v0.9.3

Changed:
Added unified built-in and advanced local privacy filtering with a single translated review popup.
Added local privacy model installation and advanced privacy controls.
Added conversation file browsing.
Applied repository-wide Ruff cleanup.

Fixed:
Suppressed duplicate built-in findings when advanced privacy already blocks the same text.
Preserved intentional compatibility re-exports after lint cleanup.
Ignored the local pnpm store.