Clarify levelSlider initialization design - single source of truth

[Copilot]

Addressed review feedback on PR #946 regarding levelSlider initialization strategy. The concern was about removing vehicle.maximumLevel as a fallback, potentially defaulting to 0% instead of a sensible charging level.

Design Clarification

The current implementation follows a single-source-of-truth pattern:

• New schedules: Created with level: this.vehicle.maximumLevel in vehicle-schedule.vue:87
• levelSlider init: Uses this.schedule.level || 0 as type safety only
• The || 0 fallback: Only triggers for future schedule types with null levels (e.g., "manual stop" events)

This eliminates the previous double-default pattern where both schedule creation AND levelSlider initialization would set maximumLevel. For any new schedule, levelSlider receives the correct value through the schedule object itself.

// vehicle-schedule.vue - single source of default
addTrip() {
  this.newSchedule = {
    level: this.vehicle.maximumLevel,  // Default set here
    // ...
  };
}

// schedule-item.vue - receives the default
data() {
  return {
    levelSlider: this.schedule.level || 0,  // Type safety only
  };
}

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