v0.9.4 — flip-back fix + a direct install while the store review is pending

The Chrome Web Store is still reviewing v0.9.4, so we opened a direct channel: download and load it in about a minute — https://mangasumi.com/chrome-extension/manual-install

What 0.9.4 fixes:

- Translations no longer disappear when you flip back to pages you already read — re-reading translated pages is instant and free.

- A page you already paid for is never silently charged again: lookup errors retry instead of re-billing, and your translated pages survive restarts and cache eviction.

- A cleaner popup that no longer resizes as it opens, and a redesigned on-page button.

- Faster: server-side changes cut median translate time from ~6.8s to ~4.2s.

When the store version catches up, install it and remove the manual copy (chrome://extensions → Remove) — your account and balance are unaffected either way.