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Will Binns-Smith
2f3f74b13f
Adds a compare mode to the bundle analyzer. When the user picks a
historical snapshot from the new baseline picker in the top bar, the UI
switches into compare mode: routes are diff'd by name and size, and the
per-route view shows a `DiffTreemap` that colors each source tile by its
change status (added/removed/grew/shrank/unchanged).
The compare sidebar shows the import chain for the selected tile on
either the baseline ("A") or current ("B") side. Route totals are
fetched in parallel so the route picker can sort by largest impact and
classify routes as `changed`/`identical` rather than just name-presence.
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Co-authored-by: vercel-fleet-prod[bot] <318278635+vercel-fleet-prod[bot]@users.noreply.github.com>
Co-authored-by: Will Binns-Smith <755844+wbinnssmith@users.noreply.github.com>