- Replace inline styles in BackgroundTasksIndicator with semantic class names for pill, popover, and session rows
- Add dedicated styles for attention state, hover behavior, and muted text/border theme tokens
- Style session content, icons, and dismiss controls in styles.css to centralize indicator presentation
Introduces ai_sessions table (schema v9), AiSessionStore, and background
session support for mission interviews, planning, and subtask breakdown.
Adds BackgroundTasksIndicator component, SSE-based progress streaming,
and dashboard API routes for session management.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
