Jake's feedback on Phase 1: make the timer pinnable / always-on-top,
combined with the existing Now-list pop-out. Two changes:
1. Mount <FocusTimer /> in src/routes/float/+layout@.svelte so the
running countdown stays visible in the always-on-top float window
alongside the WIP task list. No content change to the float page
itself — the timer is a global overlay.
2. Add a pop-out icon to the main-window focus timer that opens the
existing /float route via window.open. One click → timer + Now
list pinned on top without touching main window focus. Hidden
inside the float window itself (detected via URL) so you cannot
recursively pop out.
Result matches the Todo float-out UX the user already knows:
click ExternalLink, you get a small always-on-top window with
tasks + a live countdown ring in the top-right.