Logo SVGs referenced by string path (/logo.svg) were cached by CDNs and
browsers after deployments. Import them with Vite's ?url suffix so the
build emits content-hashed filenames that force a refresh on change.
LeagueRow and StandingsPreview had duplicated StatColumn, StatDivider,
and rank-change indicator helpers. Extract them into a shared
StatHelpers module so both pages render rank and points identically
(#3 style with consistent rank-change arrows).
