Multi-file workflow: a user uploads several files on Home, clicks
"Open <Tool>" on one file's findings, lands on a tool page. The
sidebar lets them get back to Home, but a top-of-page back affordance
is more discoverable and keeps the hand in the same screen region as
the upload list they're working through.
- New ``back_to_home_link()`` helper in components/_legacy.py renders
a secondary button that calls ``st.switch_page("app.py")`` — under
``st.navigation`` that routes to the default (Home) page.
- Wired into every tool page (1-9) directly after
``hide_streamlit_chrome()`` and BEFORE the license gate so a Lite
user who lands on a locked tool can navigate away without paying.
- New i18n key ``nav.back_to_home`` ("← Back to Home" /
"← Volver al inicio") in en/es packs.
2008 tests pass.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Michael
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