Add Athlete Daily Check-in UI with readiness sliders, yes/no toggles, and audit submission

[Copilot]

This PR adds the athlete-facing morning check-in interface requested in the issue: a mobile-friendly form for subjective readiness metrics plus binary wellness/compliance inputs, submitted to /api/v1/audit with user feedback.

• Daily check-in form component

  • Added AthleteCheckInForm with 1–10 sliders for:
    • Sleep Quality
    • Stress Level
    • Physical Fatigue
  • Added Yes/No toggle groups for:
    • Nutrition plan adherence
    • Jetlag symptoms

• Dashboard integration

  • Embedded the new form as a dedicated card in Dashboard’s right column, aligned with existing panel/card layout.

• Submission + feedback flow

  • Form submit triggers POST /api/v1/audit with normalized payload keys.
  • Added transient success/error toast notifications.
  • Toast includes accessibility semantics (role="alert", aria-live="polite").

await axios.post(`${API_BASE_URL}/api/v1/audit`, {
  sleep_quality: formData.sleepQuality,
  stress_level: formData.stressLevel,
  physical_fatigue: formData.physicalFatigue,
  followed_nutrition_plan: formData.followedNutritionPlan,
  has_jetlag_symptoms: formData.hasJetlagSymptoms
});