Task language polish · steadier long-running replies

Tasks & Language
- Process summaries and visible progress text now follow your interface language more consistently while preserving commands, paths, URLs, and quoted source text exactly.
- Tool timeline summaries stay aligned with the language you are using in the app, so mixed-language tasks feel less jarring.
Long-Running Tasks
- Fixed a cutoff that could interrupt continuation work after quiet stretches, helping longer tasks keep streaming results instead of stopping early.
- Replies that resume after a handoff now render in the right place, and late-created files attach to the correct message.
Workspace & Performance
- The right preview panel now keeps its saved width more reliably while opening and closing.
- Reduced extra project refreshes during active tasks, making streaming turns lighter.