When a user lands on Review without an upload, show a file uploader
on the page itself and auto-run the analyzer once a file is picked,
rather than bouncing them to the home page with a "Back to home"
button.
Auto-analyze is the right default here: the user is already on the
Review page, so they've implicitly committed to a scan. Stashing the
bytes in the same session-state keys the home page uses keeps the
rest of the flow (encoding picker, gate, tool pages) unchanged.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>