Test: Sessions list F2 rename behavior

[sandy081]

Refs: #333671, #336464, #336553, #336931

• anyOS Christof Marti (@chrmarti)

Complexity: 2

Authors: Sandeep Somavarapu (@sandy081)

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Verify the F2 and inline rename improvements in the Agents Window Sessions list.

1. Focus a session row and press F2. Verify inline rename starts for that session, accepts a valid title, and restores focus afterward.
2. Focus a nested chat row and press F2. Verify inline rename targets that chat rather than its parent session.
3. Open the session-header and nested-chat context menus. Verify Rename displays the F2 keybinding and invokes the correct target.
4. Try a blank title and verify visible validation prevents the rename.
5. Cancel a rename and verify the previous title is preserved.
6. Repeat the relevant flows using keyboard-only navigation.