Gemini in the AI sidebar, wider body widths

AI Chat Improvements

• Gemini joins Claude Code and Codex as a first-class AI sidebar provider.
• Model picker in the experimental AI chat composer — choose between models like Sonnet vs. Opus per conversation.
• The AI sidebar now picks up your current text selection and any @-mentioned notes as context for more relevant responses.
• More subdued dark-mode background in the AI sidebar.
• Starting an AI chat when the required CLI isn't installed shows a helpful prompt instead of a cryptic error.
• Reassigned shortcuts for the AI sidebar and inline code to resolve conflicts.

Enable the AI chat in Settings > Experimental.

New

• Two new body width presets — XL and XXL — for writers who prefer a wider column. Pick from S / M / L / XL / XXL in settings.

Fixed

• Outline navigation now works in preview mode — clicking a heading scrolls to it in both source and preview.