User messages as markdown with toggle

Improvements

• TerminalImplement smooth scrolling for autocomplete dropdown navigation@HelloGGX
• TerminalLSP: add oxlint server@Eric162
• TerminalUse correct Octokit API for PR review comment reactions@elithrar
• DesktopFixed error handling
• DesktopSeparate prompt history for shell
• DesktopDon't navigate prompt history if dirty
• DesktopRemove pinch-to-zoom on window@Brendonovich