Five fixes to the Sprint 15 Move to Project picker:
1. CRITICAL: Picker was invisible (overflow:hidden clipping)
Appended to document.body + positioned with fixed/getBoundingClientRect
instead of inside .session-item (overflow:hidden). Flips above button
when near bottom of viewport.
2. CRITICAL: Picker stretched full screen width
position:fixed removed the containing block width constraint. Added
max-width:220px; width:max-content to .project-picker.
3. UX: No way to create a project from the picker
Added '+ New project': creates project and moves session in one click.
4. UX: Feature was undiscoverable
Folder button shows persistently (blue, 60% opacity) when session
has a project.
5. Minor: Event listener leak
removeEventListener was missing from picker item onclick handlers.
Tests: 237 passed (7 pre-existing failures from unrelated logger bug).
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