refactor: remove legacy email types and schemas; introduce new flow console components and utilities

- Deleted outdated types related to email handling from `src/components/flow/types.ts`, `src/lib/email-schema.ts`, and `src/lib/email-templates.ts`.
- Added new components for the flow console, including `ContactHoverCard.tsx` for displaying contact information and actions.
- Introduced utility functions in `compose.ts`, `constants.ts`, `format.ts`, `http.ts`, `mail.ts`, `reader.ts`, `sse.ts`, and `types.ts` to support the new flow console features.
- Implemented message rendering and sanitization logic to ensure safe HTML output in the reader.
- Established a new structure for managing mail messages, threads, and reactions in the flow console.

Author: CheFu Inc

public/file.svg

@@ -3,8 +3,5 @@
 @import "tw-animate-css";
 @import "shadcn/tailwind.css";
 @import "./styles/base.css";
-@import "./styles/module-theme.css";
-@import "./styles/flow-workbench.css";
-@import "./styles/mail-console.css";
 
 @custom-variant dark (&:is(.dark *));