[Schedules 6/8] Schedules list page

[sre-helmcode]

Implementation Order: 6 of 8

Depends on: #21 (types + sidebar)
Feature: Schedules — Recurring automated tasks for AI agent teams

Summary

Build the main Schedules list page showing all configured schedules as cards with status, frequency, and controls.

Page: src/pages/SchedulesListPage.tsx

Layout

┌─────────────────────────────────────────────────────────┐
│ Schedules                                  [+ Schedule] │
│                                                         │
│ ┌─────────────────────────────────────────────────────┐ │
│ │ 🟢 Weekly Tourism Post                    [toggle] │ │
│ │ Marketing Team · Every Monday at 9:00 AM (CET)     │ │
│ │ Last run: 2 days ago ✅ · Next: Mon Feb 28, 9:00 AM│ │
│ └─────────────────────────────────────────────────────┘ │
│                                                         │
│ ┌─────────────────────────────────────────────────────┐ │
│ │ ⚪ Daily Security Report                   [toggle] │ │
│ │ SecOps Team · Every day at 6:00 PM (UTC)           │ │
│ │ Last run: never · Next: Today, 6:00 PM             │ │
│ └─────────────────────────────────────────────────────┘ │
│                                                         │
│ ┌─────────────────────────────────────────────────────┐ │
│ │ 🔴 Monthly Report Generator                [toggle] │ │
│ │ Analytics Team · 1st of every month at 8:00 AM     │ │
│ │ Last run: 3 days ago ❌ · Next: Mar 1, 8:00 AM    │ │
│ └─────────────────────────────────────────────────────┘ │
└─────────────────────────────────────────────────────────┘

Card Content

• Status indicator: Green dot (idle+enabled), gray dot (disabled), red dot (error), blue pulsing dot (running)
• Name: Schedule name, clickable → navigates to detail page
• Team: Team name (from API enriched data)
• Frequency: Human-readable cron description (e.g., "Every Monday at 9:00 AM")
• Timezone: Displayed in parentheses
• Last run: Relative time + status emoji (✅ success, ❌ failed, ⏱️ timeout)
• Next run: Formatted date/time
• Toggle: Enable/disable switch (calls PATCH /toggle)

Cron to Human-Readable

Implement a utility function cronToHuman(expression: string): string that converts common patterns:

• 0 9 * * 1 → "Every Monday at 9:00 AM"
• 0 18 * * * → "Every day at 6:00 PM"
• 0 8 1 * * → "1st of every month at 8:00 AM"
• 0 */2 * * * → "Every 2 hours"
• 30 9 * * 1-5 → "Weekdays at 9:30 AM"

Empty State

"No schedules configured. Create your first schedule to automate recurring tasks."

Actions

• Click card → navigate to /schedules/:id (detail page)
• Toggle switch → enable/disable inline
• "Schedule" button → navigate to /schedules/new

Acceptance Criteria

• SchedulesListPage component with schedule cards
• Status indicators (green/gray/red/blue)
• Human-readable cron display
• Toggle enable/disable inline
• Navigate to detail and create pages
• Loading skeleton state
• Empty state
• Error handling with toast
• Follows existing dark theme conventions
• Unit tests