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// Task: "Add dark mode toggle to settings"
// Agent reads: src/components/Settings.tsx, src/styles/globals.css
// Agent writes:

// src/context/ThemeContext.tsx — new file
// src/components/ThemeToggle.tsx — new component
// src/components/Settings.tsx — adds toggle to appearance section
// src/styles/globals.css — adds :root / .dark CSS variables
// src/tests/ThemeToggle.test.tsx — unit tests

// Quality gates: ✓ tsc ✓ jest (4/4) ✓ eslint ✓ build
// → In Review → Approved → Done

// Ticket: "Checkout fails with discount code SUMMER2025MEGA"
// Agent reads:
//   - Customer history: 3 prior tickets, enterprise plan
//   - Obsidian: Support/Checkout-Issues.md
//   - Memory: "codes >20 chars → known v2.3.0 bug"

// Draft response:
// "Hi Sarah, thanks for reaching out. This looks related
//  to a known issue with longer discount codes in versions
//  before 2.3.1. Could you confirm your current version?
//  In the meantime, here's a workaround: [steps]..."

// → Approved → Sent → Resolved in 4 minutes
// Memory: resolution pattern reinforced

// Sentry: TypeError at checkout/payment.ts:142
// 340 users affected, started 2 hours ago

// Investigation:
//   git log --oneline checkout/payment.ts → PR #847 (2h ago)
//   Diff: removed optional chaining on response.data?.id

// Fix: checkout/payment.ts
- const orderId = response.data.id;
+ const orderId = response.data?.id;
+ if (!orderId) {
+   logger.error("Payment response missing order ID", { response });
+   throw new CheckoutError("PAYMENT_PROCESSING", "Please try again");
+ }

// Tests added:
//   ✓ handles null payment response
//   ✓ handles partial response (missing id)
//   ✓ processes valid response correctly

// Gates: ✓ tsc ✓ jest (47/47) ✓ eslint ✓ build
// PR #851 → Approved → Deployed → Sentry resolved