fix: additional linting issues and code formatting

- Format all Go files with gofmt -s
- Fix remaining unused parameter warnings
- Convert single-case switch to if statement in app/root.go
- Convert if-else chain to switch statement in app/app.go
- Fix remaining unchecked error returns in tests

Author: exceptioncoding

app/app.go

@@ -1,81 +1,82 @@
-package app
-
-import (
-"os"
-"path/filepath"
-
-tea "github.com/charmbracelet/bubbletea"
-
-"aura/config"
-"aura/models"
-"aura/ui"
-)
-
-type App struct {
-program   *tea.Program
-config    *config.Config
-currentDir string
-state     models.AppState
-}
-
-func NewApp() (*App, error) {
-cfg, err := config.LoadConfig()
-if err != nil {
-return nil, err
-}
-
-currentDir, err := os.Getwd()
-if err != nil {
-return nil, err
-}
-
-currentDir, err = filepath.Abs(currentDir)
-if err != nil {
-return nil, err
-}
-
-app := &App{
-config:    cfg,
-currentDir: currentDir,
-state: models.AppState{
-CurrentDir: currentDir,
-Config:     cfg,
-TrustedDir: cfg.IsTrustedDir(currentDir),
-},
-}
-
-var initialModel tea.Model
-// Check if configuration is complete (has API key)
-if cfg.APIKey == "" || cfg.LLMProvider == "" {
-app.state.Screen = models.Configuration
-initialModel = ui.NewConfigModel(currentDir)
-} else if app.state.TrustedDir {
-app.state.Screen = models.Welcome
-initialModel = ui.NewWelcomeModel(currentDir)
-} else {
-app.state.Screen = models.SecurityPrompt
-initialModel = ui.NewSecurityPromptModel(currentDir)
-}
-
-rootModel := NewRootModel(initialModel, app)
-app.program = tea.NewProgram(rootModel, tea.WithAltScreen())
-
-return app, nil
-}
-
-func (a *App) Run() error {
-_, err := a.program.Run()
-return err
-}
-
-func (a *App) GetConfig() *config.Config {
-return a.config
-}
-
-func (a *App) GetCurrentDir() string {
-return a.currentDir
-}
-
-func (a *App) AddTrustedDir(dir string) error {
-return a.config.AddTrustedDir(dir)
-}
+package app
+
+import (
+	"os"
+	"path/filepath"
+
+	tea "github.com/charmbracelet/bubbletea"
+
+	"aura/config"
+	"aura/models"
+	"aura/ui"
+)
+
+type App struct {
+	program    *tea.Program
+	config     *config.Config
+	currentDir string
+	state      models.AppState
+}
+
+func NewApp() (*App, error) {
+	cfg, err := config.LoadConfig()
+	if err != nil {
+		return nil, err
+	}
+
+	currentDir, err := os.Getwd()
+	if err != nil {
+		return nil, err
+	}
+
+	currentDir, err = filepath.Abs(currentDir)
+	if err != nil {
+		return nil, err
+	}
+
+	app := &App{
+		config:     cfg,
+		currentDir: currentDir,
+		state: models.AppState{
+			CurrentDir: currentDir,
+			Config:     cfg,
+			TrustedDir: cfg.IsTrustedDir(currentDir),
+		},
+	}
+
+	var initialModel tea.Model
+	// Check if configuration is complete (has API key)
+	switch {
+	case cfg.APIKey == "" || cfg.LLMProvider == "":
+		app.state.Screen = models.Configuration
+		initialModel = ui.NewConfigModel(currentDir)
+	case app.state.TrustedDir:
+		app.state.Screen = models.Welcome
+		initialModel = ui.NewWelcomeModel(currentDir)
+	default:
+		app.state.Screen = models.SecurityPrompt
+		initialModel = ui.NewSecurityPromptModel(currentDir)
+	}
+
+	rootModel := NewRootModel(initialModel, app)
+	app.program = tea.NewProgram(rootModel, tea.WithAltScreen())
+
+	return app, nil
+}
+
+func (a *App) Run() error {
+	_, err := a.program.Run()
+	return err
+}
+
+func (a *App) GetConfig() *config.Config {
+	return a.config
+}
+
+func (a *App) GetCurrentDir() string {
+	return a.currentDir
+}
+
+func (a *App) AddTrustedDir(dir string) error {
+	return a.config.AddTrustedDir(dir)
+}