Adds the broader panel design that consolidates today's two-panel
layout (Routes/Contacts + floating PlaceDetail) into one always-visible
left column with state-driven content. Defines five panel states
(IDLE, PREVIEW, ROUTING, PREVIEW+ROUTING, ROUTE_CALCULATED), shared
place-card component, search bar behavior including aspirational
search history, and implementation phases k-o.
Documents the redesign of Navi's directions interface to address current
UX issues (no visible from/to inputs, hidden mode-switching, ephemeral
toast prompts) and adds a general-purpose radial map context menu
(right-click desktop, long-press mobile) for spatial map interactions.
Implementation deferred to dedicated session.