feat(cmd): add cost command for expense analysis

- Introduce `cost` command to display the cost of commit
  messages.
- Implement `runCost` function to retrieve and display
  expenses using `utils` and `ui` packages.
- Handle errors for missing or failed expense retrieval.

[Generated by Kommit]

Author: cowboy-bebug

cmd/cost.go

@@ -0,0 +1,54 @@
+package cmd
+
+import (
+	"errors"
+	"fmt"
+	"os"
+
+	"github.com/cowboy-bebug/kommit/internal/ui"
+	"github.com/cowboy-bebug/kommit/internal/utils"
+	"github.com/spf13/cobra"
+)
+
+var costCmd = &cobra.Command{
+	Use:   "cost",
+	Short: "Show the cost of your commitment therapy",
+	Long: `💰 Kommit Cost Analysis - Because emotional growth has a price tag!
+
+This command reveals how much your repository's therapy sessions have cost you so far.
+Think of it as reviewing your therapy bills - a necessary part of the healing process.
+
+Just as real therapy isn't free, AI-powered commit messages come with a cost.
+Still, it's cheaper than the emotional damage of trying to decipher "fixed stuff"
+six months from now when you're debugging at 3 AM.
+
+Your wallet might need its own support group, but your future self will thank you
+for the investment in clear, meaningful commit history.`,
+	Run: runCost,
+}
+
+func runCost(cmd *cobra.Command, args []string) {
+	costs, err := utils.GetCosts()
+	if err != nil {
+		if errors.Is(err, utils.CostFileNotFoundError{}) {
+			fmt.Println("😰 Financial abandonment detected: It hasn't committed any expenses yet.")
+			fmt.Println("(Have you run `git kommit` yet?)")
+			os.Exit(0)
+		}
+		fmt.Println("😰 Financial abandonment detected: Failed to retrieve your expenses.")
+		os.Exit(1)
+	}
+
+	if err = ui.CostTableModel(costs); err != nil {
+		ui.HandleQuitError(err)
+		if err != nil {
+			fmt.Println("😰 Financial abandonment detected: Failed to display your expenses.")
+			os.Exit(1)
+		}
+	}
+
+}
+
+func init() {
+	rootCmd.AddCommand(costCmd)
+}