v1.18.8

## Core

### Improvements

- Improved compatibility with newer MCP servers and OAuth flows.

### Bugfixes

- Reconnects MCP servers after expired SDK sessions, including concurrent requests.
- Honors configured MCP OAuth callback ports in `mcp debug`.
- Stops sending deprecated sampling defaults to newer Gemini models.

## Desktop

### Improvements

- Added a shortcut to open the project selector in new sessions.

### Bugfixes

- Tab keyboard navigation now follows the visible tab order.
- Opening files now expands Windows folders with trailing separators.
- Server status uses blue when an integration needs attention.
- Provider connection state now refreshes immediately after changes.
- Linux packages now install AppStream metadata. (@develop7)
- Local desktop runs now use the channel database.
- Prevents freezes when closing projects from the home view.
- Prevents the right panel from freezing the session view while loading.

**Thank you to 2 community contributors:**
- @OpeOginni:
  - fix(core): correct MCP environment field in built-in skill (#39175)
- @develop7:
  - fix(desktop): install AppStream metainfo in Linux packages (#36872)