Add component tests for P3.11 (82 tests across 5 files)

- DecisionCard tests: 11 tests covering rendering, status icons, styling
- DataPanel tests: 18 tests covering biometrics display, null handling, styling
- NutritionPanel tests: 12 tests covering seeds, carbs, keto guidance display
- OverrideToggles tests: 18 tests covering toggle states, callbacks, styling
- DayCell tests: 23 tests covering phase coloring, today highlighting, click handling

Total tests now: 707 passing across 40 test files

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/components/dashboard/data-panel.test.tsx

@@ -0,0 +1,143 @@
+// ABOUTME: Unit tests for DataPanel component.
+// ABOUTME: Tests biometrics display including body battery, HRV, and intensity.
+import { render, screen } from "@testing-library/react";
+import { describe, expect, it } from "vitest";
+import { DataPanel } from "./data-panel";
+
+describe("DataPanel", () => {
+  const baseProps = {
+    bodyBatteryCurrent: 75,
+    bodyBatteryYesterdayLow: 25,
+    hrvStatus: "Balanced",
+    weekIntensity: 120,
+    phaseLimit: 200,
+    remainingMinutes: 80,
+  };
+
+  describe("rendering", () => {
+    it("renders the YOUR DATA heading", () => {
+      render(<DataPanel {...baseProps} />);
+
+      expect(screen.getByText("YOUR DATA")).toBeInTheDocument();
+    });
+
+    it("renders body battery current value", () => {
+      render(<DataPanel {...baseProps} />);
+
+      expect(screen.getByText(/Body Battery: 75/)).toBeInTheDocument();
+    });
+
+    it("renders yesterday low value", () => {
+      render(<DataPanel {...baseProps} />);
+
+      expect(screen.getByText(/Yesterday Low: 25/)).toBeInTheDocument();
+    });
+
+    it("renders HRV status", () => {
+      render(<DataPanel {...baseProps} hrvStatus="Balanced" />);
+
+      expect(screen.getByText(/HRV: Balanced/)).toBeInTheDocument();
+    });
+
+    it("renders week intensity with phase limit", () => {
+      render(<DataPanel {...baseProps} />);
+
+      expect(screen.getByText(/Week: 120\/200 min/)).toBeInTheDocument();
+    });
+
+    it("renders remaining minutes", () => {
+      render(<DataPanel {...baseProps} />);
+
+      expect(screen.getByText(/Remaining: 80 min/)).toBeInTheDocument();
+    });
+  });
+
+  describe("null value handling", () => {
+    it("displays N/A when bodyBatteryCurrent is null", () => {
+      render(<DataPanel {...baseProps} bodyBatteryCurrent={null} />);
+
+      expect(screen.getByText(/Body Battery: N\/A/)).toBeInTheDocument();
+    });
+
+    it("displays N/A when bodyBatteryYesterdayLow is null", () => {
+      render(<DataPanel {...baseProps} bodyBatteryYesterdayLow={null} />);
+
+      expect(screen.getByText(/Yesterday Low: N\/A/)).toBeInTheDocument();
+    });
+
+    it("displays N/A for both when both are null", () => {
+      render(
+        <DataPanel
+          {...baseProps}
+          bodyBatteryCurrent={null}
+          bodyBatteryYesterdayLow={null}
+        />,
+      );
+
+      expect(screen.getByText(/Body Battery: N\/A/)).toBeInTheDocument();
+      expect(screen.getByText(/Yesterday Low: N\/A/)).toBeInTheDocument();
+    });
+  });
+
+  describe("HRV status variations", () => {
+    it("displays Balanced HRV status", () => {
+      render(<DataPanel {...baseProps} hrvStatus="Balanced" />);
+
+      expect(screen.getByText(/HRV: Balanced/)).toBeInTheDocument();
+    });
+
+    it("displays Unbalanced HRV status", () => {
+      render(<DataPanel {...baseProps} hrvStatus="Unbalanced" />);
+
+      expect(screen.getByText(/HRV: Unbalanced/)).toBeInTheDocument();
+    });
+
+    it("displays Unknown HRV status", () => {
+      render(<DataPanel {...baseProps} hrvStatus="Unknown" />);
+
+      expect(screen.getByText(/HRV: Unknown/)).toBeInTheDocument();
+    });
+  });
+
+  describe("intensity values", () => {
+    it("displays zero intensity correctly", () => {
+      render(<DataPanel {...baseProps} weekIntensity={0} />);
+
+      expect(screen.getByText(/Week: 0\/200 min/)).toBeInTheDocument();
+    });
+
+    it("displays when over phase limit", () => {
+      render(<DataPanel {...baseProps} weekIntensity={250} phaseLimit={200} />);
+
+      expect(screen.getByText(/Week: 250\/200 min/)).toBeInTheDocument();
+    });
+
+    it("displays zero remaining minutes", () => {
+      render(<DataPanel {...baseProps} remainingMinutes={0} />);
+
+      expect(screen.getByText(/Remaining: 0 min/)).toBeInTheDocument();
+    });
+
+    it("displays negative remaining minutes", () => {
+      render(<DataPanel {...baseProps} remainingMinutes={-50} />);
+
+      expect(screen.getByText(/Remaining: -50 min/)).toBeInTheDocument();
+    });
+  });
+
+  describe("styling", () => {
+    it("renders within a bordered container", () => {
+      const { container } = render(<DataPanel {...baseProps} />);
+
+      const panel = container.firstChild as HTMLElement;
+      expect(panel).toHaveClass("rounded-lg", "border", "p-4");
+    });
+
+    it("renders heading with semibold font", () => {
+      render(<DataPanel {...baseProps} />);
+
+      const heading = screen.getByText("YOUR DATA");
+      expect(heading).toHaveClass("font-semibold");
+    });
+  });
+});