Added

• Startup financial dashboard: three-tab view with Overview (period table), Burn Rate (runway cards + CSS bar chart), and P&L (category pivot table)
• Financial periods stored in finances/ directory as one .md file per month with revenue and expense line items in YAML frontmatter
• Derived metrics computed in browser: net, burn rate, runway months
• API routes: GET/POST /api/finances, GET/PUT/DELETE /api/finances/:id
• Sidenav: create/edit periods with dynamic add/remove revenue and expense line items, cash on hand, and notes
• Registered in feature visibility toggle under Finances group