UI: Add “Generate Architecture” Button to Dashboard

[lele-maxwell]

Description

Add a button labeled "Generate Architecture" to the project dashboard or individual project view. This button should initiate the architecture generation flow.

Requirements

• Button visible only when a project is uploaded.
• Tooltip on hover: “Click to generate system architecture overview”.
• Button disabled or loading state while the analysis is in progress.
• Position the button logically (e.g., near the Analyze button or project card).

Acceptance Criteria

• Button is rendered correctly across screen sizes.
• Clicking it triggers the backend endpoint.