Implement CLI file sending capability #87
Description
Summary
Add basic command-line interface support for sending files to Webex rooms/users as a foundation for TUI implementation.
Requirements
- Send files via CLI command to specific rooms
- Handle file upload with basic error reporting
- Support common file types and reasonable size limits
- Provide upload progress feedback
Dependencies
- Requires completion of Webex API research issue
- May need webex-rust crate extensions
Acceptance Criteria
- Files can be sent via CLI command
- Upload errors are properly reported
- Basic file validation (existence, size)
- Success confirmation when file is sent
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