## MODIFIED Requirements

### Requirement: Hardcoded response

The assistant SHALL reply with a real AI response streamed from the backend API, replacing the previous hardcoded stub. Tokens appear incrementally as they arrive.

#### Scenario: Bot replies with streamed AI response

- **WHEN** the user sends any message
- **THEN** the assistant message appears and grows token by token as the stream delivers text

### Requirement: Message input

The chat page SHALL provide a text input area at the bottom of the page where the user can type and submit messages.

#### Scenario: Submit via button

- **WHEN** the user types text and clicks the send button
- **THEN** the message is added to the conversation and the input is cleared

#### Scenario: Submit via Enter key

- **WHEN** the user types text and presses Enter
- **THEN** the message is submitted (same as clicking send)

#### Scenario: Empty input blocked

- **WHEN** the user attempts to send an empty or whitespace-only message
- **THEN** nothing is sent and no message is added

#### Scenario: Input disabled during streaming

- **WHEN** the assistant is currently streaming a response
- **THEN** the input field and send button are disabled until streaming completes

## ADDED Requirements

### Requirement: Thinking indicator

The chat page SHALL show a visual indicator while waiting for the first token from the assistant.

#### Scenario: Indicator shown during wait

- **WHEN** the user sends a message and the assistant has not yet started streaming
- **THEN** a thinking indicator (e.g., animated dots) is shown in the assistant message area

#### Scenario: Indicator replaced by content

- **WHEN** the first token arrives from the stream
- **THEN** the thinking indicator is replaced by the streamed text