Add rowboat auth flow using Supabase as the OIDC provider. User info is
fetched via the standard OIDC userinfo endpoint (discovered from issuer
metadata) instead of a hard-coded Supabase URL. Includes login screen,
auth state hook, IPC handlers, logout button, and id_token_sub persistence
for userinfo fetches across app restarts.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Implement a stop execution feature that allows users to abort ongoing LLM
streaming, kill running tool calls, and clear pending permission/human input
requests. Uses a hybrid approach: first click sends graceful SIGTERM, second
click within 2s sends SIGKILL and force-closes MCP clients.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
