pathways: walking mosaic navigator

Replace the scrolling facet-grid with a walkable maze. You start on a
random photo; every photo holds up to four paths (labels, keywords,
camera, lens ranked by count, library as fallback), one per cardinal
direction, each an ordered cycle. Arrow keys or hover-revealed buttons
lock the next photo of that path onto the grid in the direction moved;
visited photos form a panable mosaic with focus-jump on revisits.

Server: precomputes per-photo exits; adds /api/exits/:id and /api/random.
Client: zero-dependency rewrite — splash, hidden exits, drag-pan, pointer
capture, reduced-motion support.

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