Chain 0.42.1 Preview

• Clarify the focus screen with a compact project selector, a labeled session intention, and the selected project's active goal under "Working toward" on Windows and Android.
• Keep Return to focus in the main session bar; remove duplicate shortcuts from detail sheets and hide goal preparation buttons during a live session.
• Use the same running-session bar on Windows Today as on other browsing screens.
• Fix Windows Today's furnace to include current-session focus while excluding breaks.
• Clarify furnace warm-up progress and mark live contributions as unbanked.

Please retest project switching and intention editing during focus, browsing and returning to a live session, and furnace progress through a breather and banking.