Fix plugin and mode glob patterns

Improvements

• CoreAdd debug agent subcommand to test agents in isolation@Eric-Guo
• CoreDisplay MCP tag for prompts in autocomplete but not in prompt@paoloricciuti
• TerminalClarify agent-name placeholder in tips@anzulaqeel-anunzio
• DesktopRemove status bar and add new elements in header
• DesktopBetter new session button in desktop app
• DesktopAdd unified diff toggle to desktop application
• DesktopFix desktop not rendering large sessions