## MODIFIED Requirements

### 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. The input area SHALL also include a file upload button for triggering email extraction.

#### 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, send button, and upload button are disabled until streaming completes

#### Scenario: Upload button opens file picker

- **WHEN** the user clicks the upload button in the input area
- **THEN** a file picker dialog opens filtered to .html files