v0.9.0 - Compare parity, tidier sessions, translation fixes

The compare pinboard now shows the same depth as the full preview, the session list is easier to scan, and translation gets accuracy fixes.

• The compare pinboard reaches full preview parity: complete claims and description, with per-section copy and translate, plus a selected-count on Load patent data.
• The session sidebar groups by recency with day dividers and shows timestamps in your local time.
• Translation fixes: patent abstracts no longer come back in the wrong language, with an added safeguard for East-Asian (Chinese/Japanese/Korean) output.
• Copy buttons flash a confirmation when you copy.
• Reliability and interface polish throughout.