fix(tui): show directory and git branch in session footer

[kunal70006]

Fixes #7927 (partially)

Problem

The Footer component (shows directory + git branch) is imported but never rendered in the session view. Home screen shows it, but during an active session this info disappears.

Solution

Add <Footer /> after <Toast /> in the session layout (1 line change).

Visual Change (TUI)

Before - bottom of session screen:

After - bottom of session screen:

Tested locally with bun dev.