[FEATURE] Show user message immediately after sending (before API response)

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

When I send a prompt, there is a delay of several seconds before any visual feedback appears (the "Thinking..." spinner). During this time, there is no indication that my message was sent successfully. This causes uncertainty about whether the input was received.

Proposed Solution

The user's message should appear immediately in the conversation history area as soon as the send action is triggered, similar to how chat applications like Slack or Discord work.

Current Flow:

1. User sends prompt
2. Wait several seconds (no visual change)
3. Spinner appears
4. Response arrives

Proposed Flow:

1. User sends prompt
2. User's message immediately appears in conversation history
3. Spinner appears below user's message
4. Response arrives

This provides instant confirmation that the message was sent and is a standard UX pattern in messaging applications.

Alternative Solutions

_No response_

Priority

Critical - Blocking my work

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_