Stopped MCP SSE connections from getting stuck in reconnect loops after server error responses

Fixes

• CoreFixed provider model configs that use interleaved reasoning fields like reasoning_text or custom field names.
• DesktopOpen external links in the system browser instead of inside the app.
• DesktopFixed stale session tab state in the desktop title bar.@OpeOginni
• DesktopOpen the legacy directory picker at your home folder when no home path is loaded yet.
• DesktopPrevent the file tree tab from clipping when resized smaller.@OpeOginni
• DesktopFixed debug gutter labels and values misaligning.