suggest matching directories from the filesystem.

Additional Context

The project already has autocomplete infrastructure (fuzzy search for previously used paths and branch names via src/core/history.ts). This could be extended to also suggest filesystem paths as the user types.

Priority

Nice-to-have / quality of life improvement.

[samratdotm]

Hi! I would like to work on this issue.

I reviewed the current implementation and noticed that the new-session flow now lives in src/tui/component/dialog-new-wizard.tsx. The path input already uses InputAutocomplete, but its suggestions currently come only from project path history.

My proposed approach is to:

• Add a small filesystem path-suggestion helper
• Suggest matching directories from the current parent directory
• Preserve ~-prefixed paths in displayed suggestions
• Merge filesystem suggestions with existing path history
• Handle nonexistent or inaccessible paths without errors
• Add unit tests for prefix matching, directories-only filtering, ~ expansion, and invalid paths

I’ll keep the change focused and avoid modifying the shared autocomplete component unless necessary. Please let me know if this approach aligns with the project direction.