feat: Add Lawn Care Tips section and improve Dashboard layout

This commit introduces a new "Lawn Care Tips" section to the application and refines the visual layout of the main Dashboard.

**Key Changes:**

*   **Lawn Care Tips Feature:**
    *   Added `LawnCareTip` model with `Title`, `Category`, and `Content` properties.
    *   Defined `TipCategory` enum for better organization (Mowing, Watering, Fertilizing, Weed Control, Aeration, General).
    *   Integrated `LawnCareTip` into `ApplicationDbContext` for database persistence.
    *   Updated `_Layout.cshtml` to include a new "Lawn Tips" navigation link.

*   **Dashboard Layout Fix:**
    *   Refactored `Views/Home/Index.cshtml` to correctly use Bootstrap's grid system by placing the "Log a New Activity" card in its own `div.row`. This resolves the layout issue where the card was appearing immediately after the previous row without proper spacing.
    *   Updated `HomeController` to include a `LastAerationDate` query for the dashboard display.
    *   Modified `DashboardViewModel` to include `LastAerationDate`.

*   **Build/Dependency Updates:**
    *   Added `Microsoft.EntityFrameworkCore.SqlServer` (likely a residue from scaffolding, though SQLite is still primary).
    *   Added `Microsoft.VisualStudio.Web.CodeGeneration.Design` for scaffolding tools.

This enhances the application's functionality by providing a knowledge base and improves the user experience with a cleaner dashboard layout.

Models/LawnCareTip.cs

@@ -0,0 +1,30 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace turf_tasker.Models;
+
+public enum TipCategory
+{
+    Mowing,
+    Watering,
+    Fertilizing,
+    [Display(Name = "Weed Control")]
+    WeedControl,
+    Aeration,
+    General
+}
+
+public class LawnCareTip
+{
+    public int Id { get; set; }
+    
+    [Required]
+    [StringLength(100)]
+    public string Title { get; set; } = string.Empty;
+    
+    [Required]
+    public TipCategory Category { get; set; }
+    
+    [Required]
+    [DataType(DataType.MultilineText)]
+    public string Content { get; set; } = string.Empty;
+}