forked from Tadrisino/MathApp_frontend
A signed-in user with a snapshot goes straight to home; the same boot requests run in the background and replace it. Snapshot is cleared whenever tokens are cleared and on a new login, ignored from another build or when older than 7 days, and dropped when the fresh profile is a different user (reboot remounts MainApp via a generation key; AnimatePresence otherwise kept the exiting one). Notifications/characters wait for the profile answer so an expired access token costs the same requests as before. refreshHome applies only the latest answer. Home shows a "saved data" strip when the map could not be refreshed. Measured locally (old vs new build, same backend, Chrome throttling, median of 3, time to map): Fast 3G 2.46s -> 1.80s (expired token 3.63s -> 1.80s); Slow 3G 8.52s -> 6.14s (expired 12.6s -> 6.13s); API requests per open unchanged (6 valid, 11 expired). 12/12 behaviour checks passed. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>